Electronic devices

Abstract

The present application provides an electronic device, which relates to the field of antenna technology. The electronic device includes a composite antenna composed of a slot antenna and a wire antenna. Among them, the first strip conductor of the slot antenna includes a first grounding part, a second grounding part and a feeding part, and the first grounding part and the second grounding part are respectively the two ends of the first strip conductor. The feeding part is located between the first grounding part and the second grounding part. The second strip conductor of the wire antenna includes a first end and a second end. The first end of the second strip conductor is electrically connected to the first grounding part. The second end of the second strip conductor is an open end. The composite antenna composed of the slot antenna and the wire antenna can not only generate multiple resonant modes to achieve broadband coverage, but also ensure that the multiple resonant modes meet the requirements of low SAR values ​​to reduce the impact of electromagnetic wave radiation on the human body.

Description

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on April 27, 2020, with application number 202010346611.7 and application name “Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of antenna technology, and in particular to an electronic device. Background Art

[0003] With the rapid development of key technologies such as full-screen, the trend of electronic devices being thinner and lighter with an extreme screen-to-body ratio has become a trend. This design has greatly compressed the space for antenna arrangement. In this environment where antenna arrangement is tight, it is difficult for traditional antennas to meet the performance requirements of multiple communication bands. In addition, in the design of mobile phone antennas, attention should also be paid to the impact of electromagnetic wave radiation on the human body. The energy absorbed by the human body of electromagnetic waves is quantified by the specific absorption ratio (SAR). A small SAR value means that the impact of electromagnetic radiation on the human body is small. Therefore, how to realize multiple resonant modes on mobile phones while meeting the requirements of low SAR values ​​has become a top priority. Summary of the invention

[0004] The antenna of the electronic device provided by the technical solution of the present application can excite multiple resonance modes, and each resonance mode can meet the requirements of low SAR value.

[0005] The present application provides an electronic device. The electronic device includes a back cover, a circuit board, a bracket, a radio frequency transceiver circuit, a first antenna, and a second antenna. The circuit board and the radio frequency transceiver circuit are located on the same side of the back cover, and the bracket is fixed between the circuit board and the back cover. It is understandable that the bracket can be fixed to the circuit board or to the back cover.

[0006] The first antenna includes a first strip conductor. The first strip conductor is fixed to the bracket. It can be understood that the first strip conductor can be fixed to the surface of the bracket or embedded in the bracket.

[0007] In addition, the first strip conductor includes a first grounding portion, a second grounding portion and a feeding portion. The first grounding portion and the second grounding portion are two ends of the first strip conductor respectively. The first grounding portion and the second grounding portion are both grounded through the circuit board. The feeding portion is located between the first grounding portion and the second grounding portion, and is electrically connected to the radio frequency transceiver circuit. A clearance area of ​​the first antenna is formed between the board surface of the circuit board facing the rear cover and the first strip conductor.

[0008] The second antenna includes a second strip conductor. The second strip conductor is fixed to the back cover or the bracket. It is understandable that the second strip conductor can be fixed to the surface of the back cover or embedded in the back cover. The second strip conductor can be fixed to the surface of the bracket or embedded in the bracket.

[0009] In addition, the second strip conductor includes a first end and a second end disposed away from the first end. The first end of the second strip conductor is electrically connected to the first grounding portion of the first strip conductor. The second end of the second strip conductor is not grounded, that is, the second end of the second strip conductor is an open end. A clearance area of ​​the second antenna is formed between the board surface of the circuit board facing the rear cover and the second strip conductor.

[0010] It can be understood that the first antenna can excite an antenna mode in a differential mode. The current of the differential mode excited by the first antenna is mainly distributed as follows: a first current flowing from the first grounding part to the feeding part on the first strip conductor and a second current flowing from the second grounding part to the feeding part. The first current on the first strip conductor is opposite to the direction of the second current, and the current intensity of the first current and the current intensity of the second current can be roughly the same. At this time, the phase of the magnetic field at the feeding part is opposite, and the amplitude of the magnetic field can be roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part, forming two SAR hotspots on both sides of the feeding part. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the differential mode excited by the first antenna is relatively low.

[0011] In addition, the second antenna can excite an antenna mode in a common mode. The current in the common mode excited by the second antenna is mainly distributed as follows: a third current flows from the second end of the second strip conductor to the first end of the second strip conductor on the second strip conductor. It can be understood that the third current on the second strip conductor can flow into the circuit board through the first grounding portion, so that the current intensity on the second strip conductor can be greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor is also small, and the SAR value of the common mode excited by the second antenna is low.

[0012] In addition, the present implementation method designs a composite antenna of a first antenna and a second antenna so that under feeding, the composite antenna can excite two resonant modes, thereby achieving broadband coverage while also achieving low SAR values ​​for the two modes, and the resonant mode of the first antenna can generate two SAR hotspots.

[0013] In one implementation, the first end of the second strip conductor is directly fed to the first ground portion of the first strip conductor. It can be understood that direct feeding means that the first end of the second strip conductor is connected to the first ground portion of the first strip conductor, and the RF signal is directly fed to the second strip conductor via the first ground portion.

[0014] In one implementation, the first end of the second strip conductor is indirectly coupled to the first grounded portion of the first strip conductor for feeding.

[0015] In one implementation, a distance between the first grounding portion and an end surface of the first strip conductor is in a range of 0 to 5 mm.

[0016] In one implementation, a distance between the first grounding portion and an end surface of the first strip conductor is in a range of 0 to 2.5 mm.

[0017] In one implementation, the distance between the first ground portion and the end surface of the first strip conductor is in the range of 0 to 0.12λ, where λ is the wavelength of the signal radiated by the antenna.

[0018] In one implementation, the distance between the first ground portion and the end surface of the first strip conductor is 0 to 0.06λ, where λ is the wavelength of the signal radiated by the antenna.

[0019] In one implementation, a distance between the second grounding portion and an end surface of the first strip conductor is in a range of 0 to 5 mm.

[0020] In one implementation, a distance between the second grounding portion and an end surface of the first strip conductor is in a range of 0 to 2.5 mm.

[0021] In one implementation, the distance between the second ground portion and the end surface of the first strip conductor is in the range of 0 to 0.12λ, where λ is the wavelength of the signal radiated by the antenna.

[0022] In one implementation, the distance between the second ground portion and the end surface of the first strip conductor is 0 to 0.06λ, where λ is the wavelength of the signal radiated by the antenna.

[0023] In one implementation, the center distance between the feed portion and the first ground portion is a first value, the center distance between the feed portion and the second ground portion is a second value, and the ratio of the first value to the second value is in the range of 0.8 to 1.2.

[0024] It can be understood that when the ratio of the first value to the second value is in the range of 0.8 to 1.2, the overall symmetry of the first strip conductor is better. At this time, in the current distribution of the differential mode excited by the first antenna, the current intensity of the first current on the first strip conductor is approximately the same as the current intensity of the second current. In this way, the phase of the magnetic field at the feeding part is opposite, and the amplitude of the magnetic field is approximately offset. The magnetic field is mainly distributed on both sides of the feeding part. The SAR value of the differential mode excited by the first antenna is relatively low.

[0025] In other possible implementations, the ratio of the first value to the second value may not be within the range of 0.8 to 1.2. The overall symmetry of the first strip conductor is poor. In this case, the matching circuit of the first antenna can be used to compensate for this structural asymmetry, so that in the current distribution of the differential mode excited by the first antenna, the current intensity of the first current on the first strip conductor can be substantially the same as the current intensity of the second current, thereby ensuring that the SAR value of the differential mode excited by the first antenna is relatively low.

[0026] In one implementation, the projection of the first strip conductor on the board surface of the circuit board is the first projection. The projection of the second strip conductor on the board surface of the circuit board is the second projection. The area of ​​the overlapping region of the first projection and the second projection is in the range of 0-16 square millimeters. It can be understood that, under this size, the stability of the electrical connection between the first end of the second strip conductor and the first grounding portion of the first strip conductor is better. At this time, the third current on the second strip conductor can flow into the circuit board through the first grounding portion better, so that the SAR value of the common mode excited by the second antenna is lower.

[0027] In one implementation, the second antenna further includes a third strip conductor. The third strip conductor is fixed to the back cover or the bracket. It is understandable that the third strip conductor can be fixed to the surface of the back cover or embedded in the back cover. The third strip conductor can be fixed to the surface of the bracket or embedded in the bracket.

[0028] The third strip conductor includes a first end and a second end disposed away from the first end. The first end of the third strip conductor is electrically connected to the second grounding portion of the first strip conductor. The second end of the third strip conductor is not grounded, that is, the second end of the third strip conductor is an open end. A clearance area of ​​the second antenna is formed between the board surface of the circuit board facing the rear cover and the third strip conductor.

[0029] It can be understood that by providing the third strip conductor and electrically connecting the first end of the third strip conductor to the second grounding portion, the third strip conductor also excites an antenna mode in a common mode. The current in the common mode is mainly distributed as follows: a fourth current flows from the second end of the third strip conductor to the first end of the third strip conductor on the third strip conductor.

[0030] In one case, when the resonant frequency of the common mode excited by the third strip conductor is not equal to the resonant frequency of the common mode excited by the second strip conductor, the second antenna can excite antenna modes of two common mode modes: the common mode excited by the second strip conductor and the common mode excited by the third strip conductor. Thus, in this implementation, the first antenna and the second antenna can excite three resonant modes, which is conducive to the antenna to achieve broadband coverage setting.

[0031] In addition, for the current distribution in the common mode excited by the third strip conductor, the fourth current on the third strip conductor can flow into the circuit board through the second grounding portion, so that the current intensity on the third strip conductor is greatly weakened. The magnetic field intensity generated by the third strip conductor is also small, and the SAR value of the common mode excited by the second antenna is also low.

[0032] In another case, when the resonant frequency of the common mode excited by the third strip conductor is equal to the resonant frequency of the common mode excited by the second strip conductor, the second antenna excites an antenna mode of a common mode: the second strip conductor and the third strip conductor jointly excite a common mode. Thus, in this implementation, the first antenna and the second antenna can excite two resonant modes, which is conducive to the antenna to achieve a broadband coverage setting.

[0033] In addition, for the common mode current jointly excited by the second strip conductor and the third strip conductor, the third current on the second strip conductor is opposite to the fourth current on the third strip conductor, and the current intensity can be substantially the same. At this time, the phase of the magnetic field at the feeding part is opposite, and the amplitude of the magnetic field is substantially offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part, forming two SAR hotspots on both sides of the feeding part. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of this common mode is low.

[0034] In addition, for the current distribution of the common mode jointly excited by the second strip conductor and the third strip conductor, the third current on the second strip conductor can flow into the circuit board via the first grounding portion, and the fourth current on the third strip conductor can flow into the circuit board via the second grounding portion, so that the current intensity on the second strip conductor and the third strip conductor is greatly weakened. The magnetic field intensity generated by the second strip conductor and the third strip conductor is also small, and the SAR value of the common mode excited by the second antenna is also low.

[0035] In one implementation, the first end of the third strip conductor is directly fed to the second ground portion of the first strip conductor. It can be understood that direct feeding means that the first end of the third strip conductor of the third strip conductor is connected to the second ground portion of the first strip conductor, and the radio frequency signal is directly fed to the second strip conductor via the second ground portion.

[0036] In one implementation, the first end of the third strip conductor is indirectly coupled to the second grounded portion of the first strip conductor for feeding.

[0037] In one implementation, the projection of the first strip conductor on the board surface of the circuit board is the first projection. The projection of the third strip conductor on the board surface of the circuit board is the third projection. The area of ​​the overlapping region of the first projection and the third projection is in the range of 0-16 square millimeters. It can be understood that, under this size, the stability of the electrical connection between the first end of the third strip conductor and the second grounding portion of the first strip conductor is better. At this time, the fourth current on the third strip conductor can flow into the circuit board through the second grounding portion better, so that the SAR value of the common mode excited by the second antenna is lower.

[0038] In one implementation, the projection of the first strip conductor on the board surface of the circuit board is a first projection. The projection of the second strip conductor on the board surface of the circuit board is a second projection. The angle between the second projection and the first projection is a first angle. The first angle is in the range of 90° to 270°. The projection of the third strip conductor on the board surface of the circuit board is a third projection. The angle between the third projection and the first projection is a second angle. The second angle is in the range of 90° to 270°.

[0039] It can be understood that when the first angle is within the range of 90° to 270°, the second end of the second strip conductor is arranged in a direction away from the first strip conductor. At this time, when the first strip conductor and the second strip conductor send and receive electromagnetic wave signals, the first strip conductor and the second strip conductor are not easy to interfere with and affect each other, thereby ensuring that the first antenna and the second antenna have better radiation performance.

[0040] In addition, when the second angle is within the range of 90° to 270°, the second end of the third strip conductor is arranged in a direction away from the first strip conductor. At this time, when the first strip conductor and the third strip conductor send and receive electromagnetic wave signals, the first strip conductor and the third strip conductor are not easy to interfere with and affect each other, thereby ensuring that the first antenna and the second antenna have better radiation performance.

[0041] In one implementation, the first angle and the second angle are both equal to 180°. The length of the second strip conductor is equal to the length of the third strip conductor.

[0042] It can be understood that when the first angle and the second angle are both equal to 180°, and the length of the second strip conductor is equal to the length of the third strip conductor, the second strip conductor and the third strip conductor are symmetrical about the feeding part. At this time, the resonant frequency of the common mode excited by the third strip conductor is equal to the resonant frequency of the common mode excited by the second strip conductor. The second antenna can excite a resonant mode of a common mode mode: the second strip conductor and the third strip conductor jointly excite a common mode mode. In this way, in this implementation, the first antenna and the second antenna excite two antenna modes, which is conducive to the antenna to achieve a broadband coverage setting.

[0043] In addition, for the common mode current excited by the second strip conductor and the third strip conductor, the third current on the second strip conductor is opposite to the fourth current on the third strip conductor, and the current intensity is roughly the same. At this time, the phase of the magnetic field at the feeding part is opposite, and the amplitude of the magnetic field is roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part, forming two SAR hotspots on both sides of the feeding part. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of this common mode is low.

[0044] In one implementation, the first angle and the second angle are both equal to 180°. The length of the second strip conductor is less than the length of the third strip conductor.

[0045] It can be understood that when the first angle and the second angle are both equal to 180°, and the length of the second strip conductor is less than the length of the third strip conductor, the second strip conductor and the third strip conductor are not symmetrical about the feeding part. At this time, the resonant frequency of the common mode mode excited by the third strip conductor is not equal to the resonant frequency of the common mode mode excited by the second strip conductor. The second antenna can excite two common mode resonant modes: the common mode excited by the second strip conductor and the common mode excited by the third strip conductor. In this way, in this implementation, the first antenna and the second antenna can excite three resonant modes, which is conducive to the antenna to achieve a broadband coverage setting.

[0046] In addition, for the current distribution in the common mode excited by the third strip conductor, the fourth current on the third strip conductor flows into the circuit board through the second grounding portion, so that the current intensity on the third strip conductor is greatly weakened. The magnetic field intensity generated by the third strip conductor is also small, and the SAR value of the common mode excited by the second antenna is low.

[0047] In one implementation, the second antenna further includes a third strip conductor. The third strip conductor is fixed to the back cover or the bracket. It is understandable that the third strip conductor can be fixed to the surface of the back cover or embedded in the back cover. The third strip conductor can be fixed to the surface of the bracket or embedded in the bracket.

[0048] The third strip conductor includes a first end and a second end disposed away from the first end. The first end of the third strip conductor is connected to the first end of the second strip conductor. The first end of the third strip conductor is electrically connected to the first grounding portion. The second end of the third strip conductor is not grounded, that is, the second end of the third strip conductor is an open end. A clearance area of ​​the second antenna is formed between the board surface of the circuit board facing the rear cover and the third strip conductor.

[0049] It can be understood that by setting the first end of the third strip conductor to be connected to the first end of the second strip conductor, and by electrically connecting the first end of the third strip conductor to the first grounding portion, the second antenna excites an antenna mode in a common mode: the second strip conductor and the third strip conductor jointly excite an antenna mode in a common mode. In this way, in this implementation, the first antenna and the second antenna can excite two resonant modes, which is conducive to the antenna to achieve a broadband coverage setting.

[0050] In addition, the current of the common mode jointly excited by the second strip conductor and the third strip conductor is mainly distributed as follows: the third current on the second strip conductor flows from the second end of the second strip conductor to the first end of the second strip conductor, and the fourth current on the third strip conductor flows from the second end of the third strip conductor to the first end of the third strip conductor. At this time, the fourth current on the third strip conductor can be opposite to the direction of the third current on the second strip conductor, and the current intensity can be roughly the same. At this time, the amplitude of the magnetic field between the third strip conductor and the second strip conductor can be offset, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the common mode excited by the second antenna is relatively low.

[0051] In addition, the third current on the second strip conductor flows into the circuit board via the first grounding portion, and the current on the third strip conductor flows into the circuit board via the second grounding portion. In this way, the current intensity on the second strip conductor and the third strip conductor is greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor and the third strip conductor is also small, and the SAR value of the common mode mode of the second antenna is further reduced.

[0052] In one implementation, the first end of the third strip conductor is directly fed to the first ground portion of the first strip conductor. It can be understood that direct feeding means that the first end of the third strip conductor is connected to the first ground portion of the first strip conductor, and the RF signal is directly fed to the second strip conductor via the first ground portion.

[0053] In one implementation, the first end of the third strip conductor is indirectly coupled to the first grounded portion of the first strip conductor for feeding.

[0054] In one implementation, the projection of the first strip conductor on the surface of the circuit board is the first projection. The projection of the second strip conductor on the surface of the circuit board is the second projection. The projection of the third strip conductor on the surface of the circuit board is the third projection. The area of ​​the overlapping region of the first projection, the second projection and the third projection is in the range of 0-16 square millimeters. It can be understood that, at this size, the stability of the electrical connection between the first end of the second strip conductor and the first grounding portion of the first strip conductor is better. The stability of the electrical connection between the first end of the third strip conductor and the first grounding portion of the first strip conductor is better. At this time, the third current on the second strip conductor can flow into the circuit board better through the first grounding portion, and the fourth current on the third strip conductor can flow into the circuit board better through the first grounding portion, so that the SAR value of the common mode excited by the second antenna is lower.

[0055] In one implementation, a projection of the first strip conductor on the board surface of the circuit board is a first projection. A projection of the second strip conductor on the board surface of the circuit board is a second projection. An angle between the second projection and the first projection is a first angle. A projection of the third strip conductor on the board surface of the circuit board is a third projection. An angle between the third projection and the first projection is a second angle. Both the first angle and the second angle are equal to 90°.

[0056] It can be understood that when the first angle is equal to 90°, the second end of the second strip conductor is arranged in a direction away from the first strip conductor. At this time, when the first strip conductor and the second strip conductor send and receive electromagnetic wave signals, the first strip conductor and the second strip conductor are not easy to interfere with and affect each other, thereby ensuring that the first antenna and the second antenna have better radiation performance.

[0057] In addition, when the second angle is equal to 90°, the second end of the third strip conductor of the third strip conductor is arranged in a direction away from the first strip conductor. At this time, when the first strip conductor and the third strip conductor send and receive electromagnetic wave signals, the first strip conductor and the third strip conductor are not easy to interfere with and affect each other, thereby ensuring that the first antenna and the second antenna have better radiation performance.

[0058] In addition, when the first angle and the second angle are equal to 90°, for the current in the common mode excited by the second strip conductor and the third strip conductor, the current directions on the first strip conductor and the third strip conductor are opposite. At this time, the amplitude of the magnetic field between the third strip conductor and the second strip conductor can be offset, the energy of the radiated electromagnetic wave is more dispersed, and the SAR value of the common mode excited by the second antenna is reduced.

[0059] In one implementation, the length of the second strip conductor is equal to the length of the third strip conductor. At this time, the second strip conductor and the third strip conductor are symmetrical about the first grounding portion. At this time, for the current of the common mode jointly excited by the second strip conductor and the third strip conductor, the current intensity on the first strip conductor and the third strip conductor is the same. At this time, the amplitude of the magnetic field between the third strip conductor and the second strip conductor is offset, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the common mode excited by the second antenna is reduced.

[0060] In one implementation, the second antenna further includes a fourth strip conductor and a fifth strip conductor. The fourth strip conductor and the fifth strip conductor are both fixed to the back cover or the bracket. It is understandable that the fourth strip conductor and the fifth strip conductor can be fixed to the surface of the back cover or embedded in the back cover. The fourth strip conductor and the fifth strip conductor can be fixed to the surface of the bracket or embedded in the bracket.

[0061] In addition, a clearance area of ​​the second antenna is formed between the surface of the circuit board facing the rear cover and the fourth strip conductor. A clearance area of ​​the second antenna is formed between the surface of the circuit board facing the rear cover and the fifth strip conductor.

[0062] One end of the fourth strip conductor is connected to one end of the fifth strip conductor. The connecting ends of the fourth strip conductor and the fifth strip conductor are electrically connected to the second grounding portion. One end of the fourth strip conductor away from the fifth strip conductor and one end of the fifth strip conductor away from the fourth strip conductor are not grounded, that is, one end of the fourth strip conductor away from the fifth strip conductor and one end of the fifth strip conductor away from the fourth strip conductor are both open ends.

[0063] It can be understood that by providing the fourth strip conductor and the fifth strip conductor, and electrically connecting the connecting end of the fourth strip conductor and the fifth strip conductor to the second grounding portion, the fourth strip conductor and the fifth strip conductor jointly excite an antenna mode of a common mode. The current of the common mode is mainly distributed as follows: a fifth current flowing from the second end of the fourth strip conductor to the first end of the fourth strip conductor on the fourth strip conductor, and a sixth current flowing from the second end of the fifth strip conductor to the first end of the fifth strip conductor in the fifth strip conductor.

[0064] In one case, when the resonant frequency of the common mode jointly excited by the fourth strip conductor and the fifth strip conductor is not equal to the resonant frequency of the common mode jointly excited by the second strip conductor and the third strip conductor, the second antenna can excite the resonant modes of two common mode modes: the common mode jointly excited by the second strip conductor and the third strip conductor, and the common mode jointly excited by the fourth strip conductor and the fifth strip conductor. In this way, in this implementation, the first antenna and the second antenna can excite three resonant modes, which is conducive to the antenna to achieve broadband coverage setting.

[0065] In addition, for the current distribution of the common mode excited by the fourth strip conductor and the fifth strip conductor, the fifth current on the fourth strip conductor flows into the circuit board through the second grounding portion, and the sixth current on the sixth strip conductor flows into the circuit board through the second grounding portion, so that the current intensity on the fourth strip conductor and the fifth strip conductor is greatly weakened. The magnetic field intensity generated by the fourth strip conductor and the fifth strip conductor is also small, and the SAR value of the common mode excited by the second antenna is low.

[0066] In another case, when the resonance frequency of the common mode jointly excited by the fourth strip conductor and the fifth strip conductor is equal to the resonance frequency of the common mode jointly excited by the second strip conductor and the third strip conductor, the second antenna can excite a resonance mode of the common mode: the second strip conductor, the third strip conductor, the fourth strip conductor and the fifth strip conductor jointly excite a common mode. In this way, in this implementation, the first antenna and the second antenna can excite two resonance modes, which is conducive to the antenna to achieve broadband coverage setting.

[0067] In addition, for the common mode current jointly excited by the second strip conductor, the third strip conductor, the fourth strip conductor and the fifth strip conductor, the third current on the second strip conductor can be opposite to the fourth current of the third strip conductor, and the current intensity can be approximately the same, and the fifth current on the fourth strip conductor can be opposite to the sixth current of the fifth strip conductor, and the current intensity can be approximately the same. At this time, the phase of the magnetic field at the feeding part is opposite, and the amplitude of the magnetic field is approximately offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part, forming two SAR hotspots on both sides of the feeding part. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of this common mode is low.

[0068] In one implementation, a connection end between the fourth strip conductor and the fifth strip conductor is directly fed to the second grounding portion.

[0069] In one implementation, the connection end of the fourth strip conductor and the fifth strip conductor is indirectly coupled to the second grounding portion for feeding.

[0070] In one implementation, the projection of the first strip conductor on the board surface of the circuit board is the first projection. The projection of the fourth strip conductor on the board surface of the circuit board is the fourth projection. The projection of the fifth strip conductor on the board surface of the circuit board is the fifth projection. The area of ​​the overlapping region of the first projection, the fourth projection and the fifth projection is in the range of 0-16 square millimeters. It can be understood that, under this size, the stability of the electrical connection between the first end of the fourth strip conductor and the second grounding portion of the first strip conductor is better. The stability of the electrical connection between the first end of the fifth strip conductor and the second grounding portion of the first strip conductor is better. At this time, the fifth current on the fourth strip conductor can flow into the circuit board better through the second grounding portion, and the sixth current on the fifth strip conductor can flow into the circuit board better through the second grounding portion, so that the SAR value of the common mode excited by the second antenna is lower.

[0071] In one implementation, the projection of the fourth strip conductor on the board surface of the circuit board is a fourth projection. The angle between the fourth projection and the first projection is equal to 90°. The projection of the fifth strip conductor on the board surface of the circuit board is a fifth projection. The angle between the fifth projection and the first projection is equal to 90°.

[0072] It can be understood that when the angle between the fourth projection and the first projection is equal to 90°, the second end of the fourth strip conductor of the fourth strip conductor is arranged in a direction away from the first strip conductor. At this time, when the fourth strip conductor sends and receives electromagnetic wave signals, the fourth strip conductor and the first strip conductor are not easy to interfere with and affect each other, thereby ensuring that the first antenna and the second antenna have better radiation performance.

[0073] In addition, when the angle between the fifth projection and the first projection is equal to 90°, the second end of the fifth strip conductor of the fifth strip conductor is arranged in a direction away from the first strip conductor. At this time, when the fifth strip conductor sends and receives electromagnetic wave signals, the fifth strip conductor and the first strip conductor are not easy to interfere with and affect each other, thereby ensuring that the first antenna and the second antenna have better radiation performance.

[0074] In addition, when the angle between the fourth projection and the first projection, and the angle between the fifth projection and the first projection are both equal to 90°, for the current distribution of the common mode jointly excited by the fourth strip conductor and the fifth strip conductor, the current directions on the fourth strip conductor and the fifth strip conductor are opposite. At this time, the amplitude of the magnetic field between the fourth strip conductor and the fifth strip conductor can be offset, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the common mode excited by the second antenna is reduced.

[0075] In one implementation, the sum of the length of the fourth strip conductor and the length of the fifth strip conductor is equal to the sum of the length of the second strip conductor and the third strip conductor.

[0076] It can be understood that when the sum of the length of the fourth strip conductor and the length of the fifth strip conductor is equal to the sum of the length of the second strip conductor and the third strip conductor, the second strip conductor and the third strip conductor can be symmetrical with the fourth strip conductor and the fifth strip conductor about the feeding part. At this time, the resonant frequency of the common mode jointly excited by the fourth strip conductor and the fifth strip conductor is equal to the resonant frequency of the common mode jointly excited by the second strip conductor and the third strip conductor, and the second antenna can excite a resonant mode of the common mode mode: the second strip conductor, the third strip conductor, the fourth strip conductor and the fifth strip conductor jointly excite a common mode mode. In this way, in this implementation, the first antenna and the second antenna can excite two resonant modes, which is conducive to the antenna to achieve a broadband coverage setting.

[0077] In addition, for the common mode current jointly excited by the second strip conductor, the third strip conductor, the fourth strip conductor and the fifth strip conductor, the current intensity of the third current on the second strip conductor can be the same as the current intensity of the fourth current on the third strip conductor, and the current intensity of the fifth current on the fourth strip conductor can be the same as the current intensity of the sixth current on the fifth strip conductor. At this time, the phase of the magnetic field at the feeding part is opposite, and the amplitude of the magnetic field is roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part, forming two SAR hotspots on both sides of the feeding part. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of this common mode is low.

[0078] In one implementation, the sum of the length of the fourth strip conductor and the length of the fifth strip conductor is less than the sum of the length of the second strip conductor and the third strip conductor.

[0079] It can be understood that the second strip conductor and the third strip conductor are not symmetrical with the fourth strip conductor and the fifth strip conductor about the feeding part. The resonant frequency of the common mode jointly excited by the fourth strip conductor and the fifth strip conductor is not equal to the resonant frequency of the common mode jointly excited by the second strip conductor and the third strip conductor. The second antenna can excite the resonant mode of two common mode modes: the common mode jointly excited by the second strip conductor and the third strip conductor, and the common mode jointly excited by the fourth strip conductor and the fifth strip conductor. In this way, in this implementation, the first antenna and the second antenna can excite three resonant modes, which is conducive to the antenna to achieve a broadband coverage setting.

[0080] In addition, for the current distribution of the common mode excited by the fourth strip conductor and the fifth strip conductor, the fifth current on the fourth strip conductor flows into the circuit board through the second grounding part, and the sixth current on the sixth strip conductor flows into the circuit board through the second grounding part, so that the current intensity on the fourth strip conductor and the fifth strip conductor is greatly weakened. The magnetic field intensity generated by the fourth strip conductor and the fifth strip conductor is also small, and the SAR value of the common mode excited by the second antenna is low.

[0081] In one implementation, the first antenna and the second antenna generate multiple resonance modes, and the resonance mode of the first antenna generates two SAR hot spots.

[0082] In one implementation, a SAR value of the resonant mode of the first antenna is less than 0.5.

[0083] In one implementation, the first antenna and the second antenna generate multiple resonance modes, and the SAR value of each resonance mode is less than 1.

[0084] In one implementation, the current excited by the first strip conductor includes a first current flowing from the first grounding portion to the feeding portion, and a second current flowing from the second grounding portion to the feeding portion.

[0085] In one implementation, the current excited by the second strip conductor includes a current flowing from the second end of the second strip conductor to the first end of the second strip conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 It is a structural schematic diagram of an implementation mode of an electronic device provided in an embodiment of the present application;

[0087] Figure 2 yes Figure 1 a partially exploded schematic diagram of the electronic device shown;

[0088] Figure 3 yes Figure 1 A partial cross-sectional view of the electronic device shown at line MM;

[0089] Figure 4a A schematic diagram of the structure of the slot antenna provided by the present application is shown;

[0090] Figure 4b shows a current distribution diagram of the differential mode of the slot antenna provided by the present application;

[0091] Figure 5a A schematic diagram of the structure of the wire antenna provided by the present application is shown;

[0092] Figure 5b shows a current distribution diagram of the common mode mode of the wire antenna provided by the present application;

[0093] Figure 6 yes Figure 1 A schematic diagram of a portion of the structure of the electronic device shown;

[0094] Figure 7 yes Figure 1 A partial cross-sectional schematic diagram of an embodiment of the electronic device shown at line NN;

[0095] Figure 8 yes Figure 1 A partial structural schematic diagram of an embodiment of a composite antenna of an electronic device shown;

[0096] Figure 9a yes Figure 1 A partial structural schematic diagram of another embodiment of a composite antenna of an electronic device shown;

[0097] Figure 9b yes Figure 1 A schematic structural diagram of a back cover, a second strip conductor and a third strip conductor of an electronic device shown;

[0098] Fig.10 yes Figure 7 A schematic projection diagram of an implementation manner of the first strip conductor, the second strip conductor and the third strip conductor on a circuit board is shown;

[0099] Fig.11a yes Figure 8 The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0100] Fig.11b yes Figure 8 The schematic diagram of the current flow of the composite antenna shown in resonance "1";

[0101] Fig.11c yes Figure 8 The schematic diagram of the current flow of the composite antenna shown in resonance "2";

[0102] Fig.11d yes Figure 8 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "1";

[0103] Fig.11e yes Figure 8 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "2";

[0104] Fig.11f yes Figure 7 A schematic projection diagram of another implementation of the first strip conductor, the second strip conductor and the third strip conductor on the circuit board is shown;

[0105] Figure 11g yes Fig.11f The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0106] Fig.11h yes Figure 7 A schematic projection diagram of another embodiment of the first strip conductor, the second strip conductor and the third strip conductor on the circuit board is shown;

[0107] Fig.11i yes Fig.11h The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0108] Fig.12 yes Figure 1 A partial structural schematic diagram of another embodiment of a composite antenna of an electronic device shown;

[0109] Fig.13 yes Figure 1 A partial cross-sectional schematic diagram of another embodiment of the electronic device shown along line NN;

[0110] Fig.14a yes Fig.12 The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0111] Fig.14b yes Fig.12 The schematic diagram of the current flow of the composite antenna shown in resonance "1";

[0112] Fig.14c yes Fig.12 The schematic diagram of the current flow of the antenna shown in resonance "2";

[0113] Fig.14d yes Fig.12 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "1";

[0114] Fig.14e yes Fig.12 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "2";

[0115] Fig.15 yes Figure 1 A partial structural schematic diagram of another embodiment of a composite antenna of an electronic device shown;

[0116] Fig.16a yes Fig.15 The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0117] Fig.16b yes Fig.15 The schematic diagram of the current flow of the composite antenna shown in resonance "1";

[0118] Fig.16c yes Fig.15 The schematic diagram of the current flow of the antenna shown in resonance "2";

[0119] Fig.16d yes Fig.15 The schematic diagram of the current flow of the composite antenna shown in resonance "3";

[0120] Fig.16e yes Fig.15 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "1";

[0121] Fig.16f yes Fig.15 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "2";

[0122] Figure 16g yes Fig.15 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "3";

[0123] Fig.17 yes Figure 1 A partial structural schematic diagram of another embodiment of a composite antenna of an electronic device shown;

[0124] Fig.18a yes Fig.17 The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0125] Fig.18b yes Fig.17 The schematic diagram of the current flow of the composite antenna shown in resonance "1";

[0126] Fig.18c yes Fig.17 The schematic diagram of the current flow of the antenna shown in resonance "2";

[0127] Fig.18d yes Fig.17 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "1";

[0128] Fig.18e yes Fig.17 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "2";

[0129] Fig.19 yes Figure 1 A partial structural schematic diagram of another embodiment of a composite antenna of an electronic device shown;

[0130] Fig. 20 yes Fig.19 A schematic diagram of the structure of the composite antenna shown at another angle;

[0131] Fig.21 yes Fig.19 A schematic diagram of projections of the first strip conductor, the second strip conductor and the third strip conductor on the circuit board is shown;

[0132] Fig.22a yes Fig.19 The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0133] Figure 22b yes Fig.19 The schematic diagram of the current flow of the composite antenna shown in resonance "1";

[0134] Fig.22c yes Fig.19 The schematic diagram of the current flow of the antenna shown in resonance "2";

[0135] Fig.22d yes Fig.19 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "1";

[0136] Fig.22e yes Fig.19 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "2";

[0137] Fig.23 yes Figure 1 A partial structural schematic diagram of another embodiment of a composite antenna of an electronic device shown;

[0138] Fig.24 yes Fig.23 A schematic diagram of the structure of the composite antenna shown at another angle;

[0139] Fig.25 yes Fig.23 A schematic diagram of projections of the first strip conductor, the second strip conductor and the third strip conductor on the circuit board is shown;

[0140] Fig.26a yes Fig.23 The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0141] Figure 26b yes Fig.23 The schematic diagram of the current flow of the composite antenna shown in resonance "1";

[0142] Fig.26c yes Fig.23 The schematic diagram of the current flow of the antenna shown in resonance "2";

[0143] Fig.26d yes Fig.23 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "1";

[0144] Fig.26e yes Fig.23Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "2";

[0145] Fig. 27 yes Figure 1 A partial structural schematic diagram of another embodiment of a composite antenna of an electronic device shown;

[0146] Fig.28a yes Fig. 27 The relationship between the reflection coefficient and the frequency of the composite antenna shown in the frequency band of 3 to 6 GHz;

[0147] Fig.28b yes Fig. 27 The schematic diagram of the current flow of the composite antenna shown in resonance "1";

[0148] Fig.28c yes Fig. 27 The schematic diagram of the current flow of the antenna shown in resonance "2";

[0149] Fig.28d yes Fig. 27 Schematic diagram of the current flow of the composite antenna at resonance "3"

[0150] Fig.28e yes Fig. 27 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "1";

[0151] Figure 28f yes Fig. 27 Schematic diagram of SAR hotspot distribution of the composite antenna shown at resonance "2";

[0152] Figure 28g yes Fig. 27 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “3” is shown. DETAILED DESCRIPTION

[0153] See also Figure 1 , Figure 1 1 is a schematic diagram of an implementation of an electronic device provided in an embodiment of the present application. The electronic device 100 may be a mobile phone, a watch, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a camera, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, an augmented reality (AR) glasses, an AR helmet, a virtual reality (VR) glasses, a VR helmet, or other devices capable of receiving and transmitting electromagnetic waves. Figure 1The electronic device 100 of the illustrated embodiment is described by taking a mobile phone as an example. For ease of description, the width direction of the electronic device 100 is defined as the X axis. The length direction of the electronic device 100 is defined as the Y axis. The thickness direction of the electronic device 100 is defined as the Z axis.

[0154] See also Figure 2 , and combined with Figure 1 As shown, Figure 2 yes Figure 1 The electronic device 100 includes a housing 10, a screen 20 and a circuit board 30. It is understood that Figure 1 and Figure 2 Only some components of the electronic device 100 are schematically shown, and the actual shapes, sizes and structures of these components are not limited to the following. Figure 1 and Figure 2 limited.

[0155] The housing 10 can be used to support the screen 20 and related components of the electronic device 100. The housing 10 includes a back cover 11 and a frame 12. The back cover 11 and the screen 20 are arranged opposite to each other. The back cover 11 and the screen 20 are installed on opposite sides of the frame 12. At this time, the back cover 11, the frame 12 and the screen 20 together enclose the interior of the electronic device 100. The interior of the electronic device 100 can be used to place electronic components of the electronic device 100, such as a battery, a speaker, a microphone or a receiver.

[0156] In one embodiment, the back cover 11 can be fixedly connected to the frame 12 by adhesive.

[0157] In another embodiment, the back cover 11 and the frame 12 are an integrally formed structure, that is, the back cover 11 and the frame 12 are a whole.

[0158] The screen 20 is mounted on the housing 10. Figure 1 As shown, attached Figure 1 The screen 20 and the housing 10 are shown to form a substantially rectangular parallelepiped structure. In addition, the screen 20 can be used to display images, texts, and the like.

[0159] In this embodiment, the screen 20 includes a protective cover 21 and a display screen 22. The protective cover 21 is stacked on the display screen 22. The protective cover 21 can be set close to the display screen 22, and can be mainly used to protect the display screen 22 from dust. The material of the protective cover 21 can be but not limited to glass. The display screen 22 can be an organic light emitting diode (OLED) display screen, an active matrix organic light emitting diode or an active matrix organic light emitting diode (AMOLED) display screen, a mini organic light emitting diode (mini organic light emitting diode) display screen, a micro organic light emitting diode (micro organic light emitting diode) display screen, a micro organic light emitting diode (micro organic light emitting diode) display screen, and a quantum dot light emitting diode (quantum dot light emitting diodes, QLED) display screen.

[0160] See also Figure 3 , and combined with Figure 2 As shown, Figure 3 yes Figure 1 The circuit board 30 is installed inside the electronic device 100 , and the circuit board 30 is spaced apart from the back cover 11 , that is, there is a space between the circuit board 30 and the back cover 11 .

[0161] In this embodiment, the housing 10 further includes a middle plate 13. The middle plate 13 is located inside the electronic device 100, and the middle plate 13 is connected to the inner side of the frame 12. The circuit board 30 and the display screen 22 of the screen 20 are respectively fixed on opposite sides of the middle plate 13. The circuit board 30 faces the rear cover 11. At this time, the middle plate 13 can be used to support both the screen 20 and the circuit board 30.

[0162] In other embodiments, the housing 10 may not include the middle plate 13 . In this case, the circuit board 30 may be directly fixed on the screen 20 .

[0163] In addition, the circuit board 30 can be used to install electronic components of the electronic device 100. For example, a central processing unit (CPU), a battery management unit, and a baseband processing unit. In addition, the circuit board 30 can be a hard circuit board, a flexible circuit board, or a combination of hard and soft circuit boards. The circuit board 30 can use a FR-4 dielectric board, a Rogers dielectric board, a mixed dielectric board of Rogers and FR-4, and so on. Here, FR-4 is a code for a flame retardant material grade, and the Rogers dielectric board is a high-frequency board.

[0164] In addition, the electronic device 100 also includes multiple antennas. In the present application, "multiple" means at least two. The antenna is used to transmit and receive electromagnetic wave signals. It is understandable that the electronic device 100 can communicate with a network or other devices through an antenna using one or more of the following communication technologies. Among them, the communication technology includes Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (Wi-Fi) communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology, SUB-6G communication technology and other future communication technologies.

[0165] In addition, the electronic device 100 can share mobile data traffic or wireless network with other devices (e.g., mobile phones, watches, tablet computers, or other devices that can transmit and receive electromagnetic wave signals) through antennas. For example, when other devices turn on the data traffic sharing network, the electronic device 100 can access the data traffic sharing network of other devices by receiving the antenna signal of other devices. In this way, the user experience of the electronic device 100 will not be affected by insufficient traffic or the traffic has stopped being used.

[0166] In addition, in order to bring a more comfortable visual experience to the user, the electronic device 100 can adopt a full-screen industrial design (industry design, ID). Full screen means a very large screen-to-body ratio (usually above 90%). The width of the border 12 of the full screen is greatly reduced, and it is necessary to rearrange the internal components of the electronic device 100, such as the front camera, receiver, fingerprint reader, antenna, etc. Especially for antenna design, the clearance area is reduced and the antenna space is further compressed. The size, bandwidth, and efficiency of the antenna are interrelated and influence each other. Reducing the size (space) of the antenna will inevitably reduce the efficiency-bandwidth product of the antenna. Furthermore, in the design of mobile phone antennas, attention should also be paid to the impact of electromagnetic wave radiation on the human body. The more energy the electromagnetic wave absorbs by the human body, the greater the impact of electromagnetic radiation on the human body.

[0167] In the present application, a composite antenna consisting of a slot antenna and a wire antenna is provided so that in an environment where antenna arrangement is tight, the composite antenna of the electronic device 100 can not only generate multiple resonant modes to achieve wideband coverage, but also ensure that the multiple resonant modes meet the requirements of low SAR values ​​to reduce the impact of electromagnetic wave radiation on the human body.

[0168] First, it is introduced that this application involves two antenna modes.

[0169] 1. Slot antenna differential mode (DM) mode

[0170] like Figure 4a As shown, Figure 4a The schematic diagram of the structure of the slot antenna provided by the present application is shown. The slot antenna may include: a first strip conductor 41 and a circuit board 30. The first strip conductor 41 is spaced apart from the circuit board 30. The board surface 33 of the circuit board 30 and the surface 411 of the first strip conductor 41 facing the circuit board 30 form a first gap 42. The two ends of the first strip conductor 41 are respectively electrically connected to the grounding layer of the circuit board 30, and the two ends of the first strip conductor 41 form a first grounding portion B and a second grounding portion C respectively. The first strip conductor 41 includes a feeding portion A. The feeding portion A is located between the first grounding portion B and the second grounding portion C. Among them, the feeding portion A is the portion of the first strip conductor 41 into which the signal is fed. Figure 4a The arrows indicate the location where the RF signal is fed into.

[0171] See also Figure 4b , Figure 4b The current distribution diagram of the differential mode of the slot antenna provided by the present application is shown. Figure 4b The current distribution of the slot antenna is shown in Figure 2. Figure 4bAs shown, the current is distributed in opposite directions on both sides of the feeding portion A of the first strip conductor 41 . Figure 4a The feeding structure shown in FIG. 4 can be called a symmetrical feeding structure. Figure 4b The slot antenna mode shown may be referred to as a slot antenna differential mode mode. Figure 4b The current distribution shown is called the current in the differential mode of the slot antenna.

[0172] 2. Common mode (CM) mode of wire antenna

[0173] like Figure 5a As shown, Figure 5a The schematic diagram of the structure of the linear antenna provided by the present application is shown. The linear antenna may include a second strip conductor 51 and a circuit board 30. The second strip conductor 42 is spaced apart from the circuit board 30. The board surface 33 of the circuit board 30 and the surface 519 of the second strip conductor 51 facing the circuit board 30 form a second gap 31. The middle part of the second strip conductor 51 forms a feeding part A. The feeding part A is the part of the second strip conductor 51 into which the radio frequency signal is fed. Figure 5a Arrows indicate the positions where the radio frequency signal is fed in. In addition, both ends of the second strip conductor 51 are open ends, that is, both ends of the second strip conductor 51 are not grounded.

[0174] like Figure 5b As shown, Figure 5b The current distribution diagram of the common mode of the linear antenna provided by the present application is shown in FIG. The current is distributed in opposite directions on both sides of the feeding portion A of the second strip conductor 51 . Figure 5a The feeding structure shown in FIG. 4 can be called a symmetrical feeding structure. Figure 5b This wire antenna mode shown may be referred to as a wire antenna common mode mode. Figure 5b The current distribution shown is called the common mode current of the wire antenna.

[0175] It is understandable that there are many ways to set up the composite antenna composed of the slot antenna and the linear antenna. The following will specifically introduce several ways to set up the composite antenna composed of the slot antenna and the linear antenna in conjunction with the relevant drawings.

[0176] The first implementation mode first introduces the specific structure of the slot antenna in conjunction with the relevant drawings:

[0177] See also Figure 6 and Figure 7 As shown, Figure 6 yes Figure 1 A schematic diagram of a partial structure of an electronic device shown. Figure 7 yes Figure 1 The electronic device shown is a partial cross-sectional schematic diagram of an embodiment of the electronic device at line NN. Figure 6 Also indicated Figure 1The NN line shown, that is, Figure 7 The electronic device 100 includes a first strip conductor 41. The material of the first strip conductor 41 may be, but is not limited to, copper, gold, silver or graphene. The first strip conductor 41 is a radiator of the slot antenna, that is, the first strip conductor 41 can radiate electromagnetic wave signals according to radio frequency signals. In addition, the first strip conductor 41 can also receive electromagnetic wave signals and convert the electromagnetic wave signals into radio frequency signals. Figure 6 and Figure 7 It is illustrated that the first strip conductor 41 extends along the direction of the Y axis. In other embodiments, the first strip conductor 41 may also extend along the direction of the X axis. Specifically, this embodiment does not limit this.

[0178] In addition, the first strip conductor 41 is located between the rear cover 11 and the circuit board 30, or is fixed to the rear cover 11. Figure 7 The first strip conductor 41 is shown to be located between the back cover 11 and the circuit board 30. At this time, there is a height difference between the first strip conductor 41 and the circuit board 30 in the Z-axis direction. In the Z-axis direction, a first gap 42 is formed between the first strip conductor 41 and the circuit board 30. The first gap 42 is the clearance area of ​​the slot antenna. Figure 7 It is also shown that the circuit board 30 is fixed to the side of the middle plate 13 facing away from the display screen 22 of the screen 20 .

[0179] It is understandable that there are many ways to form and position the first strip conductor 41:

[0180] Please refer again Figure 6 and Figure 7 As shown, the electronic device 100 also includes a bracket 50. The bracket 50 is made of insulating material. The bracket 50 is a frame-shaped structure. The bracket 50 is fixed to the side of the circuit board 30 facing the back cover 11, and the bracket 50 and the circuit board 30 enclose a hollow area. At this time, a first strip conductor 41 is formed on the surface of the bracket 50 facing the back cover 11 by laser direct structuring (LDS). At this time, the first strip conductor 41 is located between the bracket 50 and the back cover 11. In each subsequent embodiment, this embodiment is taken as an example for description.

[0181] In another embodiment, the first strip conductor 41 is formed on the surface of the bracket 50 facing the rear cover 11 by printing direct molding technology.

[0182] In another embodiment, the first strip conductor 41 is formed on the surface of the bracket 50 facing the circuit board 30 by LDS or printing direct forming technology. At this time, the first strip conductor 41 is located in the hollow area surrounded by the bracket 50 and the circuit board 30.

[0183] In another embodiment, the first strip conductor 41 is injection-molded inside the bracket 50 by an in-mold injection molding process.

[0184] In another embodiment, the material of the bracket 50 may also be partially insulating material and partially metal material. Part of the insulating material forms the insulating portion. Part of the metal material forms the metal portion. In this case, the first strip conductor 41 is formed on the insulating portion of the bracket 50. The specific formation method can refer to the above embodiments.

[0185] In one embodiment, the bracket 50 may also be in a plate or block shape. In this case, the bracket 50 no longer encloses a hollow area with the circuit board 30. The bracket 50 is made of insulating material. The first strip conductor 41 is fixed to the surface of the bracket 50 facing the rear cover 11.

[0186] In one embodiment, the electronic device 100 may not include the bracket 50. In this case, the first strip conductor 41 may be fixed to the back cover 11. For example, the first strip conductor 41 is fixed to the surface of the back cover 11 facing the circuit board 30, or the first strip conductor 41 is embedded in the back cover 11, or fixed to the surface of the back cover 11 facing away from the circuit board 30.

[0187] Please refer again Figure 7 The first strip conductor 41 includes a feeding portion A. It is understood that the feeding portion A refers to the portion of the first strip conductor 41 into which the RF signal is fed. The electronic device 100 further includes a first spring 43. The first spring is fixed to the circuit board 30, and the first spring elastically contacts the first strip conductor 41. The portion of the first strip conductor 41 that contacts the first spring 43 is the feeding portion A. It is understood that the attached Figure 7 The feed portion A is shown schematically only. However, the actual shape, size and configuration of the feed portion A are not limited to Figure 7 And the following figures limit.

[0188] In addition, the electronic device 100 further includes a radio frequency transceiver circuit 46. It is understood that Figure 7 The RF transceiver circuit 46 is only schematically shown, and the actual shape, actual size and actual structure of the RF transceiver circuit 46 are not limited to the following. Figure 7 The RF transceiver circuit 46 is mounted on the circuit board 30. The RF transceiver circuit 46 is electrically connected to the first spring 43. In this way, when the RF transceiver circuit 46 transmits a RF signal, the RF signal is transmitted to the first strip conductor 41 through the first spring 43. The first strip conductor 41 radiates an electromagnetic wave signal according to the RF signal. In addition, after the first strip conductor 41 converts the received electromagnetic wave signal into a RF signal, the RF signal is transmitted to the RF transceiver circuit 46 through the first spring 43.

[0189] In one embodiment, the RF transceiver circuit 46 includes a RF transceiver chip (not shown) and a first matching circuit (not shown). The RF transceiver chip, the first matching circuit, and the first spring 43 are electrically connected in sequence. In other words, the first matching circuit is electrically connected between the RF transceiver chip and the first spring 43. The RF transceiver chip is used to transmit and receive RF signals. The first matching circuit can be used to adjust the frequency band of the slot antenna to receive and transmit electromagnetic waves, or for impedance matching of the slot antenna. The first matching circuit includes electronic devices such as antenna switches, capacitors, inductors, or resistors.

[0190] In other embodiments, the RF transceiver circuit 46 can also be electrically connected to the first strip conductor 41 through the first electrical connector, that is, the first spring 43 is replaced by the first electrical connector. In this case, the portion of the first strip conductor 41 that contacts the first electrical connector is the feeding portion A.

[0191] Please refer again Figure 7 , the first strip conductor 41 includes a first grounding portion B and a second grounding portion C. The first grounding portion B and the second grounding portion C are respectively located on both sides of the feeding portion A, and the first grounding portion B and the second grounding portion C are respectively the two ends of the first strip conductor 41. The first grounding portion B and the second grounding portion C refer to the grounding portions of the first strip conductor 41. It is understandable that the first grounding portion B and the second grounding portion C can also be swapped. In other words, the first grounding portion B can also be located on the right side of the feeding portion A. The second grounding portion C can also be located on the left side of the feeding portion A. It is understandable that the attached Figure 7 The first grounding portion B and the second grounding portion C are only schematically shown. However, the actual shape, size and structure of the first grounding portion B and the second grounding portion C are not limited. Figure 7 And the following figures limit.

[0192] Please refer again Figure 7 , the electronic device 100 further includes a second spring piece 44 and a third spring piece 45. The second spring piece 44 and the third spring piece 45 are both fixed to the circuit board 30. The second spring piece 44 and the third spring piece 45 are both elastically in contact with the first strip conductor 41. In addition, the second spring piece 44 and the third spring piece 45 are both electrically connected to the ground layer of the circuit board 30. In this case, the portion of the first strip conductor 41 in contact with the second spring piece 44 is the first grounding portion B. The portion of the first strip conductor 41 in contact with the third spring piece 45 is the second grounding portion C.

[0193] In other embodiments, the electronic device 100 further includes a second matching circuit (not shown). The second matching circuit is electrically connected between the second spring 44 and the ground layer of the circuit board 30. The second matching circuit includes an inductor, a capacitor, a resistor or an antenna switch. The second matching circuit is used to tune the frequency band of the slot antenna to receive and transmit electromagnetic wave signals. The second matching circuit can also be used for impedance matching of the antenna.

[0194] In addition, the circuit board 30 also includes a third matching circuit. The third matching circuit is electrically connected between the third spring piece 45 and the ground layer of the circuit board 30. The third matching circuit includes an inductor, a capacitor, a resistor or an antenna switch. The third matching circuit is used to tune the frequency band of the slot antenna to receive and transmit electromagnetic wave signals. The third matching circuit can also be used for impedance matching of the antenna.

[0195] In other embodiments, the first strip conductor 41 may also be grounded through the second electrical connector and the third electrical connector. In this case, the portion of the first strip conductor 41 contacting the second electrical connector is the first grounding portion B. The portion of the first strip conductor 41 contacting the third electrical connector is the second grounding portion C.

[0196] See also Figure 8 , Figure 8 yes Figure 1 A partial structural diagram of an embodiment of a composite antenna of an electronic device shown in FIG. The center distance between the first ground portion B and the feed portion A is a first value d1. It can be understood that the center distance between the first ground portion B and the feed portion A refers to the distance between the center of the first ground portion B and the center of the feed portion A.

[0197] In addition, the center distance between the second ground portion C and the feeding portion A is a second value d2. The ratio of the first value d1 to the second value d2 is in the range of 0.8 to 1.2. In this embodiment, the ratio of the first value d1 to the second value d2 is 1. In this way, the first strip conductor 41 of this embodiment is a symmetrical pattern with respect to the feeding portion A. In other implementations, the ratio of the first value d1 to the second value d2 may also be 0.8, 0.88, 0.9, 1.1 or 1.2.

[0198] In other implementations, the ratio of the first value d1 to the second value d2 may not be within the range of 0.8 to 1.2. In this case, the overall symmetry of the first strip conductor 41 is low, and the first matching circuit may be adjusted to compensate for the structural imbalance.

[0199] In this embodiment, the first grounding portion B and the second grounding portion C are respectively flush with the two end surfaces of the first strip conductor 41. In other embodiments, the first grounding portion B may not be flush with the end surface of the first strip conductor 41. The second grounding portion C may not be flush with the end surface of the first strip conductor 41. Figure 9a , Figure 9a yes Figure 1 A partial structural diagram of another embodiment of a composite antenna of an electronic device shown in FIG. A distance d3 between the first ground portion B and the end surface of the first strip conductor 41 is in the range of 0 to 5 mm. For example, d3 is equal to 0.1 mm, 0.8 mm, 1.9 mm, 3.8 mm, 4.1 mm, and 5 mm. A distance d4 between the second ground portion C and the end surface of the first strip conductor 41 is in the range of 0 to 5 mm. For example, d3 is equal to 0.1 mm, 0.8 mm, 1.9 mm, 3.8 mm, 4.1 mm, and 5 mm.

[0200] In one embodiment, the distance d3 between the first grounding portion B and the end surface of the first strip conductor 41 is in the range of 0 to 2.5 mm. For example, d3 is equal to 0.5 mm, 0.8 mm, 1.6 mm, 1.8 mm, 2.1 mm, and 2.5 mm. The distance d4 between the second grounding portion C and the end surface of the first strip conductor 41 is in the range of 0 to 2.5 mm. For example, d4 is equal to 0.5 mm, 0.8 mm, 1.6 mm, 1.8 mm, 2.1 mm, and 2.5 mm.

[0201] In other embodiments, the distance d3 between the first ground portion B and the end surface of the first strip conductor 41 is between 0 and 0.12λ. The distance d4 between the second ground portion C and the end surface of the first strip conductor 41 is between 0 and 0.12λ. λ is the wavelength of the signal radiated by the antenna. For example, the antenna can produce a resonance with a frequency of 3.0 GHz, where the wavelength λ refers to the wavelength of the signal radiated by the antenna with a frequency of 3.0 GHz. It should be understood that the wavelength of the radiated signal in the air can be calculated as follows: wavelength = speed of light / frequency, where frequency is the frequency of the radiated signal. The wavelength of the radiated signal in the medium can be calculated as follows: Among them, ε is the relative dielectric constant of the medium, and frequency is the frequency of the radiation signal.

[0202] In other embodiments, the distance d3 between the first ground portion B and the end surface of the first strip conductor 41 is between 0 and 0.06λ. The distance d4 between the second ground portion C and the end surface of the first strip conductor 41 is between 0 and 0.06λ.

[0203] The structure of the wire antenna is introduced below with reference to the relevant drawings.

[0204] See also Figure 9b , and combined with Figure 7 As shown, Figure 9b yes Figure 1 The schematic diagram of the structure of the back cover, the second strip conductor and the third strip conductor of the electronic device shown in FIG. Figure 9b Also indicated Figure 1 The NN line shown, that is, Figure 7 The electronic device 100 also includes a second strip conductor 51 and a third strip conductor 52. The material of the second strip conductor 51 and the third strip conductor 52 can be, but is not limited to, copper, gold, silver or graphene. The second strip conductor 51 and the third strip conductor 52 are radiators of the wire antenna, that is, the second strip conductor 51 and the third strip conductor 52 can radiate electromagnetic wave signals according to the radio frequency signal. In addition, the second strip conductor 51 and the third strip conductor 52 can also receive electromagnetic wave signals, convert the electromagnetic wave signals into radio frequency signals, and transmit the radio frequency signals to the radio frequency transceiver circuit 46.

[0205] In addition, the second strip conductor 51 and the third strip conductor 52 are fixed to the back cover 11. Specifically, the second strip conductor 51 and the third strip conductor 52 are both fixed to the surface of the back cover 11 facing the circuit board 30. At this time, the second strip conductor 51 and the third strip conductor 52 are both located on the side of the first strip conductor 41 facing away from the circuit board 30, that is, in the Z-axis direction, the second strip conductor 51 and the third strip conductor 52 have a height difference with the first strip conductor 41. In addition, in the Z-axis direction, a second gap 31 is formed between the second strip conductor 51 and the circuit board 30. A third gap 32 is formed between the third strip conductor 52 and the circuit board 30. The second gap 31 and the third gap 32 form a clearance area of ​​the line antenna.

[0206] In other embodiments, the second strip conductor 51 and the third strip conductor 52 may also be embedded in the rear cover 11 , or fixedly connected to the surface of the rear cover 11 facing away from the circuit board 30 .

[0207] In other embodiments, when the first strip conductor 41 is fixed to the surface of the bracket 50 facing the circuit board 30, the second strip conductor 51 and the third strip conductor 52 may also be fixed to the surface of the bracket 50 facing the back cover 11, or may be embedded in the bracket 50, or may be fixed to the surface of the back cover 11 facing the circuit board 30, or may be embedded in the back cover 11, or may be fixed to the surface of the back cover 11 facing away from the circuit board 30.

[0208] In other embodiments, when the first strip conductor 41 is fixed to the surface of the back cover 11 facing the circuit board 30 , the second strip conductor 51 and the third strip conductor 52 may also be embedded in the back cover 11 or fixed to the surface of the back cover 11 facing away from the circuit board 30 .

[0209] In other embodiments, the second strip conductor 51 and the third strip conductor 52 may also be disposed in the same layer as the first strip conductor 41. In this case, in the Z-axis direction, there is no height difference between the second strip conductor 51 and the third strip conductor 52 and the first strip conductor 41.

[0210] Please refer again Figure 8 , the second strip conductor 51 includes a first end 511 and a second end 512 disposed away from the first end 511. The first end 511 of the second strip conductor 51 is electrically connected to the first grounding portion B of the first strip conductor 41. It can be understood that the first end 511 of the second strip conductor 51 is electrically connected to the first grounding portion B of the first strip conductor 41, including two implementations: the first implementation is that the second strip conductor 51 is spaced apart from the first strip conductor 41, that is, in the Z-axis direction, there is a height difference between the second strip conductor 51 and the first strip conductor 41. In this case, the RF signal can be fed to the first end 511 of the second strip conductor 51 at the first grounding portion B of the first strip conductor 41 through magnetic field coupling. The second implementation is that the second strip conductor 51 is disposed in the same layer as the first strip conductor 41, and the first end 511 of the second strip conductor 51 is connected to the first grounding portion B of the first strip conductor 41. In this case, the RF signal can be fed to the first end 511 of the second strip conductor 51 through the first grounding portion B. In this embodiment, the first method is used as an example for description. The second method will be described in detail below in conjunction with the relevant drawings. No further details will be given here.

[0211] In addition, the second end portion 512 of the second strip conductor 51 is an open end, that is, the second end portion 512 of the second strip conductor 51 is not grounded.

[0212] In other embodiments, the second end 512 of the second strip conductor 51 is electrically connected to the first ground portion B of the first strip conductor 41. The first end 511 of the second strip conductor 51 is an open end, that is, the first end 511 of the second strip conductor 51 is not grounded.

[0213] Please refer again Figure 8, the third strip conductor 52 includes a first end 521 and a second end 522 away from the first end 521. The first end 521 of the third strip conductor 52 is electrically connected to the second grounding portion C of the first strip conductor 41. It can be understood that the first end 521 of the third strip conductor 52 is electrically connected to the second grounding portion C of the first strip conductor 41, including two implementations: the first implementation is that the third strip conductor 52 is spaced apart from the first strip conductor 41, that is, in the Z-axis direction, there is a height difference between the third strip conductor 52 and the first strip conductor 41. In this case, the RF signal can be fed to the first end 521 of the third strip conductor 52 at the second grounding portion C of the first strip conductor 41 through magnetic field coupling. The second implementation is that the third strip conductor 52 is arranged in the same layer as the first strip conductor 41, and the first end 521 of the third strip conductor 52 is connected to the second grounding portion C of the first strip conductor 41. In this case, the RF signal can be fed to the first end 521 of the third strip conductor 52 through the second grounding portion C. In this embodiment, the first method is used as an example for description. The second method will be described in detail below in conjunction with the relevant drawings. No further details will be given here.

[0214] In addition, the second end portion 522 of the third strip conductor 52 is an open end, that is, the second end portion 522 of the third strip conductor 52 is not grounded.

[0215] In other embodiments, the second end 522 of the third strip conductor 52 is electrically connected to the second ground portion C of the first strip conductor 41. The first end 521 of the third strip conductor 52 is an open end, that is, the first end 521 of the third strip conductor 52 is not grounded.

[0216] In other embodiments, the electrical connection position between the first end 511 of the second strip conductor 51 and the first strip conductor 41 and the electrical connection position between the first end 521 of the third strip conductor 52 and the first strip conductor 41 may be swapped. Specifically, the first end 511 of the second strip conductor 51 is electrically connected to the second grounding portion C of the first strip conductor 41. The first end 521 of the third strip conductor 52 is electrically connected to the first grounding portion B of the first strip conductor 41.

[0217] Please refer again Figure 8 , the length of the second strip conductor 51 is the first length L1. The length of the third strip conductor 52 is the second length L2. The first length L1 is equal to the second length L2. It can be understood that, when tolerance and error are taken into account, within an allowable range, the first length L1 can be slightly greater than the second length L2, or slightly less than the second length L2. In other words, the first length L1 is substantially equal to the second length L2.

[0218] In other embodiments, the second length L2 may also be greater than or less than the first length L1. Specifically, this will be described in detail below in conjunction with the relevant drawings.

[0219] See also Fig.10 , and combined with Figure 7 As shown, Fig.10 yes Figure 7 A schematic diagram of projections of a first strip conductor, a second strip conductor, and a third strip conductor on a circuit board in an embodiment is shown. The projection of the first strip conductor 41 on the board surface of the circuit board 30 is the first projection S1. The projection of the second strip conductor 51 on the board surface of the circuit board 30 is the second projection S2. The angle between the second projection S2 and the first projection S1 is α. In this embodiment, α is equal to 180°. In other embodiments, α may also be equal to 40°, 90°, 100°, 125°, 152°, 200°, 270°, or 300°.

[0220] In one implementation, α is in the range of 90° to 270°. At this time, the first strip conductor 41 and the second strip conductor 51 are not likely to interfere with or affect each other when transmitting and receiving electromagnetic wave signals.

[0221] In addition, the projection of the third strip conductor 52 on the board surface of the circuit board 30 is a third projection S3. The angle between the third projection S3 and the first projection S1 is β. In this embodiment, β is equal to 180°. In other embodiments, β may also be equal to 40°, 90°, 100°, 125°, 150°, 200°, 270° or 300°.

[0222] In one implementation, β is in the range of 90° to 270°. At this time, the first strip conductor 41 and the third strip conductor 52 are not likely to interfere with or affect each other when transmitting and receiving electromagnetic wave signals.

[0223] Thus, in this embodiment, the second strip conductor 51 and the third strip conductor 52 are symmetrical with respect to the feeding portion A.

[0224] Please refer again Fig.10 , the area of ​​the overlap region R1 between the first projection S1 and the second projection S2 is in the range of 0-16 square millimeters. For example, the area of ​​the overlap region R1 is 0 mm, 3 mm, 7 mm, 10 mm or 12 mm. In this embodiment, the area of ​​the overlap region R1 between the first projection S1 and the second projection S2 is 8 square millimeters. It can be understood that the area of ​​the overlap region R1 is 0 mm, 3 mm, 7 mm, 10 mm or 12 mm. Fig.10The overlapping area R1 of the first projection S1 and the second projection S2 is only schematically shown as a rectangle. However, when the shapes of the first strip conductor 41 and the second strip conductor 51 change, the overlapping area R1 of the first projection S1 and the second projection S2 may also be other shapes, such as an irregular shape or a trapezoid. In addition, the first projection S1 and the second projection S2 are not limited to the adjacent Fig.10 The first projection S1 and the second projection S2 may also be partially offset in the X-axis direction. In addition, the first projection S1 and the second projection S2 are not limited to being offset in the Y-axis direction. Fig.10 As shown in the diagram, the first projection S1 and the second projection S2 may be partially offset in the Y-axis direction.

[0225] In other embodiments, the area of ​​the overlapping region R1 between the first projection S1 and the second projection S2 may not be within the range of 0-16 square millimeters.

[0226] In addition, the area of ​​the overlapping region R2 of the first projection S1 and the third projection S3 is in the range of 0-16 square millimeters. For example, the area of ​​the overlapping region R2 is 0 mm, 3 mm, 7 mm, 10 mm or 16 mm, etc. In this embodiment, the area of ​​the overlapping region R2 of the first projection S1 and the third projection S3 is 8 square millimeters. It can be understood that the overlapping area of ​​the first projection S1 and the third projection S3 is a rectangle. However, when the shapes of the first strip conductor 41 and the third strip conductor 52 change, the overlapping area of ​​the first projection S1 and the third projection S3 can also be other shapes, such as an irregular shape, or a trapezoid, etc. In addition, the first projection S1 and the third projection S3 are not limited to the adjacent X-axis direction. Fig.10 The first projection S1 and the third projection S3 may also be partially offset in the X-axis direction. In addition, the first projection S1 and the third projection S3 are not limited to being offset in the Y-axis direction. Fig.10 As shown in the diagram, the first projection S1 and the third projection S3 may be partially offset in the Y-axis direction.

[0227] In other embodiments, the area of ​​the overlapping region R2 between the first projection S1 and the third projection S3 may not be within the range of 0-16 square millimeters.

[0228] The simulation of the composite antenna provided by the first embodiment is described below with reference to the accompanying drawings.

[0229] See also Fig.11a , Fig.11a yes Figure 8The relationship between the reflection coefficient (i.e., return loss) and the frequency of the composite antenna in the frequency band of 3 to 6 GHz is shown. The composite antenna can generate two resonances in the range of 3 to 6 GHz, resonance "1" (3.73 GHz) and resonance "2" (4.78 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" is generated by the common mode of the wire antenna of the composite antenna. It can be understood that, except for Fig.11a In addition to the 3.73 GHz and 4.78 GHz frequency bands shown in the figure, the composite antenna of this embodiment can also generate resonance in other frequency bands (for example, 0 GHz to 3 GHz, 6 GHz to 8 GHz, or 8 GHz to 11 GHz), which can be set by adjusting the size of the first strip conductor 41, or adjusting the size of the second strip conductor 51, or adjusting the size of the third strip conductor 52, or adjusting the sizes of the first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 at the same time.

[0230] The following combination Fig.11b and Fig.11c Let's specifically describe the current distribution of the two resonances of the composite antenna: resonance "1" (3.73 GHz) and resonance "2" (4.78 GHz). Fig.11b yes Figure 8 Schematic diagram of current flow in the composite antenna shown at resonance “1”. Fig.11c yes Figure 8 Schematic diagram of current flow in the composite antenna shown at resonance “2”.

[0231] See also Fig.11b , the current distribution of the resonance "1" (3.73GHz) includes a first current flowing from the first ground portion B to the feed portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feed portion A, a third current flowing from the first end portion 511 of the second strip conductor 51 to the second end portion 512 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the first end portion 521 of the third strip conductor 52 to the second end portion 522 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 is greater than the current intensity of the second strip conductor 51 and the third strip conductor 52. In this way, the current of the resonance "1" (3.73GHz) is mainly the current of the first strip conductor 41. In addition, the current of the resonance "1" (3.73GHz) is the current of the differential mode of the slot antenna.

[0232] See also Fig.11c, the current distribution of resonance "2" (4.78GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 is smaller than the current intensity of the second strip conductor 51 and the third strip conductor 52. In this way, the current of resonance "2" (4.78GHz) is mainly the current of the second strip conductor 51 and the third strip conductor 52. The current of resonance "2" (4.78GHz) is the current of the common mode of the wire antenna.

[0233] See also Fig.11d , Fig.11d yes Figure 8 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “1”. Fig.11d The SAR value measured at a distance of 5 mm from the back cover 11 to the human tissue is shown. For resonance "1" (3.73 GHz), two SAR hot spots appear at a distance of 5 mm from the back cover 11 (see Figure 1). Fig.11d Arrows 1 and 2 simply illustrate two SAR hotspots. It can be understood that a SAR hotspot refers to a region where the ratio of the average SAR value in a region to the average SAR value around the region is greater than or equal to 1.2. In this case, the region is called a SAR hotspot. In other words, within a SAR value distribution region, the maximum SAR value appears. In this case, the SAR value region distributed around the maximum SAR value is called a SAR hotspot. In this case, Fig.11d In the figure, SAR hotspots are more prominent than the surrounding SAR distribution areas.

[0234] When the composite antenna is at resonance "1", the first current on the first strip conductor 41 is in opposite directions to the second current. In addition, since the first strip conductor 41 is a symmetrical pattern, the current intensity of the first current is the same as the current intensity of the second current. It can be understood that the better the symmetry of the first strip conductor, the closer the current intensity of the first current is to the current intensity of the second current. In this way, the phases of the magnetic field at the feeding part A are opposite, and the amplitudes of the magnetic field are roughly offset. The magnetic field is mainly distributed on both sides of the feeding part A, forming two SAR hotspots on both sides of the feeding part A. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the resonance "1" (3.73GHz) is relatively low. It can be understood that when the current intensity of the first current is closer to the current intensity of the second current, the SAR value of the resonance "1" (3.73GHz) is lower.

[0235] See also Fig.11e , Fig.11e yes Figure 8 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “2”. Fig.11e The SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "2" (4.78 GHz), two SAR hot spots also appear at 5 mm from the back cover 11 (see Figure 2). Fig.11e Two SAR hot spots are simply indicated by arrows 1 and 2).

[0236] At resonance "2" (4.78 GHz), the third current on the second strip conductor 51 and the fourth current on the third strip conductor 52 of the composite antenna are opposite in direction. In addition, since the second strip conductor 51 and the third strip conductor 52 are symmetrically structured with respect to the feeding portion A, the current intensity of the third current is the same as the current intensity of the fourth current. It can be understood that the better the symmetry between the second strip conductor 51 and the third strip conductor 52, the closer the current intensity of the third current is to the current intensity of the fourth current. At this time, the phases of the magnetic field at the feeding portion A are opposite, and the amplitudes of the magnetic field are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding portion A, forming two SAR hotspots on both sides of the feeding portion A. The energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the resonance "2" (4.78 GHz) is low. It can be understood that the closer the current intensity of the third current is to the current intensity of the fourth current, the lower the SAR value of the resonance "2" (4.78 GHz).

[0237] In this embodiment, since the area of ​​the overlapping region R1 of the first projection S1 and the second projection S2 is 8 square millimeters, the feeding stability of the second strip conductor 51 through the first strip conductor 41 is better. At this time, the third current on the second strip conductor 51 can flow into the circuit board 30 through the first grounding portion B. In addition, since the area of ​​the overlapping region R2 of the first projection S1 and the third projection S3 is 8 square millimeters, the feeding stability of the third strip conductor 52 through the first strip conductor 41 is better. The fourth current of the third strip conductor 52 can flow into the circuit board 30 through the second grounding portion C, so that the current intensity on the second strip conductor 51 and the third strip conductor 52 is greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor 51 and the third strip conductor 52 is also small, and the SAR value of the resonance "2" (4.78GHz) is low.

[0238] In addition, Table 1a shows the SAR value of the electronic device 100 using the composite antenna provided in the first embodiment.

[0239] Table 1a

[0240]

[0241] Table 1a shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the first embodiment at a distance of 5mm from the back cover is generally low, regardless of resonance "1" or resonance "2". Taking into account the inconsistency of the antenna efficiency of resonance "1" and resonance "2", the antenna efficiency of resonance "1" and resonance "2" are normalized to make the antenna efficiency of resonance "1" and resonance "2" consistent. At this time, when the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the first embodiment in terms of low SAR value is more obvious. Regardless of resonance "1" or resonance "2", the SAR value at a distance of 5mm from the back cover is less than 0.5.

[0242] In this embodiment, the antenna design scheme provided in the first embodiment is to design a composite antenna of a slot antenna and a linear antenna, so that under feeding, the composite antenna respectively excites two resonant modes (the slot antenna differential mode and the linear antenna common mode). While achieving wideband coverage, it can also achieve two SAR hotspots in both modes, and the SAR values ​​of the two modes are low.

[0243] Extended implementation mode 1, the same technical contents as those of the first implementation mode are not repeated here: please refer to Fig.11f , Fig.11f yes Figure 7 The schematic diagram of projection of the first strip conductor, the second strip conductor and the third strip conductor on another embodiment of the circuit board is shown. The area of ​​the overlapping region R1 of the first projection S1 and the second projection S2 is 4 square millimeters. The area of ​​the overlapping region R2 of the first projection S1 and the third projection S3 is 4 square millimeters.

[0244] The simulation of the composite antenna provided by the first extended implementation manner is described below with reference to the accompanying drawings.

[0245] See also Figure 11g , Figure 11g yes Fig.11f The composite antenna shown is a graph of reflection coefficient versus frequency in the frequency band of 3 to 6 GHz. The composite antenna can generate two resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.78 GHz) and resonance "2" (4.95 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" is generated by the common mode of the wire antenna of the composite antenna.

[0246] It can be understood that the current distribution of the composite antenna of this embodiment at resonance "1" (3.78 GHz) and the current distribution at resonance "2" (4.95 GHz) are the same as the current distribution of the composite antenna of the first embodiment at resonance "1" (3.73 GHz) and the current distribution at resonance "2" (4.78 GHz). No further description will be given here.

[0247] In addition, for resonance "1" (3.78 GHz), the composite antenna can also have two SAR hot spots at 5 mm from the back cover 11. For resonance "2" (4.95 GHz), two SAR hot spots also appear at 5 mm from the back cover 11.

[0248] In addition, Table 1b shows the SAR value of the electronic device 100 using the composite antenna provided by the first extended implementation manner.

[0249] Table 1b

[0250]

[0251] Table 1b shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the extended implementation mode 1 at a distance of 5mm from the back cover is generally low, regardless of resonance "1" or resonance "2". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the extended implementation mode in terms of low SAR value is more obvious. Regardless of resonance "1" or resonance "2", the SAR value at a distance of 5mm from the back cover is less than 0.5.

[0252] Extended implementation mode 2, the same technical contents as those of the first implementation mode are not repeated here: Fig.11h , Fig.11h yes Figure 7 The schematic diagram of projection of the first strip conductor, the second strip conductor and the third strip conductor on another embodiment of the circuit board. The area of ​​the overlapping region R1 of the first projection S1 and the second projection S2 is 16 square millimeters. The area of ​​the overlapping region R2 of the first projection S1 and the third projection S3 is 16 square millimeters.

[0253] The simulation of the composite antenna provided by the second extended implementation manner is described below with reference to the accompanying drawings.

[0254] See also Fig.11i , Fig.11i yes Fig.11hThe relationship between the reflection coefficient and the frequency of the composite antenna in the frequency band of 3 to 6 GHz is shown. The composite antenna can generate two resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.68 GHz) and resonance "2" (4.65 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" is generated by the common mode of the wire antenna of the composite antenna.

[0255] It can be understood that the current distribution of the composite antenna of this embodiment at resonance "1" (3.68 GHz) and the current distribution at resonance "2" (4.65 GHz) are the same as the current distribution of the composite antenna of the first embodiment at resonance "1" (3.73 GHz) and the current distribution at resonance "2" (4.78 GHz). No further details will be given here.

[0256] In addition, for resonance "1" (3.68 GHz), the composite antenna can also have two SAR hot spots at 5 mm from the back cover 11. For resonance "2" (4.65 GHz), two SAR hot spots also appear at 5 mm from the back cover 11.

[0257] In addition, Table 1c shows the SAR value of the electronic device 100 using the composite antenna provided by the second extended implementation manner.

[0258] Table 1c

[0259]

[0260] Table 1c shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the extended implementation mode 2 at a distance of 5mm from the back cover is generally low, regardless of resonance "1" or resonance "2". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the extended implementation mode in terms of low SAR value is more obvious. Regardless of resonance "1" or resonance "2", the SAR value at a distance of 5mm from the back cover is less than 0.5.

[0261] It can be understood that according to the first embodiment, the extended embodiment 1 and the extended embodiment 2, the area of ​​the overlapping region R1 between the first projection S1 and the second projection S2, and the area of ​​the overlapping region R2 between the first projection S1 and the third projection S3 have little effect on the SAR value generated by the resonance “1”.

[0262] In addition, the area of ​​the overlapping region R1 between the first projection S1 and the second projection S2, and the area of ​​the overlapping region R2 between the first projection S1 and the third projection S3 have a greater impact on the SAR value generated by the resonance "2". When the area of ​​the overlapping region R1 between the first projection S1 and the second projection S2 is within the range of 0-16 square millimeters, and the area of ​​the overlapping region R2 between the first projection S1 and the third projection S3 is within the range of 0-16 square millimeters, the SAR value generated by the resonance "2" is small.

[0263] The second implementation mode, the same technical contents as the first implementation mode are not repeated here: please refer to Fig.12 , Fig.12 yes Figure 1 A partial structural diagram of another embodiment of a composite antenna of an electronic device is shown. The first end 511 of the second strip conductor 51 is connected to the first grounding portion B of the first strip conductor 41. At this time, the first end 511 of the second strip conductor 51 is grounded. The radio frequency signal can be fed to the second strip conductor 51 via the first grounding portion B of the first strip conductor 41.

[0264] In addition, the second end portion 512 of the second strip conductor 51 is an open end, that is, the second end portion 512 of the second strip conductor 51 is not grounded.

[0265] The first end 521 of the third strip conductor 52 is connected to the second ground portion C of the first strip conductor 41. At this time, the first end 521 of the third strip conductor 52 is grounded. The RF signal can be fed to the third strip conductor 52 via the second ground portion C of the first strip conductor 41. In addition, the second end 522 of the third strip conductor 52 is an open end, that is, the second end 522 of the third strip conductor 52 is not grounded.

[0266] See also Fig.13 , and combined with Fig.12 As shown, Fig.13 yes Figure 1 The schematic diagram of a partial cross section of another embodiment of the electronic device shown in FIG. 4 is a schematic diagram of a partial cross section of another embodiment of the electronic device along line NN. The first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 are arranged in the same layer. Fig.13 It is shown that the first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 are all fixed on the surface of the bracket 50 facing the back cover 11. In other embodiments, the first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 may also be all fixed on the surface of the bracket 50 facing the circuit board 30, or all embedded in the bracket 50, or fixed on the surface of the back cover 11 facing the circuit board 30, or embedded in the back cover 11, or fixed on the surface of the back cover 11 facing away from the circuit board 30.

[0267] The simulation of the composite antenna provided by the second embodiment is described below with reference to the accompanying drawings.

[0268] See also Fig.14a , Fig.14a yes Fig.12 The composite antenna shown is a graph of reflection coefficient versus frequency in the frequency band of 3 to 6 GHz. The composite antenna can generate two resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.57 GHz) and resonance "2" (4.46 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" is generated by the common mode of the wire antenna of the composite antenna. It can be understood that, except for Fig.14a In addition to the 3.57 GHz, 4.46 GHz frequency bands shown in the figure, the composite antenna of this embodiment can also generate resonance in other frequency bands (for example, 0 GHz to 3 GHz, 6 GHz to 8 GHz, or 8 GHz to 11 GHz), which can be specifically set by adjusting the size of the first strip conductor 41, or adjusting the size of the second strip conductor 51, or adjusting the size of the third strip conductor 52, or adjusting the sizes of the first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 at the same time.

[0269] The following combination Fig.14b and Fig.14c Let's specifically describe the current distribution of the two resonances of the composite antenna: resonance "1" (3.57 GHz) and resonance "2" (4.46 GHz). Fig.14b yes Fig.12 Schematic diagram of current flow in the composite antenna shown at resonance “1”. Fig.14c yes Fig.12 Schematic diagram of current flow in the antenna at resonance "2".

[0270] See also Fig.14b , the current distribution of the resonance "1" (3.57GHz) includes a first current flowing from the first ground portion B to the feed portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feed portion A, a third current flowing from the first end portion 511 of the second strip conductor 51 to the second end portion 512 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the first end portion 521 of the third strip conductor 52 to the second end portion 522 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 is greater than the current intensity of the second strip conductor 51 and the third strip conductor 52. In this way, the current of the resonance "1" (3.57GHz) is mainly the current of the first strip conductor 41. In addition, the current of the resonance "1" (3.57GHz) is the current of the differential mode of the slot antenna.

[0271] See also Fig.14c, the current distribution of resonance "2" (4.46GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 is smaller than the current intensity of the second strip conductor 51 and the third strip conductor 52. In this way, the current of resonance "2" (4.46GHz) is mainly the current of the second strip conductor 51 and the third strip conductor 52. The current of resonance "2" (4.46GHz) is the current of the common mode of the wire antenna.

[0272] See also Fig.14d , Fig.14d yes Fig.12 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “1”. Fig.14d The SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "1" (3.57 GHz), two SAR hot spots appear at 5 mm from the back cover 11 (see Figure 1). Fig.14d Two SAR hot spots are simply indicated by arrows 1 and 2).

[0273] It can be understood that, when the composite antenna is at resonance "1", the first current on the first strip conductor 41 is opposite to the direction of the second current. In addition, since the first strip conductor 41 is a symmetrical pattern, the current intensity of the first current is the same as the current intensity of the second current. At this time, the phases of the magnetic fields at the feeding part A are opposite, and the amplitudes of the magnetic fields are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part A, forming two SAR hotspots on both sides of the feeding part A. At this time, the energy of the radiated electromagnetic waves is relatively dispersed, and the SAR value of resonance "1" (3.57GHz) is relatively low.

[0274] See also Fig.14e , Fig.14e yes Fig.12 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “2”. Fig.11e The SAR value measured at a distance of 5 mm between the human body tissue and the back cover 11 is shown. For resonance "2" (4.46 GHz), two SAR hot spots also appear at a distance of 5 mm between the back cover 11 (see Figure 2). Fig.14e Two SAR hot spots are simply indicated by arrows 1 and 2).

[0275] It can be understood that the third current on the second strip conductor 51 is opposite to the fourth current on the third strip conductor 52. In addition, since the second strip conductor 51 and the third strip conductor 52 are symmetrically structured with respect to the feed portion A, the current intensity of the third current is the same as the current intensity of the fourth current. At this time, the phases of the magnetic field at the feed portion A are opposite, and the amplitudes of the magnetic field are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feed portion A, forming two SAR hotspots on both sides of the feed portion A. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the resonance "2" (4.46GHz) is relatively low.

[0276] In addition, since the first end 511 of the second strip conductor 51 is connected to the first grounding portion B of the first strip conductor 41, the third current on the second strip conductor 51 flows into the circuit board 30 through the first grounding portion B. In addition, since the first end 521 of the third strip conductor 52 is connected to the second grounding portion C of the first strip conductor 41, the fourth current of the third strip conductor 52 flows into the circuit board 30 through the second grounding portion C. In this way, the current intensity on the second strip conductor 51 and the third strip conductor 52 is greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor 51 and the third strip conductor 52 is also small, and the SAR value of the resonance "2" (4.46GHz) is low.

[0277] In addition, Table 2 shows the SAR value of the electronic device 100 using the composite antenna provided in the second embodiment.

[0278] Table 2

[0279]

[0280] Table 2 shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the second embodiment at a distance of 5mm from the back cover is relatively low, regardless of resonance "1" or resonance "2". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the second embodiment in terms of low SAR value is more obvious. Regardless of resonance "1" or resonance "2", the SAR value at a distance of 5mm from the back cover is less than 0.5.

[0281] In this embodiment, the antenna design scheme provided by the second embodiment is to design a composite antenna of a slot antenna and a linear antenna, so that under feeding, the composite antenna respectively excites two resonant modes (the slot antenna differential mode and the linear antenna common mode), while achieving wide-band coverage, and achieving two SAR hotspots in both modes, and the SAR values ​​of both modes are low.

[0282] The third implementation mode, the same technical contents as the first implementation mode are not repeated here: Fig.15 , Fig.15 yes Figure 1 The schematic diagram of a part of the structure of another embodiment of the composite antenna of the electronic device is shown in FIG. Different from the first embodiment, the length L1 of the second strip conductor 51 is smaller than the length L2 of the third strip conductor 52 .

[0283] The simulation of the composite antenna provided by the third embodiment is described below with reference to the accompanying drawings.

[0284] See also Fig.16a , Fig.16a yes Fig.15 The composite antenna shown is a graph of the relationship between the reflection coefficient and the frequency in the frequency band of 3 to 6 GHz. The composite antenna can generate three resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.86 GHz), resonance "2" (4.46 GHz) and resonance "3" (5.08 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" and resonance "3" are both generated by the common mode of the wire antenna of the composite antenna. It can be understood that except for Fig.16a In addition to the frequency bands of 3.86 GHz, 4.46 GHz and 5.08 GHz shown in the figure, the composite antenna of this embodiment can also generate resonance in other frequency bands (for example, 0 GHz to 3 GHz, 6 GHz to 8 GHz, or 8 GHz to 11 GHz), which can be set by adjusting the size of the first strip conductor 41, or adjusting the size of the second strip conductor 51, or adjusting the third strip conductor 52, or adjusting the sizes of the first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 at the same time.

[0285] The following combination Fig.16b , Fig.16c and Fig.16d Let's specifically describe the current distribution of the three resonances of the composite antenna: resonance "1" (3.86 GHz), resonance "2" (4.46 GHz), and resonance "3" (5.08 GHz). Fig.16b yes Fig.15 Schematic diagram of current flow in the composite antenna shown at resonance “1”. Fig.16c yes Fig.15 Schematic diagram of current flow in the antenna at resonance "2". Fig.16d yes Fig.15 Schematic diagram of current flow in the composite antenna shown at resonance “3”.

[0286] See also Fig.16b, the current distribution of the resonance "1" (3.86GHz) includes a first current flowing from the first ground portion B to the feed portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feed portion A, a third current flowing from the first end portion 511 of the second strip conductor 51 to the second end portion 512 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the first end portion 521 of the third strip conductor 52 to the second end portion 522 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 is greater than the current intensity of the second strip conductor 51 and the third strip conductor 52. In this way, the current of the resonance "1" (3.86GHz) is mainly the current of the first strip conductor 41. In addition, the current of the resonance "1" (3.86GHz) is the current of the differential mode of the slot antenna.

[0287] See also Fig.16c , the current distribution of resonance "2" (4.46GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 and the second strip conductor 51 are both smaller than the current intensity of the third strip conductor 52. In this way, the current of resonance "2" (4.46GHz) is mainly the current of the third strip conductor 52. The current of resonance "2" (4.46GHz) is the current of the common mode of the wire antenna.

[0288] See also Fig.16d , the current distribution of resonance "3" (5.08GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a first current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, and a second current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 and the third strip conductor 52 are both smaller than the current intensity of the second strip conductor 51. In this way, the current of resonance "3" (5.08GHz) is mainly the current of the second strip conductor 51. The current of resonance "3" (5.08GHz) is the current of the common mode of the wire antenna.

[0289] See also Fig.16e , Fig.16e yes Fig.15Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “1”. Fig.16e The SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "1" (3.86 GHz), two SAR hot spots appear at 5 mm from the back cover 11 (see Figure 1). Fig.16e Two SAR hotspots are simply indicated by arrows 1 and 2). It can be understood that, under resonance "1", the first current on the first strip conductor 41 is opposite to the direction of the second current of the composite antenna. In addition, since the first strip conductor 41 is a symmetrical pattern, the current intensity of the first current is the same as the current intensity of the second current. At this time, the phases of the magnetic fields at the feeding part A are opposite, and the amplitudes of the magnetic fields are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part A, forming two SAR hotspots on both sides of the feeding part A. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, so the SAR value of resonance "1" (3.86GHz) is relatively low.

[0290] See also Fig.16f , Fig.16f yes Fig.15 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “2”. Fig.16f The SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "2" (4.46 GHz), a SAR hotspot appears at 5 mm from the back cover 11 (see Figure 2). Fig.16f A SAR hotspot is simply indicated by arrow 1. In addition, the fourth current of the third strip conductor 52 can flow into the circuit board 30 via the second grounding portion C. Thus, the current intensity on the third strip conductor 52 is greatly weakened, the magnetic field intensity generated by the third strip conductor 52 is also small, and the SAR value of the resonance "2" (4.46 GHz) is low. Therefore, although a SAR hotspot appears at the resonance "2" (4.46 GHz), the SAR value of the resonance "2" (4.46 GHz) is also low.

[0291] See also Figure 16g , Figure 16g yes Fig.15 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “3” is shown. Figure 16g The SAR value measured when the human body is 5 mm away from the back cover 11 is shown. For resonance "3" (5.08 GHz), a SAR hotspot also appears at 5 mm from the back cover 11 (see Figure 2). Figure 16gA SAR hotspot is simply indicated by arrow 1. In addition, the third current on the second strip conductor 51 can flow into the circuit board 30 via the first grounding portion B. Thus, the current intensity on the second strip conductor 51 is weakened to a large extent, the magnetic field intensity generated by the second strip conductor 51 is also small, and the SAR value of the resonance "3" (5.08 GHz) is low. Therefore, although a SAR hotspot appears at the resonance "3" (5.08 GHz), the SAR value of the resonance "3" (5.08 GHz) is also low.

[0292] In addition, Table 3 shows the SAR value of the electronic device 100 using the composite antenna provided by the third embodiment.

[0293] Table 3

[0294]

[0295] Table 3 shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the third embodiment at a distance of 5mm from the back cover is generally low, regardless of resonance "1", resonance "2" or resonance "3". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the third embodiment in terms of low SAR value is more obvious. Regardless of resonance "1", resonance "2" or resonance "3", the SAR value at a distance of 5mm from the back cover is less than 0.9.

[0296] In this embodiment, the antenna design scheme provided by the third embodiment is to design a composite antenna of a slot antenna and a linear antenna, so that under feeding, the composite antenna respectively excites three resonant modes (differential mode of the slot antenna and common mode of the linear antenna), thereby achieving wideband coverage while achieving low SAR values ​​of the three modes, and one of the resonant modes can generate two SAR hotspots.

[0297] It is understandable that the arrangement of the second strip conductor 51 of this embodiment can also refer to the arrangement of the second strip conductor 51 of the second embodiment. The arrangement of the third strip conductor 52 of this embodiment can also refer to the arrangement of the third strip conductor 52 of the second embodiment. No further description is given here.

[0298] The fourth implementation mode, the same technical contents as the first implementation mode are not repeated here: Fig.17 , Fig.17 yes Figure 1The electronic device 100 includes a second strip conductor 51. The electronic device 100 no longer includes a third strip conductor 52. The formation and arrangement of the second strip conductor 51 can refer to the formation and arrangement of the first conductor 51 in the first embodiment. No further details will be given here.

[0299] The simulation of the composite antenna provided by the fourth embodiment is described below with reference to the accompanying drawings.

[0300] See also Fig.18a , Fig.18a yes Fig.17 The composite antenna shown is a graph of reflection coefficient versus frequency in the frequency band of 3 to 6 GHz. The composite antenna can generate two resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.68 GHz) and resonance "2" (4.76 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" is generated by the common mode of the wire antenna of the composite antenna. It can be understood that, except for Fig.18a In addition to the 3.68 GHz, 4.76 GHz frequency bands shown in the figure, the composite antenna of this embodiment can also generate resonance in other frequency bands (for example, 0 GHz to 3 GHz, 6 GHz to 8 GHz, or 8 GHz to 11 GHz), which can be set by adjusting the size of the first strip conductor 41, or adjusting the size of the second strip conductor 51, or adjusting the sizes of the first strip conductor 41 and the second strip conductor 51 at the same time.

[0301] The following combination Fig.18b and Fig.18c Let's specifically describe the current distribution of the two resonances of the composite antenna: resonance "1" (3.68 GHz) and resonance "2" (4.76 GHz). Fig.18b yes Fig.17 Schematic diagram of current flow in the composite antenna shown at resonance “1”. Fig.18c yes Fig.17 Schematic diagram of current flow in the antenna at resonance "2".

[0302] See also Fig.18b, the current distribution of resonance "1" (3.68GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41, a second current flowing from the second ground portion C to the feeding portion A, and a third current flowing from the first end portion 511 of the second strip conductor 51 to the second end portion 512 of the second strip conductor 51 on the second strip conductor 51. The current intensity of the first strip conductor 41 is greater than the current intensity of the second strip conductor 51. In this way, the current of resonance "1" (3.68GHz) is mainly the current of the first strip conductor 41. In addition, the current of resonance "1" (3.68GHz) is the current of the differential mode of the slot antenna.

[0303] See also Fig.18c , the current distribution of resonance "2" (4.76GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41, a second current flowing from the second ground portion C to the feeding portion A, and a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51. The current intensity of the first strip conductor 41 is less than the current intensity of the second strip conductor 51. In this way, the current of resonance "2" (4.76GHz) is mainly the current of the second strip conductor 51. The current of resonance "2" (4.76GHz) is the current of the common mode of the wire antenna.

[0304] See also Fig.18d , Fig.18d yes Fig.17 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “1”. Fig.18d The SAR value measured at a distance of 5 mm from the back cover 11 to the human tissue is shown. For resonance "1" (3.68 GHz), two SAR hot spots appear at a distance of 5 mm from the back cover 11 (see Figure 1). Fig.18d Two SAR hotspots are simply indicated by arrows 1 and 2). It can be understood that, under resonance "1", the first current on the first strip conductor 41 is opposite to the direction of the second current of the composite antenna. In addition, since the first strip conductor 41 is a symmetrical pattern, the current intensity of the first current is the same as the current intensity of the second current. At this time, the phases of the magnetic fields at the feeding part A are opposite, and the amplitudes of the magnetic fields are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part A, forming two SAR hotspots on both sides of the feeding part A. At this time, the energy of the radiated electromagnetic waves is relatively dispersed, so the SAR value of resonance "1" (3.68GHz) is relatively low.

[0305] See also Fig.18e , Fig.18e yes Fig.17 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “2”. Fig.18eThe SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "2" (4.76 GHz), a SAR hotspot appears at 5 mm from the back cover 11 (see Figure 2). Fig.18e The SAR hotspot is simply indicated by arrow 1. In addition, the third current on the second strip conductor 51 can flow into the circuit board 30 via the first grounding portion B, so that the current intensity on the second strip conductor 51 is greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor 51 is also small, and the SAR value of the resonance "2" (4.76 GHz) is low. Therefore, although a SAR hotspot appears at the resonance "2" (4.76 GHz), the SAR value of the resonance "2" (4.76 GHz) is also low.

[0306] In addition, Table 4 shows the SAR value of the electronic device 100 using the composite antenna provided in the fourth embodiment.

[0307] Table 4

[0308]

[0309] Table 4 shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the fourth embodiment at a distance of 5mm from the back cover is relatively low regardless of resonance "1" or resonance "2". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the fourth embodiment in terms of low SAR value is more obvious. Regardless of resonance "1" or resonance "2", the SAR value at a distance of 5mm from the back cover is less than 0.8.

[0310] In this embodiment, the antenna design scheme provided in the fourth embodiment is to design a composite antenna of a slot antenna and a linear antenna, so that under feeding, the composite antenna respectively excites two resonant modes (the slot antenna differential mode and the linear antenna common mode), thereby achieving wideband coverage while also achieving low SAR values ​​for the two modes, and one of the resonant modes can generate two SAR hotspots.

[0311] It is understandable that the arrangement of the second strip conductor 51 in this embodiment can also refer to the arrangement of the second strip conductor 51 in the second embodiment, which will not be described in detail here.

[0312] The fifth implementation mode, the same technical contents as the first implementation mode are not repeated here: please refer to Fig.19 , Fig.19 yes Figure 1A partial structural diagram of another embodiment of a composite antenna of an electronic device is shown. The electronic device 100 includes a first strip conductor 41, a second strip conductor 51, and a third strip conductor 52. The formation and arrangement of the first strip conductor 41, the second strip conductor 51, and the third strip conductor 52 can refer to the formation and arrangement of the first strip conductor 41, the second strip conductor 51, and the third strip conductor 52 in the first embodiment. No further description will be given here.

[0313] See also Fig. 20 , Fig. 20 yes Fig.19 The structure schematic diagram of the composite antenna shown in another angle. The second strip conductor 51 includes a first end 511 and a second end 512 disposed away from the first end 511. The third strip conductor 52 includes a first end 521 and a second end 522 disposed away from the first end 521. The first end 511 of the second strip conductor 51 is connected to the first end 521 of the third strip conductor 52.

[0314] The first end 511 of the second strip conductor 51 and the first end 521 of the third strip conductor 52 are electrically connected to the first ground portion B of the first strip conductor 41. It can be understood that the first end 511 of the second strip conductor 51 and the first end 521 of the third strip conductor 52 are electrically connected to the first ground portion B in two embodiments: the first embodiment is that the first end 511 of the second strip conductor 51 and the first end 521 of the third strip conductor 52 are spaced apart from the first ground portion B, that is, in the Z-axis direction, there is a height difference between the second strip conductor 51 and the first strip conductor 41, and there is a height difference between the third strip conductor 52 and the first strip conductor 41. At this time, the RF signal can be fed to the first end 511 of the second strip conductor 51 and the first end 521 of the third strip conductor 52 at the first ground portion B of the first strip conductor 41 through magnetic field coupling. The second mode is that the first end 511 of the second strip conductor 51 and the first end 521 of the third strip conductor 52 are connected to the first grounding portion B of the first strip conductor 41, that is, in the Z-axis direction, the second strip conductor 51, the third strip conductor 52 and the first strip conductor 41 are arranged in the same layer. In this case, the RF signal can be fed to the first end 511 of the second strip conductor 51 and the first end 521 of the third strip conductor 52 through the first grounding portion B. In this embodiment, the first mode is taken as an example for description.

[0315] In addition, the second end 512 of the second strip conductor 51 is an open end, that is, the second end 512 of the second strip conductor 51 is not grounded. The second end 522 of the third strip conductor 52 is an open end, that is, the second end 522 of the third strip conductor 52 is not grounded.

[0316] In other embodiments, the first end portion 511 of the second strip conductor 51 and the first end portion 521 of the third strip conductor 52 are electrically connected to the second ground portion C of the first strip conductor 41 .

[0317] In this embodiment, the center distance between the first ground portion B and the feeding portion A and the center distance between the second ground portion C and the feeding portion A can refer to the relationship between the first value d1 and the second value d2 of the first embodiment.

[0318] Please refer again Fig. 20 , the length L1 of the second strip conductor 51 is equal to the length L2 of the third strip conductor 52. It can be understood that, when tolerance and error are considered, within an allowable range, the length L1 of the second strip conductor 51 is slightly greater or slightly less than the length L2 of the third strip conductor 52.

[0319] In other embodiments, the length L1 of the second strip conductor 51 is greater than or less than the length L2 of the third strip conductor 52 .

[0320] See also Fig.21 , and combined with Fig. 20 As shown, Fig.21 yes Fig.19 Schematic diagram of projections of the first strip conductor, the second strip conductor, and the third strip conductor on the circuit board. The projection of the first strip conductor 41 on the board surface of the circuit board 30 is the first projection S1. The projection of the second strip conductor 51 on the board surface of the circuit board 30 is the second projection S2. The angle between the second projection S2 and the first projection S1 is α. In this embodiment, α is equal to 90°. In other embodiments, α may also be equal to 10°, 60°, 125°, 150°, or 200°.

[0321] In one embodiment, d is in the range of 0° to 180°.

[0322] In addition, the projection of the third strip conductor 52 on the board surface of the circuit board 30 is a third projection S3. The angle between the third projection S3 and the first projection S1 is β. In this embodiment, β is equal to 90°. In other embodiments, β may also be equal to 30°, 60°, 125°, 150° or 200°.

[0323] In one implementation, β may also be in the range of 0° to 180°.

[0324] Thus, in this embodiment, the second strip conductor 51 and the third strip conductor 52 are symmetrical with respect to the first ground portion B.

[0325] In addition, the area of ​​the overlapped region of the first projection S1, the second projection S2 and the third projection S3 is in the range of 0-16 square millimeters, such as 0 millimeters, 3 millimeters, 7 millimeters, 10 millimeters or 12 millimeters. In this embodiment, the area of ​​the overlapped region of the first projection S1, the second projection S2 and the third projection S3 is 8 square millimeters. It can be understood that the overlapped region of the first projection S1, the second projection S2 and the third projection S3 is 8 square millimeters. Fig.21 The overlapping area of ​​the first projection S1, the second projection S2 and the third projection S3 is schematically shown as a rectangle. However, when the shapes of the first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 are changed, the overlapping area of ​​the first projection S1, the second projection S2 and the third projection S3 may also be other shapes, such as an irregular shape or a trapezoid. In other embodiments, the area of ​​the overlapping area of ​​the first projection S1, the second projection S2 and the third projection S3 may not be within the range of 0-16 square millimeters.

[0326] The simulation of the composite antenna provided by the fifth embodiment is described below with reference to the accompanying drawings.

[0327] See also Fig.22a , Fig.22a yes Fig.19 The composite antenna shown is a graph of reflection coefficient versus frequency in the frequency band of 3 to 6 GHz. The composite antenna can generate two resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.78 GHz) and resonance "2" (5.34 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" is generated by the common mode of the wire antenna of the composite antenna. It can be understood that, except for Fig.22a In addition to the 3.78 GHz and 5.34 GHz frequency bands shown in the figure, the composite antenna of this embodiment can also generate resonance in other frequency bands (for example, 0 GHz to 3 GHz, 6 GHz to 8 GHz, or 8 GHz to 11 GHz), which can be set by adjusting the size of the first strip conductor 41, or adjusting the size of the second strip conductor 51, or adjusting the size of the third strip conductor 52, or adjusting the sizes of the first strip conductor 41, the second strip conductor 51 and the third strip conductor 52 at the same time.

[0328] The following combination Figure 22b and Fig.22c Let's specifically describe the current distribution of the two resonances of the composite antenna: resonance "1" (3.78 GHz) and resonance "2" (5.34 GHz). Figure 22b yes Fig.19 Schematic diagram of current flow in the composite antenna shown at resonance “1”. Fig.22c yes Fig.19 Schematic diagram of current flow in the antenna at resonance "2".

[0329] See also Figure 22b , the current distribution of resonance "1" (3.78GHz) includes a first current flowing from the first ground portion B to the feed portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feed portion A, a third current flowing from the first end portion 511 of the second strip conductor 51 to the second end portion 512 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the first end portion 521 of the third strip conductor 52 to the second end portion 522 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 is greater than the current intensity of the second strip conductor 51 and the third strip conductor 52. In this way, the current of resonance "1" (3.78GHz) is mainly the current of the first strip conductor 41. In addition, the current of resonance "1" (3.78GHz) is the current of the differential mode of the slot antenna.

[0330] See also Fig.22c , the current distribution of resonance "2" (5.34GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, and a fourth current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52. The current intensity of the first strip conductor 41 is smaller than the current intensity of the second strip conductor 51 and the third strip conductor 52. In this way, the current of resonance "2" (5.34GHz) is mainly the current of the second strip conductor 51 and the third strip conductor 52. The current of resonance "2" (5.34GHz) is the current of the common mode of the wire antenna.

[0331] See also Fig.22d , Fig.22d yes Fig.19 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “1”. Fig.22d The SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "1" (3.78 GHz), two SAR hot spots appear at 5 mm from the back cover 11 (see Figure 1). Fig.22dTwo SAR hotspots are simply indicated by arrows 1 and 2). It can be understood that, under resonance "1", the first current on the first strip conductor 41 is opposite to the direction of the second current of the composite antenna. In addition, since the first strip conductor 41 is a symmetrical pattern, the current intensity of the first current is the same as the current intensity of the second current. At this time, the phases of the magnetic fields at the feeding part A are opposite, and the amplitudes of the magnetic fields are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part A, forming two SAR hotspots on both sides of the feeding part A. At this time, the energy of the radiated electromagnetic waves is relatively dispersed, so the SAR value of resonance "1" (3.78GHz) is relatively low.

[0332] See also Fig.22e , Fig.22e yes Fig.19 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “2”. Fig.22e The SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "2" (5.34 GHz), a SAR hotspot appears at 5 mm from the back cover 11 (see Figure 2). Fig.22e This SAR hotspot is schematically indicated by arrow 1 ).

[0333] It can be understood that, under the resonance "2", the third current on the second strip conductor 51 and the fourth current on the third strip conductor 52 are opposite in direction. In addition, since the second strip conductor 51 and the third strip conductor 52 are symmetrically structured with respect to the first grounding portion B, the current intensity of the third current is the same as the current intensity of the fourth current. It can be understood that the better the symmetry between the second strip conductor 51 and the third strip conductor 52, the closer the current intensity of the third current is to the current intensity of the fourth current. At this time, the magnetic fields on both sides of the first grounding portion B weaken each other, and the energy of the radiated electromagnetic waves is relatively dispersed. Therefore, although a SAR hotspot appears in the composite antenna under the resonance "2", the SAR value of the resonance "2" (4.78GHz) is also low. It can be understood that the closer the current intensity of the third current is to the current intensity of the fourth current, the lower the SAR value of the resonance "2" (4.78GHz).

[0334] In addition, in this embodiment, the area of ​​the overlapped region of the first projection S1, the second projection S2 and the third projection S3 is 8 square millimeters, the second strip conductor 51 is preferably fed through the first strip conductor 41, and the third strip conductor 52 is preferably fed through the first strip conductor 41. At this time, the third current on the second strip conductor 51 can flow into the circuit board 30 through the first grounding portion B, and the fourth current on the third strip conductor 52 can flow into the circuit board 30 through the first grounding portion B. In this way, the current intensity on the second strip conductor 51 and the third strip conductor 52 is greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor 51 and the third strip conductor 52 is also small, and the SAR value of the resonance "2" (5.34GHz) is low.

[0335] In addition, Table 5 shows the SAR value of the electronic device 100 using the composite antenna provided by the fifth embodiment.

[0336] Table 5

[0337]

[0338] Table 5 shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the fifth embodiment at a distance of 5mm from the back cover is relatively low regardless of resonance "1" or resonance "2". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the fifth embodiment in terms of low SAR value is more obvious. Regardless of resonance "1" or resonance "2", the SAR value at a distance of 5mm from the back cover is less than 0.7.

[0339] In this embodiment, the antenna design scheme provided in the fifth embodiment is to design a composite antenna of a slot antenna and a linear antenna, so that under feeding, the composite antenna respectively excites two resonant modes (the slot antenna differential mode and the linear antenna common mode), thereby achieving wideband coverage while also achieving low SAR values ​​for the two modes, and one of the resonant modes can generate two SAR hotspots.

[0340] It is understandable that the arrangement of the second strip conductor 51 of this embodiment can also refer to the arrangement of the second strip conductor 51 of the second embodiment. The arrangement of the third strip conductor 52 of this embodiment can also refer to the arrangement of the third strip conductor 52 of the second embodiment. No further description is given here.

[0341] The sixth embodiment, the same technical contents as the first to fifth embodiments are not repeated here: please refer to Fig.23 , Fig.23 yes Figure 1The electronic device 100 further includes a fourth strip conductor 53 and a fifth strip conductor 54. The fourth strip conductor 53 is located on the side of the feed part A facing away from the second strip conductor 51. The fifth strip conductor 54 is located on the side of the feed part A facing away from the third strip conductor 52.

[0342] See also Fig.24 , Fig.24 yes Fig.23 The structure diagram of the composite antenna shown in another angle. The fourth strip conductor 53 includes a first end 531 and a second end 532 away from the first end 531. In addition, the fifth strip conductor 54 includes a first end 541 and a second end 542 away from the first end 541. The first end 531 of the fourth strip conductor 53 is connected to the first end 541 of the fifth strip conductor 54.

[0343] In addition, the first end 531 of the fourth strip conductor 53 and the first end 541 of the fifth strip conductor 54 are electrically connected to the second ground portion C of the first strip conductor 41. It can be understood that the first end 531 of the fourth strip conductor 53 and the first end 541 of the fifth strip conductor 54 are electrically connected to the second ground portion C in two embodiments: the first embodiment is that the first end 531 of the fourth strip conductor 53 and the first end 541 of the fifth strip conductor 54 are spaced from the second ground portion C, that is, in the Z-axis direction, there is a height difference between the fourth strip conductor 53 and the first strip conductor 41, and there is a height difference between the fifth strip conductor 54 and the first strip conductor 41. At this time, the RF signal can be fed to the first end 531 of the fourth strip conductor 53 and the first end 541 of the fifth strip conductor 54 at the second ground portion C of the first strip conductor 41 through magnetic field coupling. The second mode is that the first end 531 of the fourth strip conductor 53 and the first end 541 of the fifth strip conductor 54 are connected to the second grounding portion C of the first strip conductor 41, that is, in the Z-axis direction, the fourth strip conductor 53, the fifth strip conductor 54 and the first strip conductor 41 are arranged in the same layer. In this case, the RF signal can be fed to the first end 531 of the fourth strip conductor 53 and the first end 541 of the fifth strip conductor 54 through the second grounding portion C. In this embodiment, the first mode is taken as an example for description.

[0344] In addition, the second end 532 of the fourth strip conductor 53 is an open end, that is, the second end 532 of the fourth strip conductor 53 is not grounded. The second end 542 of the fifth strip conductor 54 is an open end, that is, the second end 542 of the fifth strip conductor 54 is not grounded.

[0345] In this embodiment, the center distance between the first ground portion B and the feeding portion A and the center distance between the second ground portion C and the feeding portion A can refer to the relationship between the first value d1 and the second value d2 of the first embodiment, which will not be described in detail here.

[0346] In addition, the length of the second strip conductor 51 is the first length L1. The length of the third strip conductor 52 is the second length L2. The first length L1 is equal to the second length L2. It can be understood that, when tolerance and error are taken into account, within an allowable range, the first length L1 can be slightly greater than the second length L2, or slightly less than the second length L2. In other words, the first length L1 is substantially equal to the second length L2.

[0347] In addition, the length of the fourth strip conductor 53 is the third length L3. The length of the fifth strip conductor 54 is the fourth length L4. The third length L3 is equal to the fourth length L4. It can be understood that, when tolerance and error are taken into account, within an allowable range, the third length L3 can be slightly greater than the fourth length L4, or slightly less than the fourth length L4. In other words, the third length L3 is substantially equal to the fourth length L4.

[0348] In this embodiment, the sum of the first length L1 and the second length L2 is equal to the sum of the third length L3 and the fourth length L4.

[0349] See also Fig.25 , and combined with Fig.24 As shown, Fig.25 yes Fig.23 The schematic diagram of the projection of the first strip conductor, the second strip conductor and the third strip conductor on the circuit board is shown. The arrangement of the projection S1 of the first strip conductor 41 on the board surface of the circuit board 30, the projection S2 of the second strip conductor 51 on the board surface of the circuit board 30 and the projection S3 of the third strip conductor 52 on the board surface of the circuit board 30 can refer to the arrangement of the first projection S1, the second projection S2 and the third projection S3 of the fifth embodiment. No further description is given here.

[0350] In addition, the projection of the fourth strip conductor 53 on the board surface of the circuit board 30 is a fourth projection S4. The angle between the fourth projection S4 and the first projection S1 is γ. In this embodiment, γ is equal to 90°. In other embodiments, γ may also be equal to 30°, 60°, 125°, 150° or 200°.

[0351] In one embodiment, γ is in the range of 0° to 180°.

[0352] In addition, the projection of the fifth strip conductor 54 on the board surface of the circuit board 30 is a fifth projection S5. The angle between the fifth projection S5 and the first projection S1 is δ. In this embodiment, δ is equal to 90°. In other embodiments, δ may also be in the range of 0° to 180°. For example, δ may also be equal to 30°, 60°, 125°, 150° or 170°.

[0353] In one embodiment, δ is in the range of 0° to 180°.

[0354] Thus, in this embodiment, the fourth strip conductor 53 and the fifth strip conductor 54 are symmetrical with respect to the second ground portion C. In addition, the second strip conductor 51 and the third strip conductor 52 are symmetrical with respect to the feeding portion A and the fourth strip conductor 53 and the fifth strip conductor 54 .

[0355] In addition, the area of ​​the overlapped region of the first projection S1, the fourth projection S4 and the fifth projection S5 is within the range of 0-16 square millimeters, for example, the area of ​​the overlapped region is 0 millimeters, 3 millimeters, 7 millimeters, 10 millimeters or 12 millimeters. In this embodiment, the area of ​​the overlapped region of the first projection S1, the fourth projection S4 and the fifth projection S5 is 8 square millimeters. It can be understood that Fig.25 The overlapping area of ​​the first projection S1, the fourth projection S4 and the fifth projection S5 is schematically shown as a rectangle. However, when the shapes of the first strip conductor 41, the fourth strip conductor 53 and the fifth strip conductor 54 are changed, the overlapping area of ​​the first projection S1, the fourth projection S4 and the fifth projection S5 may also be other shapes, such as an irregular shape or a trapezoid.

[0356] In other embodiments, the area of ​​the overlapping region of the first projection S1 , the fourth projection S4 , and the fifth projection S5 may not be within the range of 0-16 square millimeters.

[0357] The simulation of the composite antenna provided by the sixth embodiment is described below with reference to the accompanying drawings.

[0358] See also Fig.26a , Fig.26a yes Fig.23 The composite antenna shown is a graph of the relationship between the reflection coefficient and the frequency in the frequency band of 3 to 6 GHz. The composite antenna can generate two resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.68 GHz) and resonance "2" (5.38 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" is generated by the common mode of the wire antenna of the composite antenna. It can be understood that, in addition to Fig.26aIn addition to the 3.68 GHz and 5.38 GHz frequency bands shown in the figure, the composite antenna of this embodiment can also generate resonance in other frequency bands (for example, 0 GHz to 3 GHz, 6 GHz to 8 GHz, or 8 GHz to 11 GHz), which can be specifically set by adjusting the size of the first strip conductor 41, or adjusting the size of the second strip conductor 51, or adjusting the size of the third strip conductor 52, or adjusting the size of the fourth strip conductor 53, or adjusting the size of the fifth strip conductor 54, or adjusting the sizes of the first strip conductor 41, the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53 and the fifth strip conductor 54 at the same time.

[0359] The following combination Figure 26b and Fig.26c Let's specifically describe the current distribution of the two resonances of the composite antenna: resonance "1" (3.68 GHz) and resonance "2" (5.38 GHz). Figure 26b yes Fig.23 Schematic diagram of current flow in the composite antenna shown at resonance “1”. Fig.26c yes Fig.23 Schematic diagram of current flow in the antenna at resonance "2".

[0360] See also Figure 26b , the current distribution of resonance “1” (3.68 GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the first end portion 511 of the second strip conductor 51 to the second end portion 512 of the second strip conductor 51 on the second strip conductor 51, a fourth current flowing from the first end portion 521 of the third strip conductor 52 to the second end portion 522 of the third strip conductor 52 on the third strip conductor 52, a fifth current flowing from the first end portion 531 of the fourth strip conductor 53 to the second end portion 532 of the fourth strip conductor 53 on the fourth strip conductor 53, and a sixth current flowing from the first end portion 541 of the fifth strip conductor 54 to the second end portion 542 of the fifth strip conductor 54 in the fifth strip conductor 54. The current intensity of the first strip conductor 41 is greater than the current intensities of the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53, and the fifth strip conductor 54. Thus, the current of the resonance "1" (3.68 GHz) is mainly the current of the first strip conductor 41. In addition, the current of the resonance "1" (3.68 GHz) is the current of the slot antenna differential mode.

[0361] See also Fig.26c, the current distribution of resonance “2” (5.38 GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, a fourth current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52, a fifth current flowing from the second end portion 532 of the fourth strip conductor 53 to the first end portion 531 of the fourth strip conductor 53 on the fourth strip conductor 53, and a sixth current flowing from the second end portion 542 of the fifth strip conductor 54 to the first end portion 541 of the fifth strip conductor 54 in the fifth strip conductor 54. The current intensity of the first strip conductor 41 is smaller than the current intensities of the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53, and the fifth strip conductor 54. Thus, the current of resonance "2" (5.38 GHz) is mainly the current of the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53 and the fifth strip conductor 54. The current of resonance "2" (5.38 GHz) is the current of the common mode of the linear antenna.

[0362] See also Fig.26d , Fig.26d yes Fig.23 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “1”. Fig.26d The SAR value measured at a distance of 5 mm from the back cover 11 to the human tissue is shown. For resonance "1" (3.68 GHz), two SAR hot spots appear at a distance of 5 mm from the back cover 11 (see Figure 1). Fig.26d Two SAR hot spots are simply indicated by arrows 1 and 2).

[0363] It can be understood that, when the composite antenna is at resonance "1", the first current on the first strip conductor 41 is opposite to the direction of the second current. In addition, since the first strip conductor 41 is a symmetrical pattern, the current intensity of the first current is the same as the current intensity of the second current. In this way, the phases of the magnetic field at the feeding part A are opposite, and the amplitudes of the magnetic field are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part A, forming two SAR hotspots on both sides of the feeding part A. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, so the SAR value of resonance "1" (3.68GHz) is relatively low.

[0364] See also Fig.26e , Fig.26e yes Fig.23 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “2”. Fig.26eThe SAR value measured when the human body tissue is 5 mm away from the back cover 11 is shown. For resonance "2" (5.38 GHz), two SAR hot spots also appear at 5 mm from the back cover 11 (see Figure 2). Fig.26e Two SAR hot spots are simply indicated by arrows 1 and 2).

[0365] It can be understood that, under the resonance "2" of the composite antenna, the third current on the second strip conductor 51 is opposite to the fourth current on the third strip conductor 52, and the fifth current on the fourth strip conductor 53 is opposite to the sixth current on the fifth strip conductor 54. In addition, since the second strip conductor 51 and the third strip conductor 54 are symmetrical about the first grounding portion B, the current intensity of the third current is the same as the current intensity of the fourth current. In addition, since the fourth strip conductor 53 and the fifth strip conductor 54 are symmetrical about the second grounding portion C, the current intensity of the fifth current is the same as the current intensity of the sixth current. In addition, the second strip conductor 51 and the third strip conductor 52 are symmetrical about the feeding portion A with the fourth strip conductor 53 and the fifth strip conductor 54. At this time, the phase of the magnetic field at the feeding portion A is opposite, and the amplitude of the magnetic field is roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding portion A, and two SAR hotspots are formed on both sides of the feeding portion A. At this time, the energy of the radiated electromagnetic wave is relatively dispersed, and the SAR value of the resonance "2" (5.38GHz) is also low.

[0366] In addition, the area of ​​the overlapped area of ​​the first projection S1, the second projection S2, and the third projection S3 is 8 square millimeters, the second strip conductor 51 is preferably fed through the first strip conductor 41, and the third strip conductor 52 is preferably fed through the first strip conductor 41. At this time, the third current and the fourth current can flow into the circuit board 30 through the first grounding portion B. In addition, the area of ​​the overlapped area of ​​the first projection S1, the fourth projection S4, and the fifth projection S5 is 8 square millimeters, the fourth strip conductor 53 is preferably fed through the first strip conductor 41, and the fifth strip conductor 54 is preferably fed through the first strip conductor 41. At this time, the fifth current and the sixth current can flow into the circuit board through the second grounding portion C. In this way, the current intensity on the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53, and the fifth strip conductor 54 is greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53 and the fifth strip conductor 54 is also small, and the SAR value of the resonance “2” (5.38 GHz) is also low.

[0367] In addition, Table 6 shows the SAR value of the electronic device 100 using the composite antenna provided in the sixth embodiment.

[0368] Table 6

[0369]

[0370] Table 1 shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the sixth embodiment at a distance of 5mm from the back cover is relatively low regardless of resonance "1" or resonance "2". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the sixth embodiment in terms of low SAR value is more obvious. Regardless of resonance "1" or resonance "2", the SAR value at a distance of 5mm from the back cover is less than 0.5.

[0371] In this embodiment, the antenna design scheme provided in the sixth embodiment is to design a composite antenna of a slot antenna and a linear antenna, so that under feeding, the composite antenna respectively excites two resonant modes (the slot antenna differential mode and the linear antenna common mode). While achieving wideband coverage, it is also possible to achieve two SAR hotspots in both modes, and the SAR values ​​of the two modes are low.

[0372] It is understandable that the arrangement of the second strip conductor 51 of this embodiment can also refer to the arrangement of the second strip conductor 51 of the second embodiment. The arrangement of the third strip conductor 52 of this embodiment can also refer to the arrangement of the third strip conductor 52 of the second embodiment. No further description is given here.

[0373] In other embodiments, the first end portion 531 of the fourth strip conductor 53 is connected to the second ground portion C of the first strip conductor 41 . The first end portion 541 of the fifth strip conductor 54 is connected to the second ground portion C of the first strip conductor 41 .

[0374] The seventh embodiment, the same technical contents as the first to sixth embodiments are not repeated here: please refer to Fig. 27 , Fig. 27 yes Figure 1 A partial structural diagram of another embodiment of a composite antenna of an electronic device is shown. The length of the second strip conductor 51 is the first length L1. The length of the third strip conductor 52 is the second length L2. The first length L1 is equal to the second length L2. The length of the fourth strip conductor 53 is the third length L3. The length of the fifth strip conductor 54 is the fourth length L4. The third length L3 is equal to the fourth length L4. In addition, the sum of the first length L1 and the second length L2 is less than the sum of the third length L3 and the fourth length L4.

[0375] The simulation of the composite antenna provided by the seventh embodiment is described below with reference to the accompanying drawings.

[0376] See also Fig.28a , Fig.28a yes Fig. 27The composite antenna shown is a graph of the relationship between the reflection coefficient and the frequency in the frequency band of 3 to 6 GHz. The composite antenna can generate three resonances in the frequency band of 3 to 6 GHz, resonance "1" (3.62 GHz), resonance "2" (4.95 GHz) and resonance "3" (5.75 GHz). Resonance "1" is generated by the differential mode of the slot antenna of the composite antenna. Resonance "2" and resonance "3" are both generated by the common mode of the wire antenna of the composite antenna. It can be understood that, except for Fig.28a In addition to the frequency bands of 3.62 GHz, 4.95 GHz and 5.75 GHz shown in the figure, the composite antenna of this embodiment can also generate resonance in other frequency bands (for example, 0 GHz to 3 GHz, 6 GHz to 8 GHz, or 8 GHz to 11 GHz), which can be set by adjusting the size of the first strip conductor 41, or adjusting the size of the second strip conductor 51, or adjusting the size of the third strip conductor 52, or adjusting the size of the fourth strip conductor 53, or adjusting the size of the fifth strip conductor 54, or adjusting the sizes of the first strip conductor 41, the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53 and the fifth strip conductor 54 at the same time.

[0377] The following combination Fig.28b , Fig.28c and Fig.28d Let's specifically describe the current distribution of the two resonances of the composite antenna: resonance "1" (3.62GHz), resonance "2" (4.95GHz) and resonance "3" (5.75GHz). Fig.28b yes Fig. 27 Schematic diagram of current flow in the composite antenna shown at resonance “1”. Fig.28c yes Fig. 27 Schematic diagram of current flow in the antenna at resonance "2". Fig.28d yes Fig. 27 Schematic diagram of current flow in the composite antenna shown at resonance “3”.

[0378] See also Fig.28b, the current distribution of resonance “1” (3.62 GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the first end portion 511 of the second strip conductor to the second end portion 512 of the second strip conductor 51 on the second strip conductor 51, a fourth current flowing from the first end portion 521 of the third strip conductor 52 to the second end portion 522 of the third strip conductor 52 on the third strip conductor 52, a fifth current flowing from the first end portion 531 of the fourth strip conductor 53 to the second end portion 532 of the fourth strip conductor 53 on the fourth strip conductor 53, and a sixth current flowing from the first end portion 541 of the fifth strip conductor 54 to the second end portion 542 of the fifth strip conductor 54 in the fifth strip conductor 54. The current intensity of the first strip conductor 41 is greater than the current intensities of the second strip conductor 51, the third strip conductor 52, the fourth strip conductor 53, and the fifth strip conductor 54. Thus, the current of the resonance "1" (3.62 GHz) is mainly the current of the first strip conductor 41. In addition, the current of the resonance "1" (3.62 GHz) is the current of the slot antenna differential mode.

[0379] See also Fig.28c , the current distribution of resonance “2” (4.95 GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, a fourth current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52, a fifth current flowing from the second end portion 532 of the fourth strip conductor 53 to the first end portion 531 of the fourth strip conductor 53 on the fourth strip conductor 53, and a sixth current flowing from the second end portion 542 of the fifth strip conductor 54 to the first end portion 541 of the fifth strip conductor 54 in the fifth strip conductor 54. The current intensities of the first strip conductor 41, the second strip conductor 51, and the third strip conductor 52 are smaller than the current intensities of the fourth strip conductor 53 and the fifth strip conductor 54. Thus, the current of the resonance "2" (4.95 GHz) is mainly the current of the fourth strip conductor 53 and the fifth strip conductor 54. The current of the resonance "2" (4.95 GHz) is the current of the common mode of the linear antenna.

[0380] See also Fig.28d, the current distribution of resonance “3” (5.75 GHz) includes a first current flowing from the first ground portion B to the feeding portion A on the first strip conductor 41 and a second current flowing from the second ground portion C to the feeding portion A, a third current flowing from the second end portion 512 of the second strip conductor 51 to the first end portion 511 of the second strip conductor 51 on the second strip conductor 51, a fourth current flowing from the second end portion 522 of the third strip conductor 52 to the first end portion 521 of the third strip conductor 52 on the third strip conductor 52, a fifth current flowing from the second end portion 532 of the fourth strip conductor 53 to the first end portion 531 of the fourth strip conductor 53 on the fourth strip conductor 53, and a sixth current flowing from the second end portion 542 of the fifth strip conductor 54 to the first end portion 541 of the fifth strip conductor 54 in the fifth strip conductor 54. The current intensities of the first strip conductor 41, the fourth strip conductor 53, and the fifth strip conductor 54 are smaller than the current intensities of the second strip conductor 51 and the third strip conductor 52. Thus, the current of the resonance "3" (5.75 GHz) is mainly the current of the second strip conductor 51 and the third strip conductor 52. The current of the resonance "3" (5.75 GHz) is the current of the common mode of the linear antenna.

[0381] See also Fig.28e , Fig.28e yes Fig. 27 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “1”. Fig.28e The SAR value measured at a distance of 5 mm from the back cover 11 to the human tissue is shown. For resonance "1" (3.62 GHz), two SAR hot spots appear at a distance of 5 mm from the back cover 11 (see Figure 1). Fig.28e Two SAR hotspots are simply illustrated by arrows 1 and 2). It can be understood that, under resonance "1", the first current on the first strip conductor 41 of the composite antenna is opposite to the direction of the second current. In addition, since the first strip conductor 41 is a symmetrical pattern, the current intensity of the first current is the same as the current intensity of the second current. At this time, the phases of the magnetic fields at the feeding part A are opposite, and the amplitudes of the magnetic fields are roughly offset. In this way, the magnetic field is mainly distributed on both sides of the feeding part A, forming two SAR hotspots on both sides of the feeding part A. At this time, the energy of the radiated electromagnetic waves is relatively dispersed, so the SAR value of resonance "1" (3.62GHz) is relatively low.

[0382] See also Figure 28f , Figure 28f yes Fig. 27 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “2”. Figure 28f The SAR value measured at a distance of 5 mm between the human body tissue and the back cover 11 is shown. For resonance "2" (4.95 GHz), a SAR hotspot also appears at a distance of 5 mm between the back cover 11 (see Figure 2). Figure 28f A SAR hotspot is simply indicated by arrow 1). However, the fifth current of the fourth strip conductor 53 and the sixth current of the fifth strip conductor 54 can flow into the circuit board 30 through the second grounding portion C, so that the current intensity on the fourth strip conductor 53 and the fifth strip conductor 54 is greatly weakened. At this time, the magnetic field intensity generated by the fourth strip conductor 53 and the fifth strip conductor 54 is also small. At this time, although a SAR hotspot appears at resonance "2" (4.95GHz), the SAR value of resonance "2" is also low.

[0383] See also Figure 28g , Figure 28g yes Fig. 27 Schematic diagram of SAR hotspot distribution of the composite antenna at resonance “3” is shown. Figure 28g The SAR value measured at a distance of 5 mm between the human body tissue and the back cover 11 is shown. For resonance "3" (5.75 GHz), a SAR hotspot also appears at a distance of 5 mm between the back cover 11 (see Figure 2). Figure 28g A SAR hotspot is simply indicated by arrow 1). However, the third current on the second strip conductor 51 and the fourth current on the third strip conductor 52 can flow into the circuit board 30 through the first grounding portion B, so that the current intensity on the second strip conductor 51 and the third strip conductor 52 is greatly weakened. At this time, the magnetic field intensity generated by the second strip conductor 51 and the third strip conductor 52 is also small. At this time, although a SAR hotspot appears at resonance "3" (5.75 GHz), the SAR value of resonance "3" (5.75 GHz) is low.

[0384] In addition, Table 7 shows the SAR value of the electronic device 100 using the composite antenna provided by the seventh embodiment.

[0385] Table 7

[0386]

[0387] Table 7 shows the SAR value of the 10g standard. It can be seen that when the output power is 24dBm, the SAR value of the electronic device 100 using the composite antenna provided by the seventh embodiment at a distance of 5mm from the back cover is relatively low, regardless of resonance "1", resonance "2" or resonance "3". When the efficiency is normalized to -5dB, the advantage of the composite antenna provided by the seventh embodiment in terms of low SAR value is more obvious. Regardless of resonance "1", resonance "2" or resonance "3", the SAR value at a distance of 5mm from the back cover is less than 0.7.

[0388] In this embodiment, the antenna design scheme provided in the seventh embodiment is to design a composite antenna of a slot antenna and a linear antenna, so that under feeding, the composite antenna respectively excites three resonant modes (differential mode of the slot antenna and common mode of the linear antenna). While achieving wideband coverage, it can also achieve low SAR values ​​of the three modes, and one of the resonant modes can generate two SAR hotspots.

[0389] The above specifically introduces seven implementation methods of the structure of the composite antenna composed of a slot antenna and a linear antenna. It can be understood that each of the above implementation methods can achieve that the composite antenna can excite multiple resonant modes (including the slot antenna differential mode and the linear antenna common mode) respectively, and while achieving broadband coverage, it can also achieve low SAR values ​​for multiple modes.

[0390] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An electronic device, characterized in that: It includes a back cover, a circuit board, a bracket, a radio frequency transceiver circuit, a first antenna and a second antenna, wherein the circuit board and the radio frequency transceiver circuit are located on the same side of the back cover, and the bracket is fixed between the circuit board and the back cover; The first antenna comprises a first strip conductor, the first strip conductor comprises a first grounding portion, a second grounding portion and a feeding portion, the first grounding portion and the second grounding portion are two ends of the first strip conductor respectively, the first grounding portion and the second grounding portion are both grounded through the circuit board, the feeding portion is located between the first grounding portion and the second grounding portion, and is electrically connected to the radio frequency transceiver circuit, and a first gap is formed between the first strip conductor and the circuit board; The second antenna includes a second strip conductor, the second strip conductor includes a first end and a second end, the first end of the second strip conductor is electrically connected to the first grounding portion, the second end of the second strip conductor is an open end, and a second gap is formed between the second strip conductor and the circuit board.

2. The electronic device according to claim 1, characterized in that: The second antenna also includes a third strip conductor, which includes a first end and a second end. The first end of the third strip conductor is electrically connected to the second grounding portion, the second end of the third strip conductor is an open end, and a third gap is formed between the third strip conductor and the circuit board.

3. The electronic device according to claim 2, characterized in that: The electronic device further comprises a bracket, wherein: The first strip conductor is fixed to the bracket; The second strip conductor is fixed to the back cover or the bracket; and The third strip conductor is fixed to the back cover or the bracket.

4. The electronic device according to claim 3, characterized in that: The first gap is formed between the board surface of the circuit board facing the rear cover and the first strip conductor; The second gap is formed between the board surface of the circuit board facing the rear cover and the second strip conductor; and The third gap is formed between the board surface of the circuit board facing the rear cover and the third strip conductor.

5. The electronic device according to claim 2, characterized in that: The projection of the first strip conductor on the surface of the circuit board is a first projection, the projection of the second strip conductor on the surface of the circuit board is a second projection, the angle between the second projection and the first projection is a first angle, and the first angle is in the range of 90° to 270°; the projection of the third strip conductor on the surface of the circuit board is a third projection, the angle between the third projection and the first projection is a second angle, and the second angle is in the range of 90° to 270°.

6. The electronic device according to claim 5, characterized in that: The first angle and the second angle are both equal to 180°, and the length of the second strip conductor is equal to the length of the third strip conductor.

7. The electronic device according to claim 3, characterized in that: The second antenna also includes a third strip conductor, which is fixed to the back cover or the bracket. The third strip conductor includes a first end and a second end. The first end of the third strip conductor is connected to the first end of the second strip conductor, the first end of the third strip conductor is electrically connected to the first grounding portion, and the second end of the third strip conductor is an open end. A clearance area of ​​the second antenna is formed between the board surface of the circuit board facing the back cover and the third strip conductor.

8. The electronic device according to claim 7, characterized in that: The second antenna further includes a fourth strip conductor and a fifth strip conductor, the fourth strip conductor and the fifth strip conductor are both fixed to the back cover or the bracket, a clearance area of ​​the second antenna is formed between the board surface of the circuit board facing the back cover and the fourth strip conductor, and a clearance area of ​​the second antenna is formed between the board surface of the circuit board facing the back cover and the fifth strip conductor; One end of the fourth strip conductor is connected to one end of the fifth strip conductor, the connecting ends of the fourth strip conductor and the fifth strip conductor are electrically connected to the second grounding portion, and an end of the fourth strip conductor away from the fifth strip conductor and an end of the fifth strip conductor away from the fourth strip conductor are both open ends.

9. The electronic device according to claim 8, characterized in that: The sum of the length of the fourth strip conductor and the length of the fifth strip conductor is equal to the sum of the length of the second strip conductor and the third strip conductor.

10. The electronic device according to any one of claims 1 to 9, characterized in that: A center distance between the feed portion and the first ground portion is a first value, a center distance between the feed portion and the second ground portion is a second value, and a ratio of the first value to the second value is in a range of 0.8 to 1.

2.

11. The electronic device according to any one of claims 1 to 9, characterized in that: The first antenna and the second antenna generate a plurality of resonance modes, and the resonance mode of the first antenna generates two SAR hot spots.

12. The electronic device according to any one of claims 1 to 9, characterized in that: The first antenna and the second antenna generate a plurality of resonance modes, and a SAR value of each of the resonance modes is less than 1.

13. The electronic device according to any one of claims 1 to 9, characterized in that: The current excited by the first strip conductor includes a first current flowing from the first ground portion to the feeding portion, and a second current flowing from the second ground portion to the feeding portion.

14. The electronic device according to any one of claims 1 to 9, characterized in that: The current excited by the second strip conductor includes a current flowing from the second end of the second strip conductor to the first end of the second strip conductor.

15. The electronic device according to any one of claims 2 to 9, characterized in that: The first end of the second strip conductor is directly connected to or indirectly coupled to the first ground portion; and / or the first end of the third strip conductor is directly connected to or indirectly coupled to the second ground portion.

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