Antenna and electronic device

Abstract

Embodiments of the present application relate to the technical field of antennas, and provide an antenna and an electronic device. The antenna comprises a first radiator and a second radiator. One of the first radiator and the second radiator has a feed point, and the other one of the first radiator and the second radiator is a parasitic structure. The first radiator comprises a first end and a second end, and the second radiator comprises a third end and a fourth end. The first end, the second end, and the third end are open-circuit ends, the second end and the third end are oppositely arranged, a gap is formed between the second end and the third end, and the first radiator and the second radiator are coupled by means of the gap. When the antenna operates at a preset frequency, the current direction on the first radiator is the same as the current direction on the second radiator. The electrical length of the first radiator is greater than 0.25λ1 and less than or equal to 0.5λ1, wherein λ1 is the dielectric wavelength of the first radiator when the antenna operates at the preset frequency. In this way, the antenna has high radiation efficiency and low specific absorption rate.

Description

Antenna and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410425567.7, filed on April 9, 2024, and entitled "Antenna and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of antennas, in particular to an antenna and an electronic device. BACKGROUND

[0003] In electronic devices such as mobile phones and tablet computers, an antenna is often provided. The antenna can be used for transmitting and receiving radio waves to realize communication functions.

[0004] When the antenna is working, electromagnetic waves will be radiated to the outside. The radiation efficiency of the antenna is a value for measuring the radiation capacity of the antenna, which can be used to represent the efficiency of the antenna. When the active power input to the antenna is constant, the higher the radiation efficiency, the stronger the signal radiated by the antenna to the outside. The specific absorption rate (SAR) of the antenna can be used to represent the size of the radiation of the antenna to the human body. The lower the specific absorption rate, the less the amount of radiation absorbed by the human body when the antenna is working, and the smaller the radiation of the antenna to the human body when the antenna is working.

[0005] In the related art, in order to reduce the specific absorption rate of the antenna, the radiation efficiency of the antenna is often reduced at the same time.

[0006] Therefore, how to reduce the specific absorption rate of the antenna while maintaining a high radiation efficiency of the antenna has become a problem to be solved in the technical field of antennas. SUMMARY

[0007] Embodiments of the present application provide an antenna and an electronic device, which can make the antenna have a high radiation efficiency and a low specific absorption rate.

[0008] The first aspect of the embodiments of the present application provides an antenna, which comprises a first radiator and a second radiator. One of the first radiator and the second radiator has a feed point, and the other of the first radiator and the second radiator is a parasitic structure. The first radiator comprises a first end and a second end, and the second radiator comprises a third end and a fourth end. The first end, the second end and the third end are all open-circuit ends. The second end and the third end are oppositely arranged, and a gap is arranged between the second end and the third end. The first radiator and the second radiator are coupled through the gap. When the antenna works at a preset frequency, the current direction on the first radiator is the same as the current direction on the second radiator. The electrical length of the first radiator is greater than 0.25λ1 and less than or equal to 0.5λ1, where λ1 is the dielectric wavelength of the first radiator when the antenna works at the preset frequency.

[0009] The antenna provided by the embodiment of the present application is characterized in that one of the first radiator and the second radiator is the feeding structure, and the other is the parasitic structure of the feeding structure. When the antenna works at the preset frequency, the power fed into the antenna through the feeding point is distributed to the first radiator and the second radiator to be radiated outward. Compared with the scheme in which the power fed into the antenna through the feeding point is radiated outward through one radiator, the power on each of the first radiator and the second radiator is smaller, the current flowing through each of the first radiator and the second radiator is smaller, and the magnetic field intensity of the electromagnetic wave radiated by each of the first radiator and the second radiator is smaller. Therefore, the electromagnetic wave radiated by the antenna is more dispersed, the magnetic field intensity of the electromagnetic wave radiated by the antenna is less likely to have a larger peak value in a local area, and the specific absorption rate of the antenna is lower. In addition, the distance between the peak position of the magnetic field intensity of the first radiator and the peak position of the magnetic field intensity of the second radiator is farther. When the antenna works at the preset frequency, the superposition effect of the electromagnetic wave radiated by the first radiator and the electromagnetic wave radiated by the second radiator is weaker, and the magnetic field intensity of the electromagnetic wave radiated by the antenna is less likely to have a larger peak value in a local area, and the specific absorption rate of the antenna is lower. Furthermore, when the electrical length of the first radiator is close to 0.5λ1, the current at the peak position of the magnetic field intensity of the first radiator is more balanced with the current at the peak position of the magnetic field intensity of the second radiator, the difference between the magnetic field intensity of the electromagnetic wave radiated at the peak position of the magnetic field intensity of the first radiator and the magnetic field intensity of the electromagnetic wave radiated at the peak position of the magnetic field intensity of the second radiator is smaller, the magnetic field intensity of the electromagnetic wave radiated by the antenna is less likely to have a larger peak value in a local area, and the specific absorption rate of the antenna is lower. Moreover, when the antenna works at the preset frequency, the power fed into the antenna through the feeding point is distributed to the first radiator and the second radiator to be radiated outward, and the current directions on the first radiator and the second radiator are the same. Compared with the scheme in which the power fed into the antenna through the feeding point is radiated outward through one radiator, the loss in the process of radiating outward is smaller, and the radiation efficiency of the antenna can be improved when the active power input into the antenna is constant. In addition, the power fed into the antenna is distributed through the coupling between the first radiator and the second radiator, the structure of the antenna is simpler, and the electrical length of the first radiator is smaller than or equal to 0.5λ1, so that the length of the antenna is shorter.

[0010] In a possible implementation, the antenna further includes a first capacitor. One end of the first capacitor is electrically connected to the first end, and the other end of the first capacitor is used for grounding.

[0011] Therefore, the peak position of the magnetic field intensity of the first radiator and the peak position of the magnetic field intensity of the second radiator can be kept at a larger interval while the length of the first radiator is shortened, and the antenna can be kept at a lower specific absorption rate while the length of the first radiator is shortened, and the antenna can be arranged on an electronic device with a smaller size. In addition, the current at the peak position of the magnetic field intensity of the first radiator with an electrical length less than 0.5λ1 and the peak position of the magnetic field intensity of the second radiator can be balanced when the antenna operates at the preset frequency, and the antenna can be kept at a lower specific absorption rate and a shorter length.

[0012] In a possible implementation, the first capacitor is an adjustable capacitor.

[0013] Therefore, the size of the first capacitor can be adjusted according to the operating frequency of the antenna, and the antenna can be kept at a lower specific absorption rate and a higher radiation efficiency when the antenna operates at different frequencies.

[0014] In a possible implementation, the fourth end is a short-circuit end, and the electrical length of the second radiator is greater than or equal to 0.15λ2 and less than or equal to 0.25λ2, where λ2 is the dielectric wavelength of the second radiator when the antenna operates at the preset frequency.

[0015] Therefore, the length of the second radiator can be shortened on the basis of a lower specific absorption rate and a higher radiation efficiency of the antenna, and the length of the antenna can be shortened, and the antenna can be arranged on an electronic device with a smaller size. In addition, the interval between the peak position of the magnetic field intensity of the first radiator and the peak position of the magnetic field intensity of the second radiator is larger, the electromagnetic radiation energy radiated by the antenna is more dispersed when the antenna operates at the preset frequency, and the superposition effect of the electromagnetic waves radiated by the first radiator and the electromagnetic waves radiated by the second radiator is weaker, and the specific absorption rate of the antenna can be lower.

[0016] In a possible implementation, the first radiator is a parasitic structure, and the second radiator has a feeding point.

[0017] Therefore, the tuning of the antenna is more convenient when the fourth end is a short-circuit end.

[0018] In a possible implementation, the fourth end is an open-circuit end, and the electrical length of the second radiator is greater than 0.25λ2 and less than or equal to 0.5λ2, where λ2 is the dielectric wavelength of the second radiator when the antenna operates at the preset frequency.

[0019] Therefore, the second radiator can have better radiation performance on the basis of a lower specific absorption rate and a higher radiation efficiency of the antenna, and the radiation performance of the antenna can be improved.

[0020] In a possible implementation, the antenna further includes a second capacitor. One end of the second capacitor is electrically connected to the fourth end, and the other end of the second capacitor is configured to be grounded.

[0021] In a possible implementation, the second capacitor is an adjustable capacitor.

[0022] In this way, when the fourth end is an open end, the peak position of the magnetic field intensity of the first radiator and the peak position of the magnetic field intensity of the second radiator can be kept at a larger interval while the length of the second radiator is shortened, thereby facilitating keeping the antenna at a lower specific absorption rate while the length of the second radiator is shortened, and facilitating arranging the antenna on an electronic device with a smaller size.

[0023] The second aspect of the embodiments of the present application provides an electronic device, which includes a radio frequency chip and the antenna according to any one of the above-mentioned embodiments. The radio frequency chip is electrically connected to the feed point of the antenna.

[0024] In a possible implementation, the electronic device includes a frame. The frame includes the first radiator of the antenna and the second radiator of the antenna. That is, the antenna including the first radiator and the second radiator is a frame antenna.

[0025] In this way, the frame antenna with a relatively fixed position can achieve a higher radiation efficiency and a lower specific absorption rate. In addition, the electronic device provided with the frame antenna has a higher integration degree, and the size of the electronic device can be smaller.

[0026] In a possible implementation, the electronic device includes a first housing, a second housing, and a rotating shaft mechanism. The first housing and the second housing are rotationally connected through the rotating shaft mechanism. The first housing includes a first frame, and the first frame includes the first radiator of the antenna and the second radiator of the antenna. The second housing includes a second frame, and the second frame includes a third radiator and a fourth radiator. The third radiator includes a fifth end and a sixth end, and the fourth radiator includes a seventh end and an eighth end. The fifth end, the sixth end, and the seventh end are open ends. The electronic device has a folding state. When the electronic device is in the folding state, the first housing and the second housing are stacked, the third radiator and the first radiator are arranged side by side along the stacking direction of the first housing and the second housing, the fifth end is aligned with the first end of the first radiator, the sixth end is aligned with the second end of the first radiator, the third radiator is coupled to the first radiator, the fourth radiator and the second radiator are arranged side by side along the stacking direction of the first housing and the second housing, the seventh end is aligned with the third end of the second radiator, the eighth end is aligned with the fourth end of the second radiator, and the fourth radiator is coupled to the second radiator.

[0027] Thus, for the electronic device in the folded state, when the antenna works at the preset frequency, the power fed into the antenna through the feeding point can be distributed to the first radiator, the second radiator, the third radiator and the fourth radiator to radiate outward, which can further improve the dispersion of the radiated electromagnetic waves, further reduce the peak value of the magnetic field strength of the radiated electromagnetic waves, and further reduce the specific absorption rate of the electronic device. In addition, for the electronic device in the folded state, when the antenna works at the preset frequency, the first radiator, the second radiator, the third radiator and the fourth radiator can radiate outward, which can further reduce the loss of the active power fed into the antenna to radiate outward, and further improve the radiation efficiency of the antenna. BRIEF DESCRIPTION OF DRAWINGS

[0028] FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present application;

[0029] FIG. 2 is a schematic diagram of another electronic device according to an embodiment of the present application in an unfolded state;

[0030] FIG. 3 is a schematic diagram of the electronic device in FIG. 2 in a folded state;

[0031] FIG. 4 is an exploded schematic diagram of an electronic device according to an embodiment of the present application;

[0032] FIG. 5 is a schematic diagram of another electronic device according to an embodiment of the present application;

[0033] FIG. 6 is a schematic diagram of an antenna according to an embodiment of the present application;

[0034] FIG. 7a is a current distribution diagram of an antenna according to an embodiment of the present application when working at a preset frequency;

[0035] FIG. 7b is a current distribution diagram of an antenna according to an embodiment of the present application when working at a preset frequency;

[0036] FIG. 7c is a current distribution diagram of another antenna according to an embodiment of the present application when working at a preset frequency;

[0037] FIG. 7d is a current distribution diagram of another antenna according to an embodiment of the present application when working at a preset frequency;

[0038] FIG. 7e is a current distribution diagram of another antenna according to an embodiment of the present application when working at a preset frequency;

[0039] FIG. 7f is a current distribution diagram of another antenna according to an embodiment of the present application when working at a preset frequency;

[0040] FIG. 8a is a magnetic field strength curve diagram of the antenna in FIG. 7a when working at a preset frequency;

[0041] FIG. 8b is a magnetic field intensity curve of the antenna in FIG. 7e operating at a preset frequency;

[0042] FIG. 9 is a schematic diagram of another antenna according to an embodiment of the present application;

[0043] FIG. 10 is a schematic diagram of another antenna according to an embodiment of the present application;

[0044] FIG. 11 is a schematic diagram of another antenna according to an embodiment of the present application;

[0045] FIG. 12a is a schematic diagram of a first radiator according to an embodiment of the present application;

[0046] FIG. 12b is a schematic diagram of another first radiator according to an embodiment of the present application;

[0047] FIG. 13 is a schematic diagram of another antenna according to an embodiment of the present application;

[0048] FIG. 14a is a schematic diagram of electric field simulation of an antenna according to an embodiment of the present application;

[0049] FIG. 14b is a schematic diagram of electric field simulation of another antenna according to an embodiment of the present application;

[0050] FIG. 14c is a schematic diagram of electric field simulation of another antenna according to an embodiment of the present application;

[0051] FIG. 15 is a schematic diagram of an inverted F antenna;

[0052] FIG. 16 is a schematic diagram of a slot antenna;

[0053] FIG. 17 is a schematic diagram of another antenna according to an embodiment of the present application;

[0054] FIG. 18 is a schematic diagram of another antenna according to an embodiment of the present application;

[0055] FIG. 19a is a simulation diagram of specific absorption rate of the antenna in FIG. 15;

[0056] FIG. 19b is a simulation diagram of specific absorption rate of the antenna in FIG. 16;

[0057] FIG. 19c is a simulation diagram of specific absorption rate of the antenna in FIG. 17;

[0058] FIG. 19d is a simulation diagram of specific absorption rate of the antenna in FIG. 18;

[0059] FIG. 20 is a comparison diagram of radiation efficiency of the four antennas in FIGS. 15-18;

[0060] FIG. 21 is a comparison diagram of normalized specific absorption rate of the four antennas in FIGS. 15-18;

[0061] FIG. 22 is a schematic diagram of another antenna according to an embodiment of the present application;

[0062] FIG. 23 is a schematic diagram of another electronic device in a folded state according to an embodiment of the present application;

[0063] FIG. 24 is a schematic diagram of another electronic device in a folded state according to an embodiment of the present application;

[0064] FIG. 25 is a schematic diagram of another electronic device in a folded state according to an embodiment of the present application;

[0065] FIG. 26 is a schematic diagram of a comparison of the radiation efficiency of an antenna of an electronic device in a folded state and antennas of two other electronic devices in folded states according to an embodiment of the present application;

[0066] FIG. 27 is a schematic diagram of a comparison of the normalized specific absorption rate of an antenna of an electronic device in a folded state and antennas of two other electronic devices in folded states according to an embodiment of the present application;

[0067] FIG. 28 is a schematic diagram of another electronic device in a folded state according to an embodiment of the present application;

[0068] FIG. 29 is a schematic diagram of another electronic device in a folded state according to an embodiment of the present application.

[0069] Legend: 10, housing; 10a, first housing; 10b, second housing; 20, display screen; 30, rotating shaft mechanism; 40, printed circuit board; 50, antenna; 51, feed point; 60, radio frequency chip; 100, middle frame; 100a, first middle frame; 100b, second middle frame; 110, bezel; 110a, first bezel; 110b, second bezel; 120, middle plate; 200, back cover; 300, first radiator; 310, first end; 320, second end; 400, second radiator; 410, third end; 420, fourth end; 510, first capacitor; 520, second capacitor; 530, third capacitor; 540, fourth capacitor; 600, third radiator; 610, fifth end; 620, sixth end; 700, fourth radiator; 710, seventh end; 720, eighth end; 810, first slot; 820, second slot. DETAILED DESCRIPTION

[0070] The terms used in the embodiments section of the present application are used only to explain specific embodiments of the present application, and are not intended to limit the present application, and the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0071] The electronic device provided in the embodiments of the present application can include, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a point of sales (POS) machine, a personal digital assistant (PDA), a wearable device, a virtual reality device, a Bluetooth speaker / headset, a front-mounted vehicle, a car recorder, a security device, and the like. The embodiments of the present application are described by taking a mobile phone as an example.

[0072] The electronic device provided in the embodiments of the present application is applicable to one or more of the following communication technologies: 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.

[0073] FIG. 1 is a schematic diagram of an electronic device provided in the embodiments of the present application.

[0074] As shown in FIG. 1, in the embodiments of the present application, the electronic device can include a housing 10 and a display screen 20, the display screen 20 is arranged on one side of the housing 10 in the thickness direction, and a space for installing devices can be enclosed between the display screen 20 and the housing 10. The thickness direction of the housing 10 is the same as the thickness direction of the electronic device.

[0075] For example, the housing 10 can include a middle frame 100 and a back cover 200, the back cover 200 is connected to one side of the middle frame 100 in the thickness direction, the display screen 20 is arranged on the other side of the middle frame 100 in the thickness direction, and a space for installing devices can be enclosed between the display screen 20 and the middle frame 100 and between the back cover 200 and the middle frame 100. The thickness direction of the middle frame 100 is the same as the thickness direction of the housing 10.

[0076] For example, the material forming the back cover 200 can include one or more of the following materials: metal, plastic, glass, ceramic, and the like.

[0077] Exemplarily, the back cover 200 can be arranged on the middle frame 100 by means of adhesion, fastener connection, clamping, or the like.

[0078] Exemplarily, the display screen 20 can be arranged on the middle frame 100 by means of adhesion, clamping, or the like.

[0079] In some examples, the electronic device can be a non-foldable device, for example, the electronic device can be a straight bar mobile phone. At this time, the electronic device can include one housing 10.

[0080] FIG. 2 is a schematic view of another electronic device provided by an embodiment of the present application in an unfolded state, and FIG. 3 is a schematic view of the electronic device provided in FIG. 2 in a folded state.

[0081] As shown in FIGS. 2 and 3, in other examples, the electronic device can be a foldable device, and the electronic device has an unfolded state and a folded state, for example, the electronic device can be a foldable mobile phone. At this time, the electronic device can include a plurality of housings 10, and a hinge mechanism 30 is arranged between adjacent two housings 10, and the adjacent two housings 10 are rotationally connected through the hinge mechanism 30 between them, so that the electronic device can be switched between the unfolded state and the folded state. When the electronic device is a foldable device, the display screen 20 can be a flexible screen, and the flexible screen can be attached to the plurality of housings 10, and in the unfolded state of the electronic device, the flexible screen can be located on the same side of the plurality of housings 10.

[0082] Exemplarily, the plurality of housings 10 can include a first housing 10a and a second housing 10b, and a hinge mechanism 30 is arranged between the first housing 10a and the second housing 10b, and the first housing 10a and the second housing 10b are rotationally connected through the hinge mechanism 30 between them, so that the electronic device can be switched between the unfolded state and the folded state. Specifically, the first housing 10a includes a first middle frame 100a and a first back cover 200, and the first back cover 200 is attached to one side in the thickness direction of the first middle frame 100a, and the other side in the thickness direction of the first middle frame 100a is used to arrange the display screen 20, and the second housing 10b includes a second middle frame 100b and a second back cover 200, and the second back cover 200 is attached to one side in the thickness direction of the second middle frame 100b, and the other side in the thickness direction of the second middle frame 100b is used to arrange the display screen 20, and the first middle frame 100a and the second middle frame 100b are rotationally connected through the hinge mechanism 30.

[0083] When the first housing 10a and the second housing 10b are relatively rotated to be stacked with each other, the electronic device is in the folded state, and at this time, the first housing 10a and the second housing 10b can be parallel to each other. It can be understood by those skilled in the art that, due to design tolerances and the like, in the present application, the parallelism between two structural members can not be absolute parallelism, and a small deviation is allowed.

[0084] When the first housing 10a and the second housing 10b are relatively rotated to an included angle of about 180°, the electronic device is in the unfolded state. It can be understood by those skilled in the art that, due to design tolerances and the like, in the present application, the included angle between two structural members of about 180° can not be absolute 180°, and a small deviation is allowed, for example, 165°, 177° or 185°. Of course, the electronic device also has an intermediate state during switching between the folded state and the unfolded state.

[0085] In some examples in which the electronic device is a foldable device, the electronic device can be an inner folding device, and when the electronic device is in the folded state, the display screen 20 is located between the first housing 10a and the second housing 10b.

[0086] In other examples in which the electronic device is a foldable device, the electronic device can be an outer folding device, and when the electronic device is in the folded state, the first housing 10a and the second housing 10b are located between the display screen 20.

[0087] FIG. 4 is an exploded schematic view of an electronic device according to an embodiment of the present application.

[0088] As shown in FIG. 4, in some possible implementations, the middle frame 100 can include a middle plate 120 and a bezel 110, the bezel 110 being fixedly arranged at an outer edge of the middle plate 120, the bezel 110 surrounding the outer periphery of the middle plate 120, the back cover 200 and the display screen 20 being arranged at two ends of the bezel 110 respectively, and a space for mounting devices can be formed between the back cover 200 and the middle plate 120 and between the display screen 20 and the middle plate 120.

[0089] For example, the material forming the bezel 110 can include one or more of aluminum alloy, stainless steel, steel-aluminum composite material, titanium alloy, etc.

[0090] For example, the material forming the middle plate 120 can include one or more of aluminum, aluminum alloy, stainless steel, steel-aluminum composite material, titanium alloy, magnesium alloy, etc.

[0091] Exemplarily, the middle plate 120 and the frame 110 can be connected by clamping, welding, bonding, fastener connection, one-piece forming, etc.

[0092] In the embodiment of the present application, the electronic device further includes a printed circuit board 40 (PCB), which can be used to carry devices and electrically connect different devices, for example, the printed circuit board 40 can be used to carry a processor, a radio frequency chip 60, etc. The processor and the radio frequency chip 60, etc. can be electrically connected through the printed circuit board 40.

[0093] In some examples, the printed circuit board 40 can be arranged between the middle frame 100 and the back cover 200.

[0094] In other examples, the printed circuit board 40 can be arranged between the display screen 20 and the middle frame 100.

[0095] In some examples, the printed circuit board 40 can include a plurality of metal layers, which can include at least one ground layer, which can be used for grounding of devices carried on the printed circuit board 40, and can also be used for grounding of other devices of the electronic device, such as a bracket antenna, a frame antenna, etc. In an embodiment, the ground layer of the printed circuit board 40 can be formed by etching metal on the surface of any one of the dielectric layers of the printed circuit board 40. In an embodiment, the ground layer can be arranged on the side of the printed circuit board 40 close to the middle plate 120. In an embodiment, the edge of the printed circuit board 40 can be regarded as the edge of the ground layer.

[0096] In some examples, the material forming the frame 110 can include metal, which can be used for grounding of devices of the electronic device.

[0097] In some examples, the material forming the middle plate 120 can include metal, which can be used for grounding of devices of the electronic device.

[0098] In some examples, the material forming the back cover 200 can include metal, which can be used for grounding of devices of the electronic device.

[0099] FIG. 5 is a schematic diagram of another electronic device according to an embodiment of the present application.

[0100] As shown in FIG. 5, in the embodiment of the present application, the electronic device includes a radio frequency chip 60 and an antenna 50, the antenna 50 has a feed point 51, and the radio frequency chip 60 is electrically connected to the feed point 51 of the antenna 50.

[0101] The antenna 50 is a device for transmitting or receiving radio waves, and can be used to radiate radio frequency signals to the outside world or receive radio frequency signals from the outside world to realize communication between the electronic device and the outside world. The radio wave is an electromagnetic wave propagating in an unbounded medium (usually free space). The radio frequency chip 60 is used to feed radio frequency signals to the antenna 50 or receive radio frequency signals received by the antenna 50 from the outside world.

[0102] For example, the antenna 50 can include, but is not limited to, a frame antenna, a bracket antenna, a flexible printed circuit (FPC) antenna, a laser-direct-structuring (LDS) antenna, a microstrip disk antenna (MDA) and the like.

[0103] For example, the feed point 51 of the antenna 50 can be electrically connected to the radio frequency chip 60 through the printed circuit board 40. For example, the feed point 51 of the antenna 50 can be electrically connected to the printed circuit board 40 through a metal spring, a wire or the like, so as to be electrically connected to the radio frequency chip 60 electrically connected to the printed circuit board 40 through the printed circuit board 40.

[0104] The radiation efficiency of the antenna 50 is a value for measuring the radiation capability of the antenna 50, and can be used to represent the efficiency of the antenna 50. Specifically, the radiation efficiency refers to the ratio of the power radiated by the antenna 50 to the space (i.e., the power of the part of the electromagnetic wave effectively converted) to the active power input to the antenna 50. When the active power input to the antenna 50 is constant, the higher the radiation efficiency, the stronger the signal radiated by the antenna 50 to the outside world, and the lower the radiation efficiency, the weaker the signal radiated by the antenna 50 to the outside world.

[0105] When the antenna 50 is working, the electromagnetic wave radiated to the outside world will cause radiation to the human body. The specific absorption rate (SAR) of the antenna 50 can be used to represent the size of the radiation of the antenna 50 to the human body when the antenna 50 is working, and is an important index in the electromagnetic radiation safety standard. Specifically, the specific absorption rate refers to the electromagnetic radiation energy absorbed by unit mass of matter per unit time. The lower the specific absorption rate, the less the amount of electromagnetic radiation absorbed by the human body when the antenna 50 is working, and the smaller the radiation of the antenna 50 to the human body when the antenna 50 is working.

[0106] In the related art, in order to reduce the specific absorption rate of the antenna, the radiation efficiency of the antenna is often reduced at the same time. For example, when the common mode (CM) mode is used for the slot antenna, the specific absorption rate of the antenna is low, but the radiation efficiency of the antenna is also low. For another example, when the T-shaped antenna is used and the reverse current is formed on the transverse branch located on both sides of the longitudinal branch, the antenna also has a low specific absorption rate, but the radiation efficiency of the antenna is also low.

[0107] FIG. 6 is a schematic diagram of an antenna according to an embodiment of the present application.

[0108] As shown in FIG. 6, based on this, in the embodiment of the present application, the antenna 50 includes a first radiator 300 and a second radiator 400. One of the first radiator 300 and the second radiator 400 has a feed point 51, and the other of the first radiator 300 and the second radiator 400 is a parasitic structure. The first radiator 300 includes a first end 310 and a second end 320, and the second radiator 400 includes a third end 410 and a fourth end 420. The first end 310, the second end 320, and the third end 410 are all open-circuit ends. Among them, the open-circuit end is not grounded. The second end 320 is oppositely arranged with the third end 410, and the first radiator 300 and the second radiator 400 are coupled through a first gap 810 between the second end 320 and the third end 410. When fed at the feed point 51, one of the first radiator 300 and the second radiator 400 generates a current through the feed, and the other of the first radiator 300 and the second radiator 400 can generate a current through the coupling at the first gap 810.

[0109] When the antenna 50 works at a preset frequency, the current direction on the first radiator 300 is the same as the current direction on the second radiator 400. That is, when the antenna 50 works at the preset frequency, the current on the first radiator 300 flows from the first end 310 to the second end 320, and the current on the second radiator 400 flows from the third end 410 to the fourth end 420, or the current on the first radiator 300 flows from the second end 320 to the first end 310, and the current on the second radiator 400 flows from the fourth end 420 to the third end 410.

[0110] The current direction on the first radiator 300 and the second radiator 400 can be adjusted by adjusting the frequency at which the antenna 50 works. The preset frequency is a frequency at which the antenna 50 works such that the current direction on the first radiator 300 is the same as the current direction on the second radiator 400. For example, the preset frequency can be around 2.16 GHz.

[0111] The current direction on the first radiator 300 mentioned in the present application is the same as the current direction on the second radiator 400, which should be understood as the direction of the main current on the first radiator 300 being the same as the direction of the main current on the second radiator 400.

[0112] The electrical length of the first radiator 300 is greater than 0.25λ1 and less than or equal to 0.5λ1, where λ1 is the dielectric wavelength of the first radiator 300 when the antenna 50 operates at the preset frequency.

[0113] The dielectric wavelength of the first radiator 300 when the antenna 50 operates at the preset frequency refers to the wavelength of the electromagnetic wave formed on the first radiator 300 when the electromagnetic wave propagates in the first radiator 300 when the antenna 50 operates at the preset frequency.

[0114] According to the characteristics of the current and the electric field generated on the first radiator 300, the first radiator 300 has a first peak position, and when the antenna 50 operates at the preset frequency, the current on the first radiator 300 gradually decreases from the first peak position to the first end 310, the current on the first radiator 300 gradually decreases from the first peak position to the second end 320, the electric field on the first radiator 300 gradually increases from the first peak position to the first end 310, and the electric field on the first radiator 300 gradually increases from the first peak position to the second end 320.

[0115] According to the characteristics of the current and the electric field generated on the second radiator 400, the second radiator 400 has a second peak position, and when the antenna 50 operates at the preset frequency, the current on the second radiator 400 gradually decreases from the second peak position to the third end 410, and the electric field on the second radiator 400 gradually increases from the second peak position to the third end 410.

[0116] The magnetic field strength of the electromagnetic wave radiated by the antenna 50 is positively correlated with the size of the current, that is, the position with large current on the antenna 50 radiates electromagnetic wave with large magnetic field strength, and the position with small current on the antenna 50 radiates electromagnetic wave with small magnetic field strength. When the antenna 50 operates at the preset frequency, the first peak position is the peak position of the magnetic field strength of the first radiator 300, and the second peak position is one of the peak positions of the magnetic field strength of the second radiator 400.

[0117] In this way, one of the first radiator 300 and the second radiator 400 is the feeding structure and the other is the parasitic structure of the feeding structure, so that when the antenna 50 operates at the preset frequency, the power fed into the antenna 50 through the feeding point 51 is distributed to the first radiator 300 and the second radiator 400 to be radiated outward. Compared with the scheme that the power fed into the antenna 50 through the feeding point 51 is radiated outward by one radiator, the power on each of the first radiator 300 and the second radiator 400 is smaller, the current flowing on each of the first radiator 300 and the second radiator 400 is smaller, and the magnetic field intensity of the electromagnetic wave radiated by the first radiator 300 and the second radiator 400 is smaller, so that the electromagnetic wave radiated by the antenna 50 is more dispersed, the magnetic field intensity of the electromagnetic wave radiated by the antenna 50 is not prone to have a larger peak value in a local area, and thus the specific absorption rate of the antenna 50 is lower. In addition, the distance between the first peak position of the first radiator 300 and the second peak position of the second radiator 400 is farther, and when the antenna 50 operates at the preset frequency, the superposition effect of the electromagnetic wave radiated by the first radiator 300 and the electromagnetic wave radiated by the second radiator 400 is weaker, so that the magnetic field intensity of the electromagnetic wave radiated by the antenna 50 is not prone to have a larger peak value in a local area, and thus the specific absorption rate of the antenna 50 is lower. In addition, when the antenna 50 operates at the preset frequency, since the power fed into the antenna 50 through the feeding point 51 is distributed to the first radiator 300 and the second radiator 400 to be radiated outward, and the current directions on the first radiator 300 and the second radiator 400 are the same, compared with the scheme that the power fed into the antenna 50 through the feeding point 51 is radiated outward by one radiator, the loss in the process of being radiated outward is smaller, and when the active power input into the antenna 50 is certain, the radiation efficiency of the antenna 50 can be improved. Furthermore, the power fed into the antenna 50 is distributed by the coupling of the first radiator 300 and the second radiator 400, so that the structure of the antenna 50 is simpler, and the electrical length of the first radiator 300 is smaller than or equal to 0.5λ1, so that the length of the antenna 50 is shorter.

[0118] FIG. 7a is a current distribution diagram of an antenna provided by the application when the antenna operates at a preset frequency. The antenna in FIG. 7a includes the second radiator 400 but does not include the first radiator 300, and the current on the second radiator 400 is formed by feeding, and the power fed into the antenna 50 through the feeding point 51 is radiated outward by the second radiator 400.

[0119] Fig. 7b-Fig. 7f are current distribution diagrams of several different antennas working at preset frequencies according to the embodiments of the present application. The antenna 50 in Fig. 7b-Fig. 7f includes a first radiator 300 and a second radiator 400, a current is formed on the second radiator 400 through a feed, a current is formed on the first radiator 300 through coupling with the second radiator 400, and the power fed into the antenna 50 at the feed point 51 is distributed to the first radiator 300 and the second radiator 400 and radiated outward through the first radiator 300 and the second radiator 400. In Fig. 7b, the electrical length of the first radiator 300 is equal to L1, in Fig. 7c, the electrical length of the first radiator 300 is equal to L2, in Fig. 7d, the electrical length of the first radiator 300 is equal to L3, in Fig. 7e, the electrical length of the first radiator 300 is equal to L4, and in Fig. 7f, the electrical length of the first radiator 300 is equal to L5, L1 < L2 < L3 < L4 < L5, and L4 is equal to 0.5λ1.

[0120] As shown in Fig. 7b-Fig. 7f, when the antenna 50 works at a preset frequency, according to the eigenmode analysis of the resonant structure, when the electrical length of the first radiator 300 is less than λ1, the longer the electrical length of the first radiator 300 is, the greater the current on the first radiator 300 is, and the smaller the current on the second radiator 400 is, when the electrical length of the first radiator 300 is close to 0.5λ1, the current at the first peak position of the first radiator 300 is relatively balanced with the current at the second peak position of the second radiator 400, the difference between the magnetic field intensity of the electromagnetic wave radiated at the first peak position and the magnetic field intensity of the electromagnetic wave radiated at the second peak position is small, so that the magnetic field intensity of the electromagnetic wave radiated by the antenna 50 is not easy to have a larger peak value in a local area, which is beneficial to reduce the specific absorption rate of the antenna 50.

[0121] Fig. 8a is a magnetic field intensity curve diagram of the antenna in Fig. 7a working at a preset frequency, and Fig. 8b is a magnetic field intensity curve diagram of the antenna in Fig. 7e working at a preset frequency. In the diagrams, the vertical coordinate is the magnetic field intensity, and the horizontal coordinate is the position in the extension direction of the antenna 50.

[0122] As shown in FIG. 8a, when the antenna 50 in FIG. 7a operates at the preset frequency, the magnetic field strength of the antenna 50 has a peak value, and the magnetic field strength at the peak value is close to 60 A / m. As shown in FIG. 8b, when the antenna 50 in FIG. 7e operates at the preset frequency, the magnetic field strength of the antenna 50 has two peak values, and the magnetic field strength at the two peak values is in the range of 7 A / m to 8 A / m. The values of the magnetic field strength at the two peak values in FIG. 8b are far less than the value of the magnetic field strength at the peak value in FIG. 8a. When the antenna 50 in FIG. 7a operates at the preset frequency, the electromagnetic radiation energy radiated by the antenna 50 is relatively concentrated, and the peak value of the magnetic field strength is relatively large, so that the specific absorption rate of the antenna 50 is relatively high in the local area. When the antenna 50 in FIG. 7e operates at the preset frequency, the electromagnetic radiation energy radiated by the antenna 50 is relatively dispersed, and the peak value of the magnetic field strength is relatively small, so that the specific absorption rate of the antenna 50 is relatively low. In addition, the difference between the values of the magnetic field strength at the two peak values in FIG. 8b is relatively small, the magnetic field strength is relatively balanced, the magnetic field strength at the two peak values is relatively small, and this is beneficial to reduce the specific absorption rate of the antenna 50.

[0123] As shown in FIG. 6, in some possible implementation manners, the fourth end 420 is a short-circuit end, and the short-circuit end is grounded. The electrical length of the second radiator 400 is greater than or equal to 0.15λ2 and less than or equal to 0.25λ2, where λ2 is the dielectric wavelength of the second radiator 400 when the antenna 50 operates at the preset frequency.

[0124] The dielectric wavelength of the second radiator 400 when the antenna 50 operates at the preset frequency refers to the wavelength of the electromagnetic wave formed on the second radiator 400 and propagating in the second radiator 400 when the antenna 50 operates at the preset frequency.

[0125] At this time, according to the characteristics of the current and the electric field generated on the second radiator 400, when the antenna 50 operates at the preset frequency, the second peak value position is located at the fourth end 420, the current on the second radiator 400 gradually decreases from the fourth end 420 to the third end 410, and the electric field on the second radiator 400 gradually increases from the fourth end 420 to the third end 410.

[0126] In this way, on the basis of the low specific absorption rate and the high radiation efficiency of the antenna 50, the length of the second radiator 400 can be relatively short, and then the length of the antenna 50 can be relatively short, which is beneficial to arrange the antenna 50 on an electronic device with a relatively small size. In addition, the distance between the second peak value position and the first peak value position is relatively large, the electromagnetic radiation energy radiated by the antenna 50 when the antenna 50 operates at the preset frequency is relatively dispersed, and the superposition effect of the electromagnetic wave radiated on the first radiator 300 and the electromagnetic wave radiated on the second radiator 400 is relatively weak, and then the specific absorption rate of the antenna 50 can be relatively low.

[0127] The short-circuit end can be grounded by a grounding spring or a grounding wire, etc. The ground can be any ground part in the electronic device, for example, the ground can be a ground layer of the printed circuit board 40, the middle plate 120, the frame 110, the back cover 200, etc.

[0128] For example, the electrical length of the second radiator 400 is 0.25λ2.

[0129] In this way, the distance between the second peak position and the first peak position is large, the electromagnetic radiation energy radiated by the antenna 50 when operating at the preset frequency is relatively dispersed, and the superposition effect of the electromagnetic waves radiated on the first radiator 300 and the electromagnetic waves radiated on the second radiator 400 is weak, so that the specific absorption rate of the antenna 50 is low.

[0130] For example, the electrical length of the second radiator 400 can also be less than 0.25λ2.

[0131] In this way, the length of the second radiator 400 can be shortened, and thus the length of the antenna 50 can be shortened, which is beneficial to arranging the antenna 50 on an electronic device with a small size.

[0132] For ease of tuning, in some examples in which the fourth end 420 is a short-circuit end, the electrical length of the second radiator 400 is greater than or equal to 0.15λ2and less than or equal to 0.25λ2, the first radiator 300 is a parasitic structure, and the second radiator 400 has a feeding point 51. That is, the second radiator 400 is electrically connected to the radio frequency chip 60, and when the antenna 50 operates, the radio frequency chip 60 feeds current to the second radiator 400. After the current is fed to the second radiator 400, the current can be coupled to the first radiator 300 through the first gap 810 to generate parasitic current on the first radiator 300.

[0133] In some examples in which the second radiator 400 has the feeding point 51, the distance from the feeding point 51 to the fourth end 420 is less than the distance from the feeding point 51 to the third end 410.

[0134] FIG. 9 is a schematic diagram of another antenna provided by an embodiment of the present application.

[0135] As shown in FIG. 9, in another example in which the second radiator 400 has the feeding point 51, the distance from the feeding point 51 to the fourth end 420 is greater than the distance from the feeding point 51 to the third end 410.

[0136] FIG. 10 is a schematic diagram of another antenna provided by an embodiment of the present application.

[0137] As shown in FIG. 10, in another example where the fourth end 420 is an open end, the electrical length of the second radiator 400 is greater than 0.25λ 2 and less than or equal to 0.5λ 2, the second radiator 400 is a parasitic structure, and the first radiator 300 has the feed point 51. That is, the first radiator 300 is electrically connected with the RF chip 60, and when the antenna 50 is in operation, the RF chip 60 feeds current to the first radiator 300, and the current can be coupled to the second radiator 400 through the first gap 810 to generate parasitic current on the second radiator 400.

[0138] FIG. 11 is a schematic diagram of another antenna according to an embodiment of the present application.

[0139] As shown in FIG. 11, in some possible implementations, the fourth end 420 is an open end, and the electrical length of the second radiator 400 is greater than 0.25λ 2 and less than or equal to 0.5λ 2.

[0140] At this time, according to the characteristics of the current and the electric field generated on the second radiator 400, when the antenna 50 is in operation at the preset frequency, the second peak position is located between the third end 410 and the fourth end 420, the current on the second radiator 400 gradually decreases from the second peak position to the fourth end 420, and the electric field on the second radiator 400 gradually increases from the second peak position to the fourth end 420.

[0141] In this way, on the basis of the low specific absorption rate and the high radiation efficiency of the antenna 50, the second radiator 400 has good radiation performance, thereby facilitating improvement of the radiation performance of the antenna 50.

[0142] FIG. 12a is a schematic diagram of a first radiator according to an embodiment of the present application, and FIG. 12b is a schematic diagram of another first radiator according to an embodiment of the present application.

[0143] As shown in FIGS. 12a and 12b, when the length of the first radiator 300 away from the second radiator 400 is reduced by a phase difference δφ, the first peak position of the first radiator 300 moves from the original S1 position to the S2 position close to the second radiator 400 by 0.5δφ. To reduce the movement of the first peak position to the second radiator 400 while reducing the length of the first radiator 300, a capacitor can be electrically connected to the end of the first radiator 300 away from the second radiator 400 to compensate for the phase difference reduced due to the reduction of the length of the first radiator 300. The capacitor electrically connected to the first radiator 300 can keep the equivalent length of the first radiator 300 unchanged or increase the equivalent length of the first radiator 300.

[0144] FIG. 13 is a schematic diagram of another antenna according to an embodiment of the present application.

[0145] As shown in FIG. 13, in some possible embodiments, the antenna 50 further includes a first capacitor 510. One end of the first capacitor 510 is electrically connected to the first end 310, and the other end of the first capacitor 510 is grounded. At this time, the electrical length of the first radiator 300 is less than 0.5λ1.

[0146] In this way, the first peak position and the second peak position can be kept at a relatively large interval while the length of the first radiator 300 is shortened, thereby facilitating keeping the antenna 50 at a relatively low specific absorption rate while the length of the first radiator 300 is shortened, and facilitating setting the antenna 50 on an electronic device with a relatively small size. In addition, the current at the first peak position and the second peak position of the first radiator 300 with the electrical length less than 0.5λ1 can be balanced while the antenna 50 operates at the preset frequency, so that the antenna 50 can be kept at a relatively low specific absorption rate and a relatively short length.

[0147] The first capacitor 510 is greater than or equal to 0.5 pf and less than or equal to 10 pf. The specific value of the first capacitor 510 can be determined according to the length of the first radiator 300, the preset frequency, and the interval between the first radiator 300 and the ground, and the like.

[0148] For example, the equivalent length of the first radiator 300 can be equal to 0.5λ1, so that the current on the first radiator 300 and the second radiator 400 can be balanced.

[0149] For example, the first capacitor 510 can be a lumped capacitor or a distributed capacitor.

[0150] FIG. 14a is an electric field simulation diagram of an antenna according to an embodiment of the present application, FIG. 14b is an electric field simulation diagram of another antenna according to an embodiment of the present application, and FIG. 14c is an electric field simulation diagram of another antenna according to an embodiment of the present application. In FIG. 14a, the length of the first radiator 300 of the antenna 50 is greater than the length of the first radiator 300 of the antenna 50 in FIG. 14b, the length of the first radiator 300 of the antenna 50 in FIG. 14b is equal to the length of the first radiator 300 of the antenna 50 in FIG. 14c, and the end of the first radiator 300 away from the second radiator 400 in FIGS. 14a and 14b is not connected to a capacitor, and the end of the first radiator 300 away from the second radiator 400 in FIG. 14c is electrically connected to the first capacitor 510.

[0151] As shown in FIG. 14a, FIG. 14b and FIG. 14c, the distance from the first peak position S2 in FIG. 14b to the second radiator 400 is less than the distance from the first peak position S1 in FIG. 14a to the second radiator 400, the distance from the first peak position S3 in FIG. 14c to the second radiator 400 is less than the distance from the first peak position S1 in FIG. 14a to the second radiator 400, and the first peak position S3 in FIG. 14c is almost in the same position as the first peak position S1 in FIG. 14a.

[0152] FIG. 15 is a schematic diagram of an inverted-F antenna (IFA), FIG. 16 is a schematic diagram of a slot antenna, FIG. 17 is a schematic diagram of another antenna provided by embodiments of the present application, FIG. 18 is a schematic diagram of another antenna provided by embodiments of the present application, FIG. 19a is a simulation diagram of the specific absorption rate of the antenna in FIG. 15, FIG. 19b is a simulation diagram of the specific absorption rate of the antenna in FIG. 16, FIG. 19c is a simulation diagram of the specific absorption rate of the antenna in FIG. 17, and FIG. 19d is a simulation diagram of the specific absorption rate of the antenna in FIG. 18. FIG. 19a, FIG. 19b, FIG. 19c and FIG. 19d are simulation diagrams at a preset frequency of 2.16 GHz. The length of the radiator in FIG. 15 is 20 mm. The length of the left radiator in FIG. 16 is 15 mm, and the length of the right radiator in FIG. 16 is 17 mm. The length of the first radiator 300 in FIG. 17 is 32 mm, and the length of the second radiator 400 in FIG. 17 is 20 mm. The length of the first radiator 300 in FIG. 18 is 25 mm, the length of the second radiator 400 in FIG. 18 is 20 mm, and the size of the first capacitor 510 in FIG. 18 is 1.2 pf.

[0153] In FIG. 19a and FIG. 19b, the specific absorption rate of the antenna 50 has only one peak, and the hot spot is relatively concentrated. In FIG. 19c and FIG. 19d, the specific absorption rate of the antenna 50 has two peaks, and the specific absorption rate of the antenna 50 is relatively dispersed.

[0154] FIG. 20 is a comparison diagram of the radiation efficiency of the four antennas in FIG. 15-FIG. 18. In the diagram, the column chart □ is the radiation efficiency of the antenna 50 in FIG. 15, the column chart □ is the radiation efficiency of the antenna 50 in FIG. 16, the column chart □ is the radiation efficiency of the antenna 50 in FIG. 17, and the column chart □ is the radiation efficiency of the antenna 50 in FIG. 18.

[0155] As shown in FIG. 20, the radiation efficiency of the antenna 50 in FIG. 17 and FIG. 18 is higher than the radiation efficiency of the antenna 50 in FIG. 15 and FIG. 16.

[0156] FIG. 21 is a comparison diagram of the normalized specific absorption rate of the four antennas in FIGS. 15-18. In the diagram, the column chart □ represents the normalized specific absorption rate of the antenna 50 in FIG. 15, the column chart □ represents the normalized specific absorption rate of the antenna 50 in FIG. 16, the column chart □ represents the normalized specific absorption rate of the antenna 50 in FIG. 17, and the column chart □ represents the normalized specific absorption rate of the antenna 50 in FIG. 18.

[0157] As shown in FIG. 21, the normalized specific absorption rate of the antenna 50 in FIGS. 17 and 18 is lower than the normalized specific absorption rate of the antenna 50 in FIGS. 15 and 16.

[0158] In some examples in which the antenna 50 further includes the first capacitor 510, the first capacitor 510 is a tunable capacitor.

[0159] In this way, the size of the first capacitor 510 can be adjusted according to the operating frequency of the antenna 50, so that the antenna 50 can achieve a lower specific absorption rate and a higher radiation efficiency when operating at different frequencies.

[0160] For example, the tunable capacitor can include a plurality of first sub-capacitors connected in parallel, one end of each first sub-capacitor is electrically connected to the ground, and the other end of each first sub-capacitor can be electrically connected to the first end 310 through a switch.

[0161] For example, the tunable capacitor can include a plurality of first sub-capacitors connected in parallel, one end of each first sub-capacitor is electrically connected to the ground, and the other end of each first sub-capacitor can be electrically connected to the first end 310 through a single-pole multi-throw switch.

[0162] In other examples, the electrical length of the first radiator 300 is equal to 0.5λ1.

[0163] In this way, when the first end of the first radiator 300 is not electrically connected to the first capacitor 510, the distance between the first peak position and the second peak position can be larger, the electromagnetic radiation energy radiated by the antenna 50 when operating at the preset frequency can be more dispersed, and the superposition effect of the electromagnetic waves radiated by the first radiator 300 and the second radiator 400 can be weaker, so that the specific absorption rate of the antenna 50 is lower. In addition, it is also beneficial to make the current at the first peak position and the second peak position more balanced, and the difference between the magnetic field strengths at the first peak position and the second peak position smaller when the antenna 50 operates at the preset frequency, which is beneficial to reduce the specific absorption rate of the antenna 50.

[0164] FIG. 22 is a schematic diagram of another antenna provided by an embodiment of the present application.

[0165] As shown in FIG. 22, similar to the first radiator 300, in some examples where the fourth end 420 is an open end, the electrical length of the second radiator 400 is greater than 0.25λ2and less than or equal to 0.5λ2, the antenna 50 further includes a second capacitor 520. One end of the second capacitor 520 is electrically connected to the fourth end 420, and the other end of the second capacitor 520 is connected to the ground. The length of the second radiator 400 is less than 0.5λ2.

[0166] In this way, when the fourth end 420 is an open end, the length of the second radiator 400 can be shortened while the distance between the first peak position and the second peak position is kept large, thereby facilitating keeping the antenna 50 at a low specific absorption rate while the length of the second radiator 400 is shortened, and facilitating arranging the antenna 50 on a small-sized electronic device.

[0167] The second capacitor 520 is greater than or equal to 0.5 pf and less than or equal to 10 pf. The specific value of the second capacitor 520 can be determined according to the length of the second radiator 400, the preset frequency, and the distance between the second radiator 400 and the ground.

[0168] For example, the equivalent length of the second radiator 400 with the fourth end 420 as an open end can be equal to 0.5λ2. In this way, the distance between the first peak position and the second peak position can be large.

[0169] For example, the second capacitor 520 can be a lumped capacitor or a distributed capacitor.

[0170] In some possible implementations, the second capacitor 520 is an adjustable capacitor.

[0171] In this way, the size of the second capacitor 520 can be adjusted according to the operating frequency of the antenna 50, so that the antenna 50 can achieve a low specific absorption rate and a high radiation efficiency at different operating frequencies.

[0172] For example, the adjustable capacitor can include a plurality of second sub-capacitors connected in parallel. One end of each second sub-capacitor is electrically connected to the ground, and the other end of each second sub-capacitor can be electrically connected to the fourth end 420 through a switch.

[0173] For example, the adjustable capacitor can include a plurality of second sub-capacitors connected in parallel. One end of each second sub-capacitor is electrically connected to the ground, and the other end of each second sub-capacitor can be electrically connected to the fourth end 420 through a switch.

[0174] In some examples, the electrical length of the second radiator 400 is equal to 0.5λ2.

[0175] In this way, when the fourth end 420 is an open end, and the second capacitor 520 is not electrically connected to the end of the second radiator 400 far away from the first radiator 300, the interval between the first peak position and the second peak position can be larger, the electromagnetic radiation energy radiated by the antenna 50 when working at the preset frequency can be more dispersed, and the superposition effect of the electromagnetic waves radiated on the first radiator 300 and the electromagnetic waves radiated on the second radiator 400 is weaker, so that the specific absorption rate of the antenna 50 is lower.

[0176] In some possible implementation manners, the antenna 50 is a frame antenna, that is, the frame 110 of the electronic device includes the first radiator 300 of the antenna 50 and the second radiator 400 of the antenna 50. At this time, the material forming the frame 110 can include a conductive material such as metal, the first radiator 300 and the second radiator 400 are formed of the conductive material such as metal, and the first slit 810 can be formed by slitting the frame 110.

[0177] In this way, the frame antenna with a relatively fixed position can achieve higher radiation efficiency and lower specific absorption rate. In addition, the electronic device provided with the frame antenna has higher integration, and the size of the electronic device can be smaller.

[0178] In another possible implementation manner, the back cover 200 can include the first radiator 300 and the second radiator 400 of the antenna 50. Specifically, the edge of the back cover 200 can be formed of metal, and two metal strips can be formed by slitting the edge of the back cover 200, one of the metal strips being the first radiator 300 and the other being the second radiator 400.

[0179] When the electronic device is an un-foldable device, the frame 110 can be a rectangular frame, and the first radiator 300 and the second radiator 400 can be arranged on the long side of the frame 110 or the short side of the frame 110.

[0180] FIG. 23 is a schematic view of another electronic device provided by an embodiment of the present application in a folded state.

[0181] As shown in FIG. 23, in some examples in which the electronic device is a foldable device including a first housing 10a and a second housing 10b, the first housing 10a includes a first bezel 110a, the first bezel 110a including a first radiator 300 of the antenna 50 and a second radiator 400 of the antenna 50. The second housing 10b includes a second bezel 110b, the second bezel 110b including a third radiator 600 and a fourth radiator 700, both of which are parasitic structures. The third radiator 600 includes a fifth end 610 and a sixth end 620, and the fourth radiator 700 includes a seventh end 710 and an eighth end 720, both of which are open-circuit ends. The sixth end 620 is arranged opposite the seventh end 710, and the third radiator 600 and the fourth radiator 700 can be coupled through a second gap 820 between the sixth end 620 and the seventh end 710.

[0182] When the electronic device is in the folded state, the first housing 10a and the second housing 10b are stacked, the third radiator 600 and the first radiator 300 are arranged side by side along a stacking direction of the first housing 10a and the second housing 10b, the fifth end 610 is aligned with the first end 310 of the first radiator 300, the sixth end 620 is aligned with the second end 320 of the first radiator 300, the third radiator 600 is coupled with the first radiator 300, the fourth radiator 700 and the second radiator 400 are arranged side by side along the stacking direction of the first housing 10a and the second housing 10b, the seventh end 710 is aligned with the third end 410 of the second radiator 400, the eighth end 720 is aligned with the fourth end 420 of the second radiator 400, and the fourth radiator 700 is coupled with the second radiator 400. The first gap 810 and the second gap 820 are aligned, and the width of the first gap 810 is equal to the width of the second gap 820.

[0183] When the antenna 50 operates at a preset frequency, the current on the third radiator 600 and the current on the fourth radiator 700 are in the same direction.

[0184] In this way, for the electronic device in the folded state, when the antenna 50 works at the preset frequency, the power fed into the antenna 50 through the feeding point 51 can be distributed to the first radiator 300, the second radiator 400, the third radiator 600 and the fourth radiator 700 to be radiated outward, which can further improve the dispersion of the electromagnetic waves radiated outward, further reduce the peak value of the magnetic field strength of the electromagnetic waves radiated outward, and further reduce the specific absorption rate of the electronic device. In addition, for the electronic device in the folded state, when the antenna 50 works at the preset frequency, the first radiator 300, the second radiator 400, the third radiator 600 and the fourth radiator 700 can be used to radiate outward, which can further reduce the loss of the active power fed into the antenna 50 and radiated outward, and further improve the radiation efficiency of the antenna 50.

[0185] FIG. 24 is a schematic view of another electronic device in a folded state according to an embodiment of the present application.

[0186] As shown in FIG. 24, in the example in which the fourth end 420 is a short-circuit end, the eighth end 720 is a short-circuit end.

[0187] FIG. 25 is a schematic view of another electronic device in a folded state according to an embodiment of the present application.

[0188] As shown in FIG. 25, in the example in which the first end 310 is electrically connected to the first capacitor 510, the fifth end 610 is electrically connected to the third capacitor 530, one end of the third capacitor 530 is electrically connected to the fifth end 610, and the other end of the third capacitor 530 is used for grounding. The third capacitor 530 is the same capacitor as the first capacitor 510.

[0189] FIG. 26 is a schematic view of the radiation efficiency of the antenna of an electronic device in a folded state compared with the radiation efficiency of the antenna of two other electronic devices in a folded state according to an embodiment of the present application. In the figure, the column chart □ represents the radiation efficiency at the two inverted-F antennas of an electronic device including two parallel inverted-F antennas, one of which is fed and the other of which is parasitic, the column chart □ represents the radiation efficiency at the antenna 50 of the electronic device in FIG. 25, and the column chart □ represents the radiation efficiency at the two slot antennas of an electronic device including two parallel slot antennas, one of which is fed and the other of which is parasitic.

[0190] As shown in FIG. 26, the radiation efficiency at the antenna 50 of the electronic device in FIG. 25 is higher than the radiation efficiency at the antenna 50 of the other two electronic devices.

[0191] FIG. 27 is a normalized specific absorption rate comparison diagram of the antenna of the electronic device provided in an embodiment of the present application in a folded state and the antennas of two other electronic devices in folded states. In the diagram, the column chart represents the normalized specific absorption rate at the two inverted-F antennas of the electronic device including two parallel inverted-F antennas, one of which is fed and the other of which is parasitic, the column chart represents the normalized specific absorption rate at the antenna 50 of the electronic device in FIG. 25, and the column chart represents the normalized specific absorption rate at the two slot antennas of the electronic device including two parallel slot antennas, one of which is fed and the other of which is parasitic.

[0192] As shown in FIG. 27, the normalized specific absorption rate at the antenna 50 of the electronic device in FIG. 25 is lower than the normalized specific absorption rate at the antenna 50 of the other two electronic devices.

[0193] FIG. 28 is a diagram of yet another electronic device provided in an embodiment of the present application in a folded state.

[0194] As shown in FIG. 28, in the example in which the fourth end 420 is an open end, the eighth end 720 is an open end.

[0195] FIG. 29 is a diagram of yet another electronic device provided in an embodiment of the present application in a folded state.

[0196] As shown in FIG. 29, in the example in which the fourth end 420 is electrically connected to the second capacitor 520, the eighth end 720 is electrically connected to a fourth capacitor 540, one end of the fourth capacitor 540 is electrically connected to the eighth end 720, the other end of the fourth capacitor 540 is used for grounding, and the fourth capacitor 540 is the same capacitor as the second capacitor 520.

[0197] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0198] In the embodiments of the present application or the devices or elements implied by the embodiments of the present application must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specified.

[0199] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, and above-described drawings, if any, are used to distinguish between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so construed herein can be interchanged, under appropriate circumstances, and that the embodiments of the present application described herein are capable of

[0200] The term "a plurality" or "a plurality of" means two or more. The term "and / or" herein is merely an associative relationship of the associated objects, and means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally means that the front and rear associated objects are in an "or" relationship; in the formula, the character " / " means that the front and rear associated objects are in a "division" relationship.

[0201] It can be understood that various numerical numbers involved in the embodiments of the present application are only for convenient differentiation, and do not limit the scope of the embodiments of the present application.

[0202] It can be understood that the size of the serial number of each process in the embodiments of the present application does not mean the execution order, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. An antenna, characterized in that: including a first radiator and a second radiator; One of the first radiator and the second radiator has a feeding point, and the other of the first radiator and the second radiator is a parasitic structure; The first radiator includes a first end and a second end, and the second radiator includes a third end and a fourth end; The first end, the second end, and the third end are all open ends, the second end is arranged opposite to the third end, a gap is formed between the second end and the third end, and the first radiator and the second radiator are coupled through the gap; When the antenna operates at a preset frequency, the direction of the current on the first radiator is the same as the direction of the current on the second radiator; The electrical length of the first radiator is greater than 0.25λ1 and less than or equal to 0.5λ1, where λ1 is the dielectric wavelength of the first radiator when the antenna operates at the preset frequency.

2. The antenna according to claim 1, wherein Also comprising a first capacitor; One end of the first capacitor is electrically connected to the first end, and the other end of the first capacitor is grounded.

3. The antenna according to claim 2, wherein: The first capacitor is an adjustable capacitor.

4. The antenna according to any one of claims 1 to 3, characterized in that: The fourth end is a short-circuit end, and the electrical length of the second radiator is greater than or equal to 0.15λ2 and less than or equal to 0.25λ2, where λ2 is the dielectric wavelength of the second radiator when the antenna operates at the preset frequency.

5. The antenna according to claim 4, characterized in that The first radiator is a parasitic structure, and the second radiator has the feeding point.

6. The antenna according to any one of claims 1 to 3, characterized in that: The fourth end is an open end, and the electrical length of the second radiator is greater than 0.25λ2 and less than or equal to 0.5λ2, where λ2 is the dielectric wavelength of the second radiator when the antenna operates at the preset frequency.

7. The antenna according to claim 6, characterized in that Also including a second capacitor; One end of the second capacitor is electrically connected to the fourth end, and the other end of the second capacitor is grounded.

8. The antenna according to claim 7, characterized in that The second capacitor is an adjustable capacitor.

9. An electronic device, characterized in that: Comprising a radio frequency chip and the antenna according to any one of claims 1 to 8; The radio frequency chip is electrically connected to the feeding point of the antenna.

10. The electronic device according to claim 9, wherein Includes borders; The frame includes a first radiator of the antenna and a second radiator of the antenna.

11. The electronic device according to claim 9, wherein The device comprises a first shell, a second shell and a rotating shaft mechanism, wherein the first shell and the second shell are rotatably connected via the rotating shaft mechanism; The first housing includes a first frame, and the first frame includes a first radiator of the antenna and a second radiator of the antenna; The second housing includes a second frame, the second frame includes a third radiator and a fourth radiator, the third radiator includes a fifth end and a sixth end, the fourth radiator includes a seventh end and an eighth end, and the fifth end, the sixth end, and the seventh end are all open ends; The electronic device has a folded state; When the electronic device is in the folded state, the first shell and the second shell are stacked, the third radiator and the first radiator are arranged side by side along the stacking direction of the first shell and the second shell, the fifth end is aligned with the first end of the first radiator, the sixth end is aligned with the second end of the first radiator, the third radiator is coupled to the first radiator, the fourth radiator and the second radiator are arranged side by side along the stacking direction of the first shell and the second shell, the seventh end is aligned with the third end of the second radiator, the eighth end is aligned with the fourth end of the second radiator, and the fourth radiator is coupled to the second radiator.

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