Antenna and electronic equipment

Abstract

The embodiment of the invention provides an antenna and electronic equipment, and relates to the technical field of antennas. The antenna comprises a first radiator and a second radiator. One of the first radiator and the second radiator is provided with a feeding point, and the other one of the first radiator and the second radiator is of 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, 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 works at a preset frequency, the current direction of the first radiator is the same as the current direction of the second radiator. The electrical length of the first radiator is larger than 0.25 lambda 1 and smaller than or equal to 0.5 lambda 1, and lambda 1 is the dielectric wavelength of the first radiator when the antenna works at the preset frequency. Therefore, the antenna has relatively high radiation efficiency and relatively low specific absorption rate.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of antennas, and in particular, to an antenna and an electronic device. BACKGROUND

[0002] An antenna is often provided in an electronic device such as a mobile phone or a tablet computer, and can be used for transmitting and receiving radio waves to implement a communication function.

[0003] When the antenna is working, electromagnetic waves are radiated to the outside. The radiation efficiency of the antenna is a value for measuring the radiation capability of the antenna, and 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.

[0004] 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.

[0005] 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

[0006] 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.

[0007] A first aspect of embodiments of the present application provides an antenna, which includes 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 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-circuit ends. The second end and the third end are oppositely arranged, and a gap is provided 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.

[0008] The antenna provided by the embodiment of the present application is characterized in that one of the first radiator and the second radiator is a feeding structure, and the other is a parasitic structure of the feeding structure. When the antenna operates at a 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 by one radiator, the power on the first radiator and the second radiator is smaller, the current flowing through the first radiator and the second radiator is smaller, the magnetic field intensity of the electromagnetic wave radiated by the first radiator and the second radiator is smaller, the electromagnetic wave radiated by the whole antenna is more dispersed, the magnetic field intensity of the electromagnetic wave radiated by the antenna is not prone to have a larger peak value in a local area, and thus 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, the superposition effect of the electromagnetic wave radiated by the first radiator and the electromagnetic wave radiated by the second radiator is weaker when the antenna operates at the preset frequency, the magnetic field intensity of the electromagnetic wave radiated by the antenna is not prone to have a larger peak value in a local area, and thus 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 not prone to have a larger peak value in a local area, and thus the specific absorption rate of the antenna is lower. Moreover, when the antenna operates 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 by 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 certain. In addition, the power fed into the antenna is distributed by the coupling of 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.

[0009] 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.

[0010] 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.

[0011] In a possible implementation, the first capacitor is an adjustable capacitor.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] In a possible implementation, the first radiator is a parasitic structure, and the second radiator has a feeding point.

[0016] Therefore, the tuning of the antenna is more convenient when the fourth end is a short-circuit end.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] In a possible implementation, the second capacitor is an adjustable capacitor.

[0021] 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.

[0022] A 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 embodiments. The radio frequency chip is electrically connected to the feed point of the antenna.

[0023] 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.

[0024] 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.

[0025] In a possible implementation, the electronic device includes a first housing, a second housing, and a hinge mechanism. The first housing and the second housing are rotationally connected through the hinge 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 folded state. When the electronic device is in the folded 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.

[0026] 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 feed 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 active power fed into the antenna to radiate outward, and further improve the radiation efficiency of the antenna. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A schematic diagram of an electronic device provided by an embodiment of the present application;

[0028] Figure 2 A schematic diagram of another electronic device provided by an embodiment of the present application in an unfolded state;

[0029] Figure 3 A schematic diagram of an electronic device provided by an embodiment of the present application in a folded state; Figure 2 A schematic diagram of an electronic device provided by an embodiment of the present application in a folded state;

[0030] Figure 4 A schematic diagram of an electronic device provided by an embodiment of the present application;

[0031] Figure 5 A schematic diagram of another electronic device provided by an embodiment of the present application;

[0032] Figure 6 A schematic diagram of an antenna provided by an embodiment of the present application;

[0033] Figure 7a A current distribution diagram of an antenna provided by an embodiment of the present application when the antenna works at a preset frequency;

[0034] Figure 7b A current distribution diagram of an antenna provided by an embodiment of the present application when the antenna works at a preset frequency;

[0035] Figure 7c A current distribution diagram of another antenna provided by an embodiment of the present application when the antenna works at a preset frequency;

[0036] Figure 7d A current distribution diagram of another antenna provided by an embodiment of the present application when the antenna works at a preset frequency;

[0037] Figure 7e A current distribution diagram of another antenna provided by an embodiment of the present application when the antenna works at a preset frequency;

[0038] Figure 7f A current distribution diagram of the antenna in the embodiment of the present application when working at a preset frequency;

[0039] Figure 8a A magnetic field intensity curve diagram of the antenna in the embodiment of the present application when working at a preset frequency; Figure 7a

[0040] Figure 8b A magnetic field intensity curve diagram of the antenna in the embodiment of the present application when working at a preset frequency; Figure 7e

[0041] Figure 9 A schematic diagram of another antenna provided by the embodiment of the present application;

[0042] Figure 10 A schematic diagram of another antenna provided by the embodiment of the present application;

[0043] Figure 11 A schematic diagram of another antenna provided by the embodiment of the present application;

[0044] Figure 12a A schematic diagram of a first radiator provided by the embodiment of the present application;

[0045] Figure 12b A schematic diagram of another first radiator provided by the embodiment of the present application;

[0046] Figure 13 A schematic diagram of another antenna provided by the embodiment of the present application;

[0047] Figure 14a A schematic diagram of an electric field simulation of an antenna provided by the embodiment of the present application;

[0048] Figure 14b A schematic diagram of an electric field simulation of another antenna provided by the embodiment of the present application;

[0049] Figure 14c A schematic diagram of an electric field simulation of another antenna provided by the embodiment of the present application;

[0050] Figure 15 A schematic diagram of an inverted F antenna;

[0051] Figure 16 A schematic diagram of a slot antenna;

[0052] Figure 17 A schematic diagram of another antenna provided by the embodiment of the present application;

[0053] Figure 18 A schematic diagram of another antenna provided by the embodiment of the present application;

[0054] Figure 19a A schematic diagram of another antenna provided by the embodiment of the present application;​​Figure 15 Simulation diagram of specific absorption rate of the antenna in FIG. 1;

[0055] Figure 19b FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application; Figure 16 Simulation diagram of specific absorption rate of the antenna in FIG. 1;

[0056] Figure 19c FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application; Figure 17 Simulation diagram of specific absorption rate of the antenna in FIG. 1;

[0057] Figure 19d FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application; Figure 18 Simulation diagram of specific absorption rate of the antenna in FIG. 1;

[0058] Figure 20 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application; Figures 15 to 18 Comparison diagram of radiation efficiency of four antennas in FIG. 1;

[0059] Figure 21 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application; Figures 15 to 18 Comparison diagram of normalized specific absorption rate of four antennas in FIG. 1;

[0060] Figure 22 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application;

[0061] Figure 23 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application;

[0062] Figure 24 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application;

[0063] Figure 25 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application;

[0064] Figure 26 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application;

[0065] Figure 27 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application;

[0066] Figure 28 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application;

[0067] Figure 29 FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present application.

[0068] BRIEF DESCRIPTION OF THE DRAWINGS

[0069] 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;

[0070] 100, middle frame; 100a, first middle frame; 100b, second middle frame; 110, frame; 110a, first frame; 110b, second frame; 120, middle plate;

[0071] 200, back cover;

[0072] 300, first radiator; 310, first end; 320, second end;

[0073] 400, second radiator; 410, third end; 420, fourth end;

[0074] 510, first capacitor; 520, second capacitor; 530, third capacitor; 540, fourth capacitor;

[0075] 600, third radiator; 610, fifth end; 620, sixth end;

[0076] 700, fourth radiator; 710, seventh end; 720, eighth end;

[0077] 810, first gap; 820, second gap. DETAILED DESCRIPTION

[0078] The terms used in the embodiments of the present application are only used to explain the 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.

[0079] The electronic device provided by 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 / earphone, a front-mounted vehicle, a driving recorder, a security device, and the like. The embodiments of the present application take the mobile phone as an example for illustration.

[0080] The electronic device provided in the embodiments of the present application is suitable for adopting 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.

[0081] Figure 1 A schematic diagram of an electronic device provided in an embodiment of the present application.

[0082] like Figure 1 As shown, in an embodiment of the present application, the electronic device may include a housing 10 and a display screen 20. The display screen 20 is disposed on one side of the housing 10 in the thickness direction, and a space for mounting components may be defined 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.

[0083] For example, the housing 10 may include a middle frame 100 and a back cover 200. The back cover 200 covers one side of the middle frame 100 in the thickness direction, and the display 20 is disposed on the other side of the middle frame 100 in the thickness direction. Spaces for mounting components may be defined between the display 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.

[0084] For example, the material forming the back cover 200 may include one or more of the following materials: metal, plastic, glass, ceramic, etc.

[0085] For example, the back cover 200 can be set on the middle frame 100 by bonding, fastener connection, snap connection, etc.

[0086] For example, the display screen 20 may be set on the middle frame 100 by bonding, snapping, or the like.

[0087] In some examples, the electronic device may be a non-foldable device, for example, a bar phone. In this case, the electronic device may include a housing 10 .

[0088] Figure 2This is a schematic diagram of another electronic device in an unfolded state provided by an embodiment of the present application. Figure 3 for Figure 2 A schematic diagram of an electronic device in a folded state is provided.

[0089] like Figure 2 、 Figure 3 As shown, 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. In this case, the electronic device can include multiple housings 10, and a hinge mechanism 30 is provided between two adjacent housings 10. The two adjacent housings 10 are rotatably connected by the hinge mechanism 30 between them, so that the electronic device can switch 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 covered on multiple housings 10. When the electronic device is in the unfolded state, the flexible screen can be located on the same side of the multiple housings 10.

[0090] Exemplarily, the multiple shells 10 may include a first shell 10a and a second shell 10b, with a hinge mechanism 30 provided between the first shell 10a and the second shell 10b. The first shell 10a and the second shell 10b are rotatably connected by the hinge mechanism 30 therebetween, so that the electronic device can switch between an unfolded state and a folded state. Specifically, the first shell 10a includes a first middle frame 100a and a first back cover 200. The first back cover 200 covers one side of the first middle frame 100a in the thickness direction, and the other side of the first middle frame 100a in the thickness direction is used to set the display screen 20. The second shell 10b includes a second middle frame 100b and a second back cover 200. The second back cover 200 covers one side of the second middle frame 100b in the thickness direction, and the other side of the second middle frame 100b in the thickness direction is used to set the display screen 20. The first middle frame 100a and the second middle frame 100b are rotatably connected by the hinge mechanism 30.

[0091] When the first housing 10a and the second housing 10b are rotated relative to each other and stacked, the electronic device is in a folded state. At this time, the first housing 10a and the second housing 10b can be parallel to each other. Those skilled in the art will understand that due to design tolerances and other reasons, in this application, the parallelism between the two structural members may not be absolutely parallel, and a slight deviation is allowed.

[0092] When the first housing 10a and the second housing 10b are rotated relative to each other until the angle between them is approximately 180°, the electronic device is in the unfolded state. Those skilled in the art will appreciate that, due to design tolerances and other factors, the angle between the two structural members in this application, which is approximately 180°, may not be an absolute 180° angle, and slight deviations, such as 165°, 177°, or 185°, are permitted. Of course, the electronic device also has intermediate states during the transition between the folded and unfolded states.

[0093] In some examples where the electronic device is a foldable device, the electronic device may be an inward-folding device. When the electronic device is in a folded state, the display screen 20 is located between the first shell 10a and the second shell 10b.

[0094] In other examples where the electronic device is a foldable device, the electronic device may be an outward-folding device. When the electronic device is in a folded state, the first shell 10 a and the second shell 10 b are located between the display screen 20 .

[0095] Figure 4 This is a schematic diagram of an explosion of an electronic device provided in an embodiment of the present application.

[0096] like Figure 4 As shown, in some possible embodiments, the middle frame 100 may include a middle plate 120 and a frame 110, the frame 110 is fixedly arranged at the outer edge of the middle plate 120, and the frame 110 surrounds the outer circumference of the middle plate 120. The back cover 200 and the display screen 20 are respectively arranged at both ends of the frame 110, and space for installing 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.

[0097] Exemplarily, the material forming the frame 110 may include one or more of the following materials: metal, ceramic, glass, plastic, etc. For example, the material forming the frame 110 may include one or more of aluminum alloy, stainless steel, steel-aluminum composite material, titanium alloy, etc.

[0098] Exemplarily, the material forming the middle plate 120 may include one or more of the following materials: metal, plastic, etc. For example, the material forming the middle plate 120 may include one or more of aluminum, aluminum alloy, stainless steel, steel-aluminum composite material, titanium alloy, magnesium alloy, etc.

[0099] For example, the middle plate 120 and the frame 110 may be connected by means of snap connection, welding, bonding, fastener connection, integral molding, etc.

[0100] In the embodiments 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 and the like, and the processor and the radio frequency chip 60 and the like can be electrically connected through the printed circuit board 40.

[0101] In some examples, the printed circuit board 40 can be arranged between the middle frame 100 and the back cover 200.

[0102] In other examples, the printed circuit board 40 can be arranged between the display screen 20 and the middle frame 100.

[0103] 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 and the like. 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.

[0104] In some examples, the material forming the frame 110 can include metal, which can be used for grounding of devices of the electronic device.

[0105] 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.

[0106] 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.

[0107] Figure 5 Another schematic diagram of an electronic device provided in the embodiments of the present application.

[0108] As shown in Figure 5 In the embodiments 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 with the feed point 51 of the antenna 50.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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 advantages and disadvantages of 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.

[0113] 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.

[0114] 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 can be 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.

[0115] Figure 6 A schematic diagram of an antenna is provided for an embodiment of the present application.

[0116] As Figure 6 shown, 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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 the first radiator 300 and the second radiator 400 is smaller, the current flowing on the first radiator 300 and the second radiator 400 is smaller, the magnetic field intensity of the electromagnetic wave radiated on 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 easy to appear 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 far, when the antenna 50 operates at the preset frequency, the superposition effect of the electromagnetic wave radiated on the first radiator 300 and the electromagnetic wave radiated on the second radiator 400 is weaker, so that the magnetic field intensity of the electromagnetic wave radiated by the antenna 50 is not easy to appear 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 radiating 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.

[0126] Figure 7a The current distribution diagram of the antenna provided in the application when the antenna operates at the preset frequency. Figure 7a The antenna in the application includes the second radiator 400 and does not include the first radiator 300, 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.

[0127] Figures 7b to 7f The current distribution diagrams of several different antennas provided in the application when the antennas operate at the preset frequency. Figures 7b to 7fThe antenna 50 includes a first radiator 300 and a second radiator 400. The second radiator 400 generates a current by feeding, and the first radiator 300 generates a current by coupling with the second radiator 400. The power fed into the antenna 50 by the feeding 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. Figure 7b The electrical length of the first radiator 300 is equal to L1, Figure 7c The electrical length of the first radiator 300 is equal to L2, Figure 7d The electrical length of the first radiator 300 is equal to L3, Figure 7e The electrical length of the first radiator 300 is equal to L4, Figure 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.

[0128] like Figures 7b to 7f As shown, when the antenna 50 operates at a preset frequency, according to the characteristic mode 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, the greater the current on the first radiator 300, and the smaller the current on the second radiator 400. When the electrical length of the first radiator 300 is near 0.5λ1, the current at the first peak position of the first radiator 300 and the current at the second peak position of the second radiator 400 are relatively balanced, and the difference between the magnetic field strength of the electromagnetic wave radiated at the first peak position and the magnetic field strength of the electromagnetic wave radiated at the second peak position is small, so that the magnetic field strength of the electromagnetic wave radiated by the antenna 50 is not easy to have a large peak locally, which is beneficial to reducing the specific absorption rate of the antenna 50.

[0129] Figure 8a for Figure 7a The magnetic field strength curve when the antenna works at the preset frequency, Figure 8b for Figure 7e Magnetic field strength curve diagram when the antenna in FIG. 5 is working at a preset frequency. In the figure, the ordinate is the magnetic field strength and the abscissa is the position in the extending direction of the antenna 50.

[0130] like Figure 8a As shown, Figure 7a When the antenna 50 in FIG. 1 is operated at a 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 60A / m. Figure 8b As shown, Figure 7e When the antenna 50 in FIG. 5 operates at a preset frequency, the magnetic field strength of the antenna 50 has two peaks, and the magnetic field strengths at the two peaks are both within the range of 7 A / m to 8 A / m. Figure 8b The two peak values ​​of the magnetic field intensity are much smaller than Figure 8aThe value of the magnetic field strength at the peak value. Figure 7a When the antenna 50 operates at a preset frequency, the electromagnetic radiation energy radiated is relatively concentrated and the peak value of the magnetic field intensity is relatively large, so that the local specific absorption rate of the antenna 50 is relatively high. Figure 7e When the antenna 50 in the embodiment works at a preset frequency, the electromagnetic radiation energy radiated is relatively dispersed, the peak value of the magnetic field intensity is relatively small, and the specific absorption rate of the antenna 50 is relatively low. Figure 8b The difference between the values ​​of the two peak values ​​of the magnetic field strength in the antenna 50 is small, the magnetic field strength is relatively balanced, and the magnetic field strength at the two peak values ​​is small, which is conducive to reducing the specific absorption rate of the antenna 50.

[0131] like Figure 6 As shown, in some possible implementations, the fourth end 420 is a short-circuit end, wherein 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 a predetermined frequency.

[0132] The dielectric wavelength of the second radiator 400 when the antenna 50 operates at a preset frequency refers to the wavelength of the electromagnetic wave generated on the second radiator 400 when the antenna 50 operates at the preset frequency and propagates in the second radiator 400 .

[0133] At this time, according to the characteristics of the current and electric field generated on the second radiator 400, when the antenna 50 operates at a preset frequency, the second peak 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.

[0134] Thus, while antenna 50 has a low specific absorption rate and high radiation efficiency, the length of second radiator 400 can be shortened, and thus the length of antenna 50 can be shortened, facilitating placement of antenna 50 on smaller electronic devices. Furthermore, the larger distance between the second peak position and the first peak position allows the electromagnetic radiation energy radiated by antenna 50 to be more dispersed when operating at a preset frequency, and the superposition effect between the electromagnetic waves radiated by first radiator 300 and second radiator 400 is less, thereby achieving a lower specific absorption rate for antenna 50.

[0135] The short-circuit end can be grounded via a grounding spring or a grounding wire, etc. The ground can be any grounding location in the electronic device, for example, the ground can be the grounding layer of the printed circuit board 40, the middle plate 120, the frame 110, the back cover 200, etc.

[0136] Exemplarily, the electrical length of the second radiator 400 is 0.25λ2.

[0137] In this way, the distance between the second peak position and the first peak position is larger, the electromagnetic radiation energy radiated by the antenna 50 when working at the preset frequency is more dispersed, and the superposition effect of the electromagnetic waves radiated from the first radiator 300 and the electromagnetic waves radiated from the second radiator 400 is weaker, which can make the specific absorption rate of the antenna 50 lower.

[0138] Exemplarily, the electrical length of the second radiator 400 may also be less than 0.25λ2.

[0139] In this way, the length of the second radiator 400 can be shortened, and the length of the antenna 50 can be shortened, which is conducive to arranging the antenna 50 on an electronic device with a smaller size.

[0140] To facilitate tuning, in some examples where the fourth end 420 is a short-circuit end and the electrical length of the second radiator 400 is greater than or equal to 0.15λ2 and 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. In other words, the second radiator 400 is electrically connected to the RF chip 60. When the antenna 50 is in operation, the RF chip 60 feeds current into the second radiator 400. After the current is fed into the second radiator 400, the current can be coupled to the first radiator 300 through the first slot 810, generating a parasitic current on the first radiator 300.

[0141] In some examples where the second radiator 400 has the feeding point 51 , a distance from the feeding point 51 to the fourth end 420 is smaller than a distance from the feeding point 51 to the third end 410 .

[0142] Figure 9 A schematic diagram of another antenna provided in an embodiment of the present application.

[0143] like Figure 9 As shown, in some other examples where 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 .

[0144] Figure 10 A schematic diagram of another antenna provided in an embodiment of the present application.

[0145] like Figure 10In another example shown in FIG. 4, 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.

[0146] Figure 11 A schematic diagram of another antenna provided by an embodiment of the present application.

[0147] As shown in FIG. 5, in some possible implementations, 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. Figure 11 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 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.

[0148] 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 the improvement of the radiation performance of the antenna 50.

[0149]

[0150] A schematic diagram of a first radiator provided by an embodiment of the present application, Figure 12a A schematic diagram of another first radiator provided by an embodiment of the present application. Figure 12b As shown in FIG. 6, in some possible implementations, the first radiator 300 has a length of L1, the length of the first radiator 300 far from the second radiator 400 is L2, and the length of the first radiator 300 close to the second radiator 400 is L3.

[0151] Figure 12a , Figure 12b When the length of the first radiator 300 far from the second radiator 400 is reduced by a phase difference , the first peak position of the first radiator 300 will move ​To reduce the shift of the first peak position toward 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 by reducing the length of the first radiator 300. The capacitor electrically connected to the first radiator 300 can maintain the equivalent length of the first radiator 300 or increase the equivalent length of the first radiator 300.

[0152] Figure 13 A schematic diagram of another antenna provided in an embodiment of the present application.

[0153] like Figure 13 As shown, in some possible implementations, 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. In this case, the electrical length of the first radiator 300 is less than 0.5λ1.

[0154] This allows the first radiator 300 to be shortened while maintaining a larger distance between the first peak position and the second peak position. This helps maintain a low specific absorption rate for the antenna 50 while shortening the length of the first radiator 300, facilitating installation of the antenna 50 on a smaller electronic device. Furthermore, when the antenna 50 operates at a predetermined frequency, the currents at the first peak position and the second peak position of the first radiator 300, whose electrical length is less than 0.5λ1, are relatively balanced, allowing the antenna 50 to have a low specific absorption rate and a shorter length.

[0155] 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 parameters such as the length of the first radiator 300, the preset frequency, and the distance between the first radiator 300 and the ground.

[0156] For example, the equivalent length of the first radiator 300 may be equal to 0.5λ1, so that the currents on the first radiator 300 and the second radiator 400 are relatively balanced.

[0157] Exemplarily, the first capacitor 510 may be a lumped capacitor or a distributed capacitor.

[0158] Figure 14a This is a schematic diagram of an electric field simulation of an antenna provided in an embodiment of the present application. Figure 14b This is a schematic diagram of an electric field simulation of another antenna provided in an embodiment of the present application. Figure 14c This is a schematic diagram of an electric field simulation of another antenna provided in an embodiment of the present application. Figure 14a The length of the first radiator 300 of the antenna 50 is greater than Figure 14bthe length of the first radiator 300 of the antenna 50 in Figure 14b the length of the first radiator 300 of the antenna 50 in Figure 14c the length of the first radiator 300 of the antenna 50 in Figure 14a and Figure 14b neither end of the first radiator 300 in Figure 14c the first end of the first radiator 300 in

[0159] as shown in Figure 14a , Figure 14b and Figure 14c , Figure 14b the distance from the first peak position S2 to the second radiator 400 in Figure 14a the distance from the first peak position S1 to the second radiator 400 in Figure 14c the distance from the first peak position S3 to the second radiator 400 in Figure 14a the distance from the first peak position S1 to the second radiator 400 in Figure 14c the first peak position S3 in Figure 14a the first peak position S1 in

[0160] Figure 15 is a schematic diagram of an inverted-F antenna (IFA), Figure 16 is a schematic diagram of a slot antenna, Figure 17 is a schematic diagram of another antenna provided by an embodiment of the present application, Figure 18 is a schematic diagram of another antenna provided by an embodiment of the present application, Figure 19a is Figure 15 is a simulation diagram of the specific absorption rate of the antenna in Figure 19b is a simulation diagram of the specific absorption rate of the antenna in Figure 16 is a simulation diagram of the specific absorption rate of the antenna in Figure 19c is a simulation diagram of the specific absorption rate of the antenna in Figure 17 is a simulation diagram of the specific absorption rate of the antenna in Figure 19d is a simulation diagram of the specific absorption rate of the antenna in Figure 18 . Wherein, Figure 19a , Figure 19b , Figure 19c and Figure 19d are simulation diagrams when the preset frequency is 2.16 GHz. Figure 15 the length of the radiator in Figure 16 the length of the left radiator in Figure 17The length of the first radiator 300 is 32 mm, and the length of the second radiator 400 is 20 mm. Figure 18 The length of the first radiator 300 is 25 mm, the length of the second radiator 400 is 20 mm, and the size of the first capacitor 510 is 1.2 pf.

[0161] exist Figure 19a and Figure 19b In the figure, the specific absorption rate of antenna 50 has only one peak, and the hot spots are relatively concentrated. Figure 19c and Figure 19d In the figure, the specific absorption rate of antenna 50 has two peaks, and the specific absorption rate of antenna 50 is relatively dispersed.

[0162] Figure 20 for Figures 15 to 18 A schematic diagram comparing the radiation efficiency of the four antennas in FIG. In the figure, the bar graph ① is Figure 15 The radiation efficiency of antenna 50 in FIG. 1 is Figure 16 The radiation efficiency of antenna 50 in FIG. 1 is Figure 17 The radiation efficiency of antenna 50 in the histogram is Figure 18 The radiation efficiency of the antenna 50 in FIG.

[0163] like Figure 20 As shown, Figure 17 and Figure 18 The radiation efficiency of the antenna 50 is higher than Figure 15 and Figure 16 The radiation efficiency of the antenna 50 in FIG.

[0164] Figure 21 for Figures 15 to 18 The comparison diagram of the normalized specific absorption rate of the four antennas in the figure is shown in Figure 1. Figure 15 The normalized specific absorption rate of antenna 50 in the histogram ① is Figure 16 The normalized specific absorption rate of antenna 50 in the histogram ① is Figure 17 The normalized specific absorption rate of antenna 50 in the histogram ① is Figure 18 The normalized specific absorption rate of antenna 50 in .

[0165] like Figure 21 As shown, Figure 17 and Figure 18 The normalized specific absorption rate of antenna 50 is lower than Figure 15 and Figure 16 The normalized specific absorption rate of antenna 50 in .

[0166] In some examples where the antenna 50 further includes a first capacitor 510 , the first capacitor 510 is an adjustable capacitor.

[0167] In this way, the size of the first capacitor 510 can be adjusted according to the operating frequency of the antenna 50, so that when the antenna 50 operates at a variety of different frequencies, radiation with a lower specific absorption rate and a higher radiation efficiency can be achieved.

[0168] Exemplarily, the adjustable capacitor may 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 may be electrically connected to the first end 310 via a switch.

[0169] Exemplarily, the adjustable capacitor may include multiple 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 may be electrically connected to the first end 310 through the same single-pole multi-throw switch.

[0170] In some other examples, the electrical length of the first radiator 300 is equal to 0.5λ1.

[0171] In this way, when the end of the first radiator 300 away from the second radiator 400 is not electrically connected to the first capacitor 510, the distance between the first peak position and the second peak position can be larger. This allows the electromagnetic radiation energy radiated by the antenna 50 to be more dispersed when operating at the preset frequency, and the superposition effect of the electromagnetic waves radiated from the first radiator 300 and the electromagnetic waves radiated from the second radiator 400 is weaker, resulting in a lower specific absorption rate (SAR) of the antenna 50. Furthermore, when the antenna 50 operates at the preset frequency, the current at the first peak position and the second peak position are more balanced, and the difference in magnetic field strength at the first peak position and the second peak position is smaller, which helps reduce the SAR of the antenna 50.

[0172] Figure 22 A schematic diagram of another antenna provided in an embodiment of the present application.

[0173] like Figure 22 As shown, similar to the first radiator 300, in some examples where the fourth end 420 is an open end and the electrical length of the second radiator 400 is greater than 0.25λ2 and 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 grounded. The length of the second radiator 400 is less than 0.5λ2.

[0174] In this way, when the fourth end 420 is an open end, the length of the second radiator 400 can be shortened while maintaining a larger distance between the first peak position and the second peak position, which is beneficial for shortening the length of the second radiator 400 while maintaining a lower specific absorption rate for the antenna 50, and is beneficial for setting the antenna 50 on a smaller electronic device.

[0175] The second capacitance 520 is greater than or equal to 0.5 pf and less than or equal to 10 pf, and a specific value of the second capacitance 520 can be determined according to a length of the second radiator 400, a preset frequency, and a distance between the second radiator 400 and the ground.

[0176] For example, an equivalent length of the second radiator 400 with the fourth end 420 being an open end can be equal to 0.5λ2. In this way, a distance between the first peak position and the second peak position can be greater.

[0177] For example, the second capacitance 520 can be a lumped capacitance or a distributed capacitance.

[0178] In some possible implementation manners, the second capacitance 520 is an adjustable capacitance.

[0179] In this way, the size of the second capacitance 520 can be adjusted according to a working frequency of the antenna 50, so that a lower specific absorption rate and a higher radiation efficiency can be achieved when the antenna 50 works at different frequencies.

[0180] For example, the adjustable capacitance can include a plurality of second sub-capacitances connected in parallel, one end of each second sub-capacitance is electrically connected to the ground, and the other end of each second sub-capacitance can be electrically connected to the fourth end 420 through a switch.

[0181] For example, the adjustable capacitance can include a plurality of second sub-capacitances connected in parallel, one end of each second sub-capacitance is electrically connected to the ground, and the other end of each second sub-capacitance can be electrically connected to the fourth end 420 through a single-pole multi-throw switch.

[0182] In another example, an electrical length of the second radiator 400 is equal to 0.5λ2.

[0183] In this way, when the fourth end 420 is an open end and the second end of the second radiator 400 is not electrically connected to the second capacitance 520, a distance between the first peak position and the second peak position can be greater, electromagnetic radiation energy radiated when the antenna 50 works at a preset frequency can be more dispersed, and a superposition effect of electromagnetic waves radiated on the first radiator 300 and electromagnetic waves radiated on the second radiator 400 is weaker, so that a specific absorption rate of the antenna 50 is lower.

[0184] 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, a 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 gap 810 can be formed by cutting the frame 110.

[0185] In this way, the fixed position frame antenna can achieve high radiation efficiency and low specific absorption rate. In addition, the electronic device provided with the frame antenna has high integration and small size.

[0186] In some other possible embodiments, the back cover 200 can include the first radiator 300 and the second radiator 400 of the antenna 50. Specifically, the edges of the back cover 200 can be formed of metal, and two metal strips can be formed by slitting the edges of the back cover 200, where one metal strip is the first radiator 300 and the other metal strip is the second radiator 400.

[0187] When the electronic device is a non-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 on the short side of the frame 110.

[0188] Figure 23 Another schematic diagram of an electronic device provided by an embodiment of the present application in a folded state.

[0189] As shown in Figure 23 In some examples of the electronic device being a foldable device including a first housing 10a and a second housing 10b, the first housing 10a includes a first frame 110a, and the first frame 110a includes the first radiator 300 of the antenna 50 and the second radiator 400 of the antenna 50. The second housing 10b includes a second frame 110b, and the second frame 110b includes 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. The fifth end 610, the sixth end 620, and the seventh end 710 are all open-circuit ends. The sixth end 620 is arranged opposite the seventh end 710, and the sixth end 620 and the seventh end 710 have a second gap 820 therebetween. The third radiator 600 and the fourth radiator 700 can be coupled through the second gap 820.

[0190] 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 the 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 to 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 to the second radiator 400. The first slit 810 and the second slit 820 are aligned, and the width of the first slit 810 is equal to the width of the second slit 820.

[0191] When the antenna 50 operates at a preset frequency, the current on the third radiator 600 and the current on the fourth radiator 700 have the same direction.

[0192] Thus, for an electronic device in a folded state, when the antenna 50 operates at a preset frequency, the power fed into the antenna 50 through the feed point 51 can be distributed to the first radiator 300, the second radiator 400, the third radiator 600, and the fourth radiator 700 for outward radiation, thereby further improving the dispersion of the radiated electromagnetic waves, further reducing the peak value of the magnetic field intensity of the radiated electromagnetic waves, and thereby further reducing the specific absorption rate of the electronic device. In addition, for an electronic device in a folded state, when the antenna 50 operates at a preset frequency, the power can be radiated outward through the first radiator 300, the second radiator 400, the third radiator 600, and the fourth radiator 700, further reducing the loss of outward radiation of the active power fed into the antenna 50 and further improving the radiation efficiency of the antenna 50.

[0193] Figure 24 A schematic diagram of another electronic device in a folded state provided in an embodiment of the present application.

[0194] like Figure 24 As shown, in the example where the fourth end 420 is a short-circuit end, the eighth end 720 is a short-circuit end.

[0195] Figure 25 A schematic diagram of another electronic device in a folded state provided in an embodiment of the present application.

[0196] like Figure 25As shown, in the example where the first terminal 310 is electrically connected to the first capacitor 510, the fifth terminal 610 is electrically connected to the third capacitor 530. One end of the third capacitor 530 is electrically connected to the fifth terminal 610, and the other end of the third capacitor 530 is grounded. The third capacitor 530 is the same capacitor as the first capacitor 510.

[0197] Figure 26 This is a schematic diagram comparing the radiation efficiency of the antennas of an electronic device provided in an embodiment of the present application when in a folded state and two other electronic devices when in a folded state. In the figure, histogram ① shows the radiation efficiency of the two inverted F antennas of an electronic device including two side-by-side inverted F antennas, one of which is fed and the other is parasitic. Figure 25 The radiation efficiency at the antenna 50 of the electronic device is shown in FIG. 1 . The bar graph ① shows the radiation efficiency at the two slot antennas of the electronic device including two side-by-side slot antennas, one of which is fed and the other is parasitic.

[0198] like Figure 26 As shown, Figure 25 The radiation efficiency at the antenna 50 of the electronic device is higher than the radiation efficiency at the antennas 50 of the other two electronic devices.

[0199] Figure 27 This is a schematic diagram comparing the normalized specific absorption rate of the antennas of an electronic device in a folded state and two other electronic devices in a folded state provided by an embodiment of the present application. In the figure, histogram ① is the normalized specific absorption rate of the two inverted F antennas of an electronic device including two side-by-side inverted F antennas, one of which is fed and the other is parasitic. Figure 25 The normalized specific absorption rate at the antenna 50 of the electronic device in FIG. 1 is the normalized specific absorption rate at the two slot antennas of the electronic device including two side-by-side slot antennas, one of which is fed and the other is parasitic.

[0200] like Figure 27 As shown, Figure 25 The normalized specific absorption rate at the antenna 50 of the electronic device is lower than the normalized specific absorption rates at the antennas 50 of the other two electronic devices.

[0201] Figure 28 A schematic diagram of another electronic device in a folded state provided in an embodiment of the present application.

[0202] like Figure 28 As shown, in the example where the fourth end 420 is an open end, the eighth end 720 is an open end.

[0203] Figure 29 A schematic diagram of another electronic device in a folded state provided in an embodiment of the present application.

[0204] As Figure 29 shown, in the example in which the fourth end 420 is electrically connected with the second capacitor 520, the eighth end 720 is electrically connected with the fourth capacitor 540, one end of the fourth capacitor 540 is electrically connected with the eighth end 720, and 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.

[0205] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the 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.

[0206] In the embodiments of the present application or the devices or elements implied by the present application must have 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 "a plurality of" is two or more, unless otherwise specified.

[0207] The terms "first", "second", "third", "fourth" and the like (if any) in the description of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0208] The term "a plurality of" herein refers to two or more. The term "and / or" herein is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship; in the formula, the character " / " represents that the front and rear associated objects are a "division" relationship.

[0209] It can be understood that various numerical numbers involved in the embodiments of the present application are only distinguished for convenience of description, and are not used to limit the scope of the embodiments of the present application.

[0210] It can be understood that the size of the serial numbers of the above processes in the embodiments of the present application does not mean the order of execution, and the execution order of the processes should be determined according to their functions 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 and the third end are arranged opposite to each other, 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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