Antenna assembly and electronic equipment

Abstract

The invention provides an antenna assembly and electronic equipment, the outer edge of a radiator is symmetrical about a first center line, the radiator comprises a feed part and a tuning part which are arranged at an interval, the feed part is located on the first center line of the radiator, the feed part and the midpoint of the first center line are arranged at an interval, and the tuning part and the first center line are arranged at an interval; one end of the capacitor structure is electrically connected with the tuning part, and the other end of the capacitor structure is grounded; the signal source is used for exciting the radiator to form a target resonance mode supporting a target frequency band, the target resonance mode enables the radiator to form a first resonance current at a first phase along the outer edge, and the target resonance mode enables the radiator to form a second resonance current at a second phase along the outer edge; the angle between the direction of the first resonance current and the direction of the second resonance current is a preset angle, so that circularly polarized waves are formed. According to the invention, the circular polarization of the antenna assembly and the electronic equipment can be improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an antenna assembly and an electronic device. Background Art

[0002] Satellite communications generally use circularly polarized antennas. Currently, satellite communication antennas used in mobile phones, wearable devices and other electronic devices are all linearly polarized antennas. If mobile phones, wearable devices and other electronic devices use linearly polarized antennas, it will lead to at least 3dB of polarization mismatch, that is, at least 3dB of performance degradation, resulting in reduced circular polarization efficiency of mobile phones, wearable devices and other electronic devices. Therefore, how to improve the circular polarization performance of antenna components in electronic devices has become a technical problem that needs to be solved. Summary of the invention

[0003] The present application provides an antenna assembly for improving circular polarization and an electronic device having the antenna assembly.

[0004] In a first aspect, an antenna assembly provided by an embodiment of the present application includes:

[0005] A radiator, wherein the outer edge of the radiator is symmetrical about a first center line, the radiator comprises a feeding portion and a tuning portion arranged at intervals, the feeding portion is located on the first center line of the radiator, the feeding portion is arranged at intervals from a midpoint of the first center line, and the tuning portion is arranged at intervals from the first center line;

[0006] a capacitor structure, one end of which is electrically connected to the tuning unit and the other end of which is grounded; and

[0007] A signal source, the signal source is electrically connected to the feeding part, and is used to excite the radiator to form a target resonance mode supporting a target frequency band, the target resonance mode causes the radiator to form a first resonance current in a first phase along an outer edge, and the target resonance mode causes the radiator to form a second resonance current in a second phase along an outer edge, and the angle between the direction of the first resonance current and the direction of the second resonance current is a preset angle to form a circularly polarized wave.

[0008] In a second aspect, an electronic device provided in an embodiment of the present application comprises a back cover, a conductor and the antenna assembly, wherein the radiator is arranged on the back cover, a portion of the radiator that is spaced apart from the conductor by a distance less than a preset distance is the tuning portion, the conductor is grounded, and the capacitor structure is formed between the tuning portion and the conductor.

[0009] The antenna assembly and electronic device provided by the present application are designed to be symmetrical about the first center line by designing the outer edge of the radiator, the radiator includes a feeding part and a tuning part arranged at intervals, the feeding part is located on the first center line of the radiator, the feeding part and the midpoint of the first center line are arranged at intervals, and the tuning part and the first center line are arranged at intervals; and one end of the capacitor structure is designed to be electrically connected to the tuning part, and the other end of the capacitor structure is grounded; the signal source is electrically connected to the feeding part, which is used to excite the radiator to form a target resonance mode that supports the target frequency band, the target resonance mode causes the radiator to form a first resonance current in the first phase along the outer edge, and the target resonance mode causes the radiator to form a second resonance current in the second phase along the outer edge, and the angle between the first resonance current and the second resonance current is a preset angle to form a circularly polarized wave; the antenna assembly provided by the present application is a circularly polarized antenna, which has relatively good circular polarization performance. When applied to electronic equipment, it enables the electronic equipment to have better performance when communicating with a satellite. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0011] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0012] Figure 2 It is a schematic diagram of a partial decomposition structure of an electronic device provided in an embodiment of the present application;

[0013] Figure 3 It is a simplified structural schematic diagram of an antenna assembly provided in an embodiment of the present application;

[0014] Figure 4 is a schematic diagram of an equivalent circuit structure of an antenna assembly provided in an embodiment of the present application;

[0015] Figure 5 yes Figure 4 A simplified diagram of current distribution of a first resonant current of the provided antenna assembly;

[0016] Figure 6 yes Figure 4 A simplified diagram of current distribution of a second resonant current of the provided antenna assembly;

[0017] Figure 7 yes Figure 4 A detailed structural diagram of the radiator of the provided antenna assembly;

[0018] Figure 8 is a current distribution diagram of an antenna assembly provided in an embodiment of the present application without a capacitor structure at a phase of 0°;

[0019] Fig. 9is a current distribution diagram of an antenna assembly provided in an embodiment of the present application without a capacitor structure at a phase of 90°;

[0020] Fig.10 is a current distribution diagram of the antenna assembly at a 0° phase provided by the first embodiment of the present application;

[0021] Fig.11 This is a current distribution diagram of the antenna assembly provided by the first embodiment of the present application at a 90° phase;

[0022] Fig.12 is the axial ratio (side view) of the antenna in the embodiment of the present application without the capacitor structure;

[0023] Fig.13 is the axial ratio of the antenna assembly provided with a capacitor structure in the embodiment of the present application (side view);

[0024] Fig.14 1 is a gain diagram and a left / right circular polarization gain diagram of an antenna without a capacitor structure in an embodiment of the present application;

[0025] Fig.15 The gain, left-hand circular polarization gain and right-hand circular polarization gain diagram of the antenna with a capacitor structure according to the embodiment of the present application;

[0026] Fig.16 is a current distribution diagram of the antenna assembly at a 0° phase provided by the second embodiment of the present application;

[0027] Fig.17 is a current distribution diagram of the antenna assembly at a 90° phase provided by the second embodiment of the present application;

[0028] Fig.18 is a current distribution diagram of the antenna assembly at a 0° phase provided by the third embodiment of the present application;

[0029] Fig.19 is a current distribution diagram of the antenna assembly at a 90° phase provided by the third embodiment of the present application;

[0030] Fig. 20 is a current distribution diagram of the antenna assembly at a 0° phase provided by the fourth embodiment of the present application;

[0031] Fig.21 is a current distribution diagram of the antenna assembly at a 90° phase provided by the fourth embodiment of the present application;

[0032] Fig. 22 is a partial structural diagram of another electronic device provided in an embodiment of the present application;

[0033] Fig.23 is a schematic structural diagram of a camera decoration of an electronic device in which the radiator of the antenna assembly in an embodiment of the present application is a camera decoration of an electronic device;

[0034] Fig.24 yes Fig.23 A partial side view of an electronic device is provided;

[0035] Fig.25 It is a partial structural schematic diagram of a back cover of an electronic device provided in an embodiment of the present application;

[0036] Fig.26 is another partial structural schematic diagram of a back cover of an electronic device provided in an embodiment of the present application;

[0037] Fig. 27 yes Fig.23 Another partial side view of an electronic device is provided;

[0038] Fig.28 This is a structural diagram of a camera decorative part with a window provided in an embodiment of the present application;

[0039] Fig.29 yes Fig.23 The direction diagram of the electronic device when answering a satellite call is shown.

[0040] Description of Figure Numbers:

[0041] Electronic device 1000; antenna assembly 100; display screen 200; middle frame 300; back cover 400; middle plate 310; frame 320; radiator 10; capacitor structure 20; signal source 30; first center line L1; second center line L2; feeding part A; tuning part B; first target point G1; second target point G2; third target point G3; fourth target point G4; first side 11; second side 12; first sub-current Q1; second sub-current Q2; third sub-current Q3; fourth sub-current Q4; first quadrant area N1; second quadrant area N2; third quadrant area N3; fourth quadrant area N4; conductor 600; camera module 700; camera decoration 410; camera 710; camera conductive housing 720; window 13. DETAILED DESCRIPTION

[0042] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0043] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0044] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0045] See also Figure 1 , Figure 1 The following is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. The electronic device 1000 includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, a robot, a digital camera, and other devices with communication functions. The present embodiment of the present application is described using a mobile phone as an example, and other electronic devices may refer to this embodiment.

[0046] See also Figure 2 The electronic device 1000 includes an antenna assembly 100. The antenna assembly generates circularly polarized waves to improve the circular polarization performance of the electronic device.

[0047] See also Figure 2, the working environment of the antenna assembly 100 is illustrated by taking the electronic device 1000 as a mobile phone as an example. The electronic device 1000 includes a display screen 200, a middle frame 300 and a back cover 400 arranged in sequence along the thickness direction. Among them, the middle frame 300 includes a middle plate 310 and a frame 320 surrounding the periphery of the middle plate 310. The display screen 200, the middle plate 310 and the back cover 400 are arranged in sequence, and a receiving space is formed between the display screen 200 and the middle plate 310, and between the middle plate 310 and the back cover 400 to accommodate components such as a main board, a camera module, a receiver module, a battery, and various sensors. One side of the frame 320 is surrounded by the edge of the display screen 200, and the other side of the frame 320 is surrounded by the edge of the back cover 400 to form a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integrated structure, and the frame 320 and the back cover 400 can be a split structure. In other embodiments, the frame 320 and the back cover 400 may be an integral structure, or the frame 320 and the back cover 400 may be a separate structure. The above is the working environment of the antenna assembly 100 taking a mobile phone as an example, but the antenna assembly 100 of the present application is not limited to the above working environment.

[0048] See also Figure 3 and Figure 4 The antenna assembly 100 includes a radiator 10 , a capacitor structure 20 and a signal source 30 .

[0049] See also Figure 4 , the outer edge of the radiator 10 is symmetrical about the first center line L1.

[0050] Furthermore, the outer contour of the radiator 10 may be an axisymmetric shape, a centrally symmetrical shape, etc. The axis of symmetry of the radiator 10 includes but is not limited to the first center line L1. For ease of description, the direction of the first center line L1 is defined as the Y-axis direction, that is, Figure 4 The present application does not specifically limit the shape of the radiator 10. Optionally, the radiator 10 is circular, rectangular, square, triangular, hexagonal, or a combination of half rectangle and half semicircle.

[0051] Optionally, the radiator 10 is in the form of a sheet, a layer, a film, etc.

[0052] Optionally, the material of the radiator 10 is a conductive material, specifically including but not limited to metal, etc. The form of the radiator 10 includes but is not limited to a flexible printed circuit board antenna formed on a flexible printed circuit board (Flexible Printed Circuit board, FPC), a laser direct structured antenna by laser direct structure (Laser Direct Structuring, LDS), a printed direct structured antenna by printing direct structure (Print Direct Structuring, PDS), a conductive sheet antenna (such as a metal bracket antenna), etc. In this embodiment, the radiator 10 is an example of a conductive sheet antenna for description.

[0053] See also Figure 4 , the radiator 10 includes a feeding part A and a tuning part B arranged at intervals. The feeding part A and the tuning part B are both local areas on the radiator 10, and the feeding part A is used to be electrically connected to the signal source 30 to feed the excitation signal. The tuning part B is the area where the capacitor structure 20 is set, and the capacitor structure 20 is used to change the current distribution on the radiator 10. This application does not make specific restrictions on the local area where the feeding part A is located and the local area where the tuning part B is located.

[0054] The feeding portion A is located on the first center line L1 of the radiator 10. Optionally, the center of the feeding portion A is located on or near the first center line L1. The feeding portion A is spaced apart from the midpoint of the first center line L1 so that the radiator 10 without the capacitor structure 20 can form a current distribution symmetrical about the first center line L1 under the excitation of the signal source 30. When the feeding portion A is located at the midpoint of the first center line L1, the current distribution formed by the radiator 10 without the capacitor structure 20 under the excitation of the signal source 30 is a current distribution that diverges from the midpoint of the first center line L1 to the circumference. If the capacitor structure 20 is provided, the effect of generating a circularly polarized wave cannot be achieved for the current distribution.

[0055] Optionally, the feeder A is disposed at the edge of the radiator 10. On the one hand, the clearance at the edge of the radiator 10 is relatively good, so that the antenna assembly 100 can radiate antenna signals externally. Therefore, by arranging the feeder A at the edge of the radiator 10, the radiation efficiency of the antenna assembly 100 can be increased. In addition, when the feeder A is located at the edge of the radiator 10, the distance between the feeder A and the farthest edge on the radiator 10 is longer, that is, the current path is longer, and the size of the radiator 10 can be fully utilized to reduce size waste, so that a relatively low frequency band can be supported on the radiator 10 with a limited length.

[0056] See also Figure 4, the tuning part B is spaced apart from the first center line L1. Since the tuning part B is where the capacitor structure 20 is set, and when the capacitor structure 20 is set on the first center line L1, the capacitor structure 20 has the same effect on the current on both sides of the first center line L1, making the current on both sides of the first center line L1 differentiated, and thus the effect of generating a circularly polarized wave cannot be achieved. However, by spacing the tuning part B from the first center line L1, the distance between the capacitor structure 20 and both sides of the first center line L1 is different, and the capacitor structure 20 has different tuning effects on the current distribution on both sides of the first center line L1, thereby achieving asymmetric and differentiated currents on both sides of the first center line L1, which is conducive to the formation of a circularly polarized wave.

[0057] See also Figure 4 , one end of the capacitor structure 20 is electrically connected to the tuning part B, and the other end of the capacitor structure 20 is grounded. In one embodiment, the capacitor structure 20 can be a capacitor device. Further, the capacitor device can be arranged on a circuit board, and one end of the capacitor device is electrically connected to the reference ground of the circuit board. The electrical connection method includes but is not limited to electrical connection through a metal wire or the like. The other end of the capacitor device is electrically connected to the tuning part B on the radiator 10. The electrical connection method includes but is not limited to electrical connection through a conductive spring or the like. In another embodiment, the capacitor structure 20 can be two opposite electrode plates with a small spacing, wherein the radiator 10 can be reused as one of the electrode plates, and the other electrode plate can be a metal plate. Further, in one embodiment, the metal plate can reuse a metal device in an electronic device.

[0058] See also Figure 4 , the signal source 30 is electrically connected to the feeder A. In the present application, electrical connection includes direct electrical connection, i.e., physical contact electrical connection, or coupled electrical connection, i.e., electrical connection without direct contact. The signal source 30 coupled electrically connected to the feeder A is also called capacitive feeding or coupled feeding.

[0059] Optional, see Figure 4 , the antenna assembly 100 also includes a matching circuit M. The matching circuit M is arranged on a circuit board. One end of the matching circuit M is electrically connected to the signal source 30, and the other end of the matching circuit M is electrically connected to the feeding part A. Among them, the matching circuit M is used to adjust the impedance of the radiation path on the radiator 10 so that the impedance of the radiation path on the radiator 10 has a better match with the required radiation frequency band (for example, the first frequency band and the second frequency band) to generate a resonant mode of the required frequency band and have better radiation performance in the required frequency band. The present application does not limit the specific structure of the matching circuit M. Optionally, the matching circuit M includes a circuit structure composed of multiple components such as capacitors, inductors and resistors.

[0060] The signal source 30 is used to excite the radiator 10 to form a target resonant mode that supports the target frequency band. The present application does not specifically limit the size of the target frequency band. Optionally, the target frequency band includes but is not limited to the LB frequency band (less than 1 GHz), the MHB frequency band (1 GHz-3 GHz), the UHB frequency band (greater than 3 GHz), etc. Of course, the target frequency band may also include the GPS frequency band, etc.

[0061] See also Figure 5 and Figure 6 , the target resonance mode causes the radiator 10 to form a first resonance current I1 in a first phase along the outer edge (wherein the position where the I1 label is located does not indicate that there is an I1 current at that position), and the target resonance mode causes the radiator 10 to form a second resonance current I2 in a second phase along the outer edge. The angle between the direction of the first resonance current I1 and the direction of the second resonance current I2 is a first preset angle to form a circularly polarized wave. The present application does not make a specific limitation on the first preset angle, and the first preset angle can enable the first resonance current I1 and the second resonance current I2 to form a circularly polarized wave that meets the requirements. The first preset angle is close to vertical or vertical. For example, the first preset angle is between 70° and 110°, and this data is for example. For example, the first preset angle may be 90°. For further example, the direction of the first resonance current I1 is in the reverse direction along the Y axis, and the direction of the second resonance current I2 is in the positive direction along the X axis.

[0062] Among them, the first phase differs from the second phase by a second preset angle. The present application does not make a specific limitation on the second preset angle, and the second preset angle can enable the first resonant current I1 and the second resonant current I2 to form a circularly polarized wave that meets the requirements. For example, the second preset angle is between 70° and 110°, and this data is for example. For example, the second preset angle may be 90°. For further example, the first phase is 0° and the second phase is 90°; or, the first phase is 10° and the second phase is 90°; or, the first phase is 80° and the second phase is 180°, and so on.

[0063] In the present application, the first resonant current I1 and the second resonant current I2 are currents in different phases of the target resonant mode, and the amplitudes of the first resonant current I1 and the second resonant current I2 are similar or the same.

[0064] The present application designs the shape of the radiator 10 and the position of the feeding part A to present a symmetrical structure; designs the position where the capacitor structure 20 is loaded on the radiator 10, so that the symmetrical current on the radiator 10 is adjusted to an asymmetrical current distribution, and tunes out a current pair with similar amplitudes, a phase difference of (or approximately) 90°, and orthogonal (or approximately orthogonal) directions, thereby forming a circularly polarized wave.

[0065] The antenna assembly 100 and the electronic device 1000 provided in the present application are designed to be symmetrical about the first center line L1 by designing the outer edge of the radiator 10, the radiator 10 includes a feed part A and a tuning part B arranged at intervals, the feed part A is located on the first center line L1 of the radiator 10, the feed part A is arranged at an interval with the midpoint of the first center line L1 (for example, greater than or equal to 0.01λ, λ is the wavelength of the target frequency band), and the tuning part B is arranged at an interval with the first center line L1; and one end of the capacitor structure 20 is designed to be electrically connected to the tuning part B, and the other end of the capacitor structure 20 is grounded; the signal source 30 is electrically connected to the feed part A, and is used to excite the radiator 10. A target resonance mode supporting a target frequency band is formed, wherein the target resonance mode forms a first resonance current I1 at a first phase on the outer edge of the radiator 10, and the target resonance mode forms a second resonance current I2 at a second phase on the outer edge of the radiator 10, wherein the angle between the first resonance current I1 and the second resonance current I2 is a first preset angle to form a circularly polarized wave; wherein the first phase differs from the second phase by a second preset angle, and the antenna assembly 100 provided in the present application is a circularly polarized antenna having relatively good circular polarization performance, and when applied to an electronic device 1000, enables the electronic device 1000 to have better performance when communicating with a satellite.

[0066] See also Figure 7 , the present application does not make any specific limitation on the size of the radiator 10. Optionally, the intersection of the first center line L1 and the outer edge of the radiator 10 are the first target point G1 and the second target point G2, respectively. Taking the first center line L1 as a vertical line as an example, the first target point G1 is the midpoint of the top or the highest point of the top, and the second target point G2 is the midpoint of the bottom or the highest point of the bottom. The equivalent electrical length from the first target point G1 to the second target point G2 corresponds to 1 / 2 wavelength of the target frequency band. In other words, the equivalent electrical length from the first target point G1 to the second target point G2 is close to 1 / 2 wavelength of the target frequency band, so that the feeding part A is arranged at the first target point G1 or near the first target point G1, and in the case where the capacitor structure 20 is not provided, the current mode formed by the signal source 30 exciting the radiator 10 is a 1 / 2 wavelength mode. The current distribution is flowing from the feeder A (first target point G1) to the second target point G2 or from the second target point G2 to the feeder A (first target point G1), and the current intensity is weak at both ends and strong in the middle. In this way, a current distribution mode symmetrical on both sides is formed without setting the capacitor structure 20. The symmetrical current distribution mode can be the initial mode before the capacitor structure 20 is set. The symmetrical current distribution mode is used as the initial mode, which is easier to tune to an asymmetric current distribution, and tunes out a current pair with similar amplitude, a phase difference of (or about) 90°, and an orthogonal (or approximately orthogonal) direction, thereby forming a circularly polarized wave.

[0067] For further information, see Figure 7The first center line L1 divides the outer edge of the radiator 10 into a first side 11 and a second side 12. The first side 11 is the left side in the figure, and the second side 12 is the right side in the figure. The left side and the right side are symmetrical about the first center line L1.

[0068] See also Figure 7 , the radiator 10 also has a second center line L2. The second center line L2 is perpendicular to the first center line L1. The second center line L2 intersects with the first center line L1 at the midpoint of the first center line L1. Further, the second center line L2 extends along the X-axis direction. The intersection point of the second center line L2 on the first side 11 is the third target point G3, and the intersection point of the second center line L2 on the second side 12 is the fourth target point G4.

[0069] Taking the radiator 10 as a circle as an example, the first target point G1 is the top point, the second target point G2 is the bottom point, the third target point G3 is the left point, and the fourth target point G4 is the right point.

[0070] In the following, in conjunction with the accompanying drawings, for an antenna assembly 100 without a capacitor structure 20, the radiator 10 is circular, the equivalent electrical length from the first target point G1 to the second target point G2 corresponds to 1 / 2 wavelength of the target frequency band, and the feeding part A is arranged at the first target point G1 as an example to illustrate the initial current mode before tuning the capacitor structure 20, and the initial current mode is compared with the resonant current mode of the antenna assembly 100 with the capacitor structure 20 to facilitate explanation of the role of the capacitor structure 20.

[0071] See also Figure 8 and Fig. 9 , Figure 8 This is a current distribution diagram of the radiator 10 provided in an embodiment of the present application without the capacitor structure 20 at a phase of 0°. Fig. 9 This is a current distribution diagram of the radiator 10 provided in an embodiment of the present application without the capacitor structure 20 at a phase of 90°.

[0072] The radiator 10 forms a 1 / 2 wavelength mode of the target frequency band under the excitation of the signal source 30. That is, the effective electrical length of the radiator 10 from the first target point G1 to the second target point G2 is approximately 1 / 2 wavelength of the target frequency band, and further, the effective electrical length from the first target point G1 along the first side 11 to the second target point G2 is approximately 1 / 2 wavelength of the target frequency band, so as to form a 1 / 2 wavelength mode supporting the target frequency band.

[0073] See also Figure 8, when the phase is 0°, the current on the outer edge of the radiator 10 is symmetrically distributed about the first center line L1, that is, the phases of the currents on both sides of the first center line L1 are the same. A part of the current flows from the feeder A located at the first target point G1 along the first side 11 to the second target point G2. The currents at the first target point G1 and the second target point G2 are weak currents, and the current near the third target point G3 is a strong current, that is, the current mode of 1 / 2 wavelength is a current mode that is weak at both ends and strong in the middle. Correspondingly, another part of the current flows from the feeder A of the first target point G1 to the second target point G2 along the second side 12. The currents at the first target point G1 and the second target point G2 are weak currents, and the current near the fourth target point G4 is a strong current, that is, the current mode of 1 / 2 wavelength is a current mode that is weak at both ends and strong in the middle. The above two parts of the current are combined at the 0° phase to form a strong current with the overall direction vertically downward (opposite to the Y axis).

[0074] See also Fig. 9 , when the phase is 90°, the current on the outer edge of the radiator 10 is symmetrically distributed about the first center line L1, that is, the phases of the currents on both sides of the first center line L1 are the same. A part of the current flows from the second target point G2 along the first side 11 to the first target point G1, the currents at the first target point G1 and the second target point G2 are weak currents, and the current near the third target point G3 is a relatively strong current (relative to the current at 0° phase, which is a weak current), that is, the current mode of 1 / 2 wavelength is a current mode that is weak at both ends and strong in the middle. Correspondingly, another part of the current flows from the second target point G2 along the second side 12 to the first target point G1, the currents at the first target point G1 and the second target point G2 are weak currents, and the current near the fourth target point G4 is a relatively strong current, that is, the current mode of 1 / 2 wavelength is a current mode that is weak at both ends and strong in the middle. The above two parts of the current are combined at a 90° phase to form a weak current with an overall direction vertically upward (positive direction of the Y axis).

[0075] In terms of current intensity, the current intensity of the third target point G3 and the fourth target point G4 is the largest at a phase of 0°, and the current intensity is the smallest at a phase of 90°. The current distribution at a phase of 180° is opposite in direction to that at a phase of 0°, and has similar intensity, that is, the 180° phase forms a strong current with an overall direction vertically upward (positive direction of the Y axis), and so on, the current resonates up and down along the outer edge of the radiator 10. The antenna in this embodiment has the same or opposite directions of current pairs when the phase difference is 90°, and a circularly polarized wave cannot be formed. The current mode of the above antenna is a linear polarization mode, and the antenna at this time is a linearly polarized antenna.

[0076] The following is an example of the capacitor structure 20 provided in the embodiment of the present application, with reference to the accompanying drawings. The first phase is 0° and the second phase is 90°.

[0077] The signal source 30 excites the radiator 10 to form a target resonant mode, wherein the current of the target resonant mode includes a first resonant current I1 and a second resonant current I2, wherein the first resonant current I1 is the resonant current on the radiator 10 when the target resonant mode is in a phase of 0°, and the second resonant current I2 is the resonant current on the radiator 10 when the target resonant mode is in a phase of 90°.

[0078] See also Figure 5 , the first resonant current I1 includes a first sub-current Q1 distributed on the first side 11 and a second sub-current Q2 distributed on the second side 12. The first sub-current Q1 is a resonant current on the first side 11 at a 0° phase, and the second sub-current Q2 is a resonant current on the second side 12 at a 0° phase.

[0079] See also Figure 8 , in an antenna without a capacitor structure 20, the resonant current on the first side 11 at a phase of 0° and the resonant current on the second side 12 at a phase of 0° are symmetrical currents. In the antenna assembly 100 provided with a capacitor structure 20 in an embodiment of the present application, the first sub-current Q1 and the second sub-current Q2 are asymmetric about the first center line L1, and the strong current distribution position of the first sub-current Q1 and the strong current distribution position of the second sub-current Q2 are not symmetrical about the first center line L1. Furthermore, the phase of the first sub-current Q1 is different from the phase of the second sub-current Q2. The first sub-current Q1 and the second sub-current Q2 will be described in detail later.

[0080] See also Figure 6 , the second resonant current I2 includes a third sub-current Q3 distributed along the first side 11 and a fourth sub-current Q4 distributed along the second side 12. The third sub-current Q3 is a resonant current on the first side 11 at a phase of 90°, and the fourth sub-current Q4 is a resonant current on the second side 12 at a phase of 90°.

[0081] See also Fig. 9 , in an antenna without a capacitor structure 20, the resonant current on the first side 11 at a phase of 90° and the resonant current on the second side 12 at a phase of 90° are symmetrical currents. In the antenna assembly 100 provided with a capacitor structure 20 in an embodiment of the present application, the third sub-current Q3 and the fourth sub-current Q4 are asymmetric about the first center line L1, and the strong current distribution position of the third sub-current Q3 and the strong current distribution position of the fourth sub-current Q4 are not symmetric about the first center line L1. Furthermore, the phase of the third sub-current Q3 is different from the phase of the fourth sub-current Q4. The third sub-current Q3 and the fourth sub-current Q4 will be described in detail later.

[0082] In the embodiment of the present application, a grounded capacitor structure 20 is set in the area where the antenna assembly 100 deviates from the first center line L1. The capacitor structure 20 is used to change the current distribution pattern originally symmetrically set on the radiator 10, so that the current distribution on the radiator 10 in the first phase and the second phase is no longer symmetrical about the first center line L1. Furthermore, the capacitance value of the capacitor structure 20 is tuned to a suitable capacitance value according to the target frequency band, so that the current in the first phase and the second phase with a difference of nearly 90° form a nearly vertical current pair, thereby forming a circularly polarized wave.

[0083] The following is a detailed description of the tuning effect of the capacitor structure 20 located at different positions on the current distribution on the radiator 10 in conjunction with the accompanying drawings.

[0084] For details, please refer to Figure 7 , the second center line L2 and the first center line L1 divide the radiator 10 into a first quadrant area N1, a second quadrant area N2, a third quadrant area N3 and a fourth quadrant area N4. The first quadrant area N1 and the second quadrant area N2 are formed by the first side 11 and the first center line L1. The distance between the first quadrant area N1 and the feeder A is smaller than the distance between the second quadrant area N2 and the feeder A. The third quadrant area N3 and the fourth quadrant area N4 are formed by the second side 12 and the first center line L1. The distance between the third quadrant area N3 and the feeder A is smaller than the distance between the fourth quadrant area N4 and the feeder A.

[0085] Taking the circular radiator 10 as an example, the first quadrant area N1, the second quadrant area N2, the third quadrant area N3 and the fourth quadrant area N4 are all 1 / 4 circles, among which the first quadrant area N1 is a 1 / 4 circle in the upper left corner, and the second quadrant area N2 is a 1 / 4 circle in the lower left corner; the third quadrant area N3 is a 1 / 4 circle in the upper right corner, and the fourth quadrant area N4 is a 1 / 4 circle in the lower right corner.

[0086] Taking the radiator 10 as a rectangle as an example, the first quadrant area N1, the second quadrant area N2, the third quadrant area N3 and the fourth quadrant area N4 are all 1 / 4 rectangles of the radiator 10, among which the first quadrant area N1 is a 1 / 4 rectangle of the upper left corner, the second quadrant area N2 is a 1 / 4 rectangle of the lower left corner; the third quadrant area N3 is a 1 / 4 rectangle of the upper right corner, and the fourth quadrant area N4 is a 1 / 4 rectangle of the lower right corner.

[0087] Taking the radiator 10 as an example, the upper half is a semicircle and the lower half is a semirectangle, wherein the first quadrant area N1 is a 1 / 4 circle in the upper left corner, and the second quadrant area N2 is a 1 / 4 rectangle in the lower left corner; the third quadrant area N3 is a 1 / 4 circle in the upper right corner, and the fourth quadrant area N4 is a 1 / 4 rectangle in the lower right corner.

[0088] The tuning part B is located in at least one of the first quadrant N1, the second quadrant N2, the third quadrant N3 and the fourth quadrant N4. That is, the capacitor structure 20 can be located in one or more of the above four quadrants. In this embodiment, the capacitor structure 20 is set in one quadrant as an example. In addition, it is defined that more than half of the area on the tuning part B is located in a quadrant, then the tuning part B is determined to be in the quadrant.

[0089] The embodiment of the present application analyzes the setting position of the provided capacitor structure 20. When the capacitor structure 20 is set in different quadrants, the tuning effect on the resonant current is different, and thus the circularly polarized waves formed are also different. For example, the position of the capacitor structure 20 affects whether the circularly polarized wave is left-handed or right-handed, so as to facilitate the design of the antenna component 100 with the required circularly polarized wave.

[0090] Optionally, the feeder A may be located at the first target point G1, between the first target point G1 and the center of the first center line L1, the second target point G2, and between the second target point G2 and the center of the first center line L1. The feeder A is located at the first center line L1 to form an initial current mode of a bilaterally symmetrical current distribution, making it easier to adjust the circular polarization performance by adjusting the position of the capacitor structure 20. The following embodiments take the feeder A being located at the first target point G1 or between the first target point G1 and the midpoint of the first center line L1 as an example, and further take the feeder A being located at the first target point G1 as an example.

[0091] In the first embodiment

[0092] See also Fig.10 and Fig.11 , the tuning part B is located in the first quadrant N1. The capacitor structure 20 is electrically connected to the radiator 10 in the first quadrant N1. The capacitor structure 20 is used to advance the phase of the current relatively close to the capacitor structure 20, that is, the capacitor structure 20 is used to advance the phase of the first sub-current Q1 at a phase of 0°, and to advance the phase of the third sub-current Q3 at a phase of 90°. In other words, the capacitor structure 20 is used to make the phase of the first sub-current Q1 greater than the phase of the second sub-current Q2, and to make the phase of the third sub-current Q3 greater than the phase of the fourth sub-current Q4.

[0093] The present application does not make any specific limitation on the leading phase degree of the first sub-current Q1. Optionally, the leading phase degree of the first sub-current Q1 is 0°-90°. For example, the leading phase degree of the first sub-current Q1 is 45°, or 90°.

[0094] See also Fig.10, in the first phase (i.e., 0° phase), the distance between the strong current area of ​​the first sub-current Q1 and the second target point G2 is less than the distance between the strong current area of ​​the first sub-current Q1 and the first target point G1. Before the capacitor structure 20 is set, the strong current of the first sub-current Q1 with a 0° phase is distributed in the area of ​​the first side 11 close to the third target point G3. After the capacitor structure 20 is set, the strong current of the first sub-current Q1 with a 0° phase is distributed between the third target point G3 and the second target point G2. That is, the strong current area of ​​the first sub-current Q1 is distributed on the lower left side (the first side 11 corresponding to the second quadrant area N2). The strong current direction of the first sub-current Q1 is the direction pointing to the second target point G2. The first sub-current Q1 has a rightward lateral current component and a downward (Y-axis opposite) longitudinal current component. The lateral direction is the direction of the second center line L2, and the longitudinal direction is the direction of the first center line L1.

[0095] The strong current of the second sub-current Q2 is distributed at the position where the second center line L2 intersects with the second side 12 (near the third target point G3). Since the distance between the capacitor structure 20 and the second sub-current Q2 is relatively far, the capacitor structure 20 has basically no effect on the phase of the second sub-current Q2. In the implementation mode where the capacitor structure 20 is not provided and the capacitor structure 20 is provided, the strong current of the second sub-current Q2 with a phase of 0° still remains distributed near the second target point G2 (distributed on the second side 12 corresponding to the third quadrant N3). The strong current direction of the second sub-current Q2 is the direction pointing to the second target point G2. According to the components of the first sub-current Q1 and the second sub-current Q2, it can be seen that the main direction of the first resonant current I1 is the direction from the first target point G1 to the second target point G2. In other words, the main current direction of the first resonant current I1 is the longitudinal direction, and it also includes a small amount of transverse current components.

[0096] See also Fig.11 In the second phase (ie, the 90° phase), the current in the 90° phase is reversed compared to the 0° phase, and the current intensity is also reversed accordingly.

[0097] For the current of the first side 11, the current intensity of the area of ​​the first side 11 close to the first target point G1 is flipped to a strong current distribution area at a 90° phase. The first part of the strong current Q31 of the third sub-current Q3 is distributed in the area of ​​the first side 11 close to the first target point G1, and the direction of the first part of the strong current Q31 of the third sub-current Q3 is the direction of flowing toward the first target point G1 (i.e., horizontally to the right).

[0098] Due to the influence of the capacitor structure 20, the first sub-current Q1 has a transverse component and a longitudinal component between the third target point G3 and the second target point G2 at a phase of 0°. The current of the longitudinal component flips to an extremely weak current at a phase of 90°, and the current of the transverse component flips to a strong current at a phase of 90°. Therefore, the second part of the strong current Q32 of the third sub-current Q3 is distributed in the area of ​​the first side 11 close to the second target point G2, and flows to the second target point G2 (i.e., transversely to the right, i.e., the positive direction of the X-axis).

[0099] At the 0° phase, the area of ​​the second side 12 close to the second target point G2 is a weak current. At the 90° phase, after the current intensity is reversed, the strong current of the fourth sub-current Q4 is distributed in the area of ​​the second side 12 close to the second target point G2, and the strong current direction of the fourth sub-current Q4 is away from the second target point G2 (i.e., horizontally to the right, which is also the positive direction of the X-axis).

[0100] Combining the third sub-current Q3 and the fourth sub-current Q4 , it can be known that the main direction of the second resonant current I2 is along the second center line L2 and points from the first side 11 to the second side 12 (laterally to the right).

[0101] The current distribution of the 180° phase is opposite to that of the 0° phase, but has similar strengths, i.e., the 180° phase forms a strong current with an overall vertically upward direction (positive direction of the Y axis), and the current distribution of the 270° phase is opposite to that of the 90° phase, but has similar strengths, i.e., the 270° phase forms a strong current with an overall horizontally leftward direction (negative direction of the X axis), and so on. The current directions of the 0° phase, 90° phase, 180° phase, and 270° phase are, respectively: downward (negative direction of the Y axis), rightward, upward (positive direction of the Y axis), and leftward (negative direction of the X axis), thereby forming a rotating current that rotates dynamically to the right.

[0102] The first resonant current I1 with a phase of 0° and the second resonant current I2 with a phase of 90° form a right-hand circularly polarized wave. Of course, the resonant currents with a phase of 90° and 180° also form circularly polarized waves, and the resonant currents with a phase of 180° and 270° also form circularly polarized waves.

[0103] In the embodiment of the present application, by setting the capacitor structure 20, the capacitor structure 20 forms a perturbation on the current on the left and right sides, so that the current phase on both sides of the first center line L1 of the radiator 10 changes, forming an asymmetric current distribution. Specifically, the current intensity downward (Y-axis reverse) is the largest at a 0° phase, the horizontal current to the right (X positive) is the largest at a 90° phase, the current intensity upward (Y-axis positive) is the largest at a 180° phase, and the horizontal current to the left (X reverse) is the largest at a 270° phase, which is a right-hand circular polarization mode.

[0104] See also Fig.12 and Fig.13 , Fig.12 is the axial ratio of the antenna without the capacitor structure 20 according to the embodiment of the present application (side view); Fig.13 : is the axial ratio (side view) of the antenna assembly 100 provided with the capacitor structure 20 in the embodiment of the present application. The left side of the side view is the back cover side, and the right side is the display screen side.

[0105] It can be seen that the axial ratio of the antenna without the capacitor structure 20 is greater than 30dB in all directions, and has no circular polarization characteristics. However, the axial ratio of the antenna assembly 100 loaded with the capacitor structure 20 is less than 3dB in the direction perpendicular to the back cover, has circular polarization characteristics, and the main radiation direction of the circularly polarized wave is perpendicular to the back cover and away from the display screen.

[0106] See also Fig.14 , Fig.14 2 is the gain and left / right circular polarization gain diagram of the antenna without the capacitor structure 20 in the embodiment of the present application. Curve a is the gain of the antenna without the capacitor structure 20 in the embodiment of the present application. Curve b is the left / right circular polarization gain of the antenna without the capacitor structure 20 in the embodiment of the present application. It can be seen that the gain of the antenna without the capacitor structure 20 is 3dB higher than the circular polarization gain, which is consistent with the conventional linear polarization antenna.

[0107] See also Fig.15 , Fig.15 1 is a graph of the gain, left-hand circular polarization gain, and right-hand circular polarization gain of the antenna provided with the capacitor structure 20 according to the embodiment of the present application. Curve a is the gain of the antenna provided with the capacitor structure 20 according to the embodiment of the present application. Curve b is the left-hand circular polarization gain of the antenna provided with the capacitor structure 20 according to the embodiment of the present application. Curve c is the right-hand circular polarization gain of the antenna provided with the capacitor structure 20 according to the embodiment of the present application.

[0108] It can be seen that the gain of the antenna assembly 100 provided with the capacitor structure 20 is substantially equal to the right circular polarization gain near 2.4 GHz-2.5 GHz, while the left circular polarization gain in this frequency band is suppressed below -2 dB, with good circular polarization purity.

[0109] In the second embodiment

[0110] See also Fig.16 and Fig.17, the tuning part B is located in the second quadrant N2. The capacitor structure 20 is electrically connected to the radiator 10 in the second quadrant N2. The capacitor structure 20 is used to lag the phase of the current relatively close to the capacitor structure 20, that is, the capacitor structure 20 is used to lag the phase of the first sub-current Q1 at a 0° phase, and lag the phase of the third sub-current Q3 at a 90° phase. In other words, the capacitor structure 20 is used to make the phase of the first sub-current Q1 smaller than the phase of the second sub-current Q2. And make the phase of the third sub-current Q3 smaller than the phase of the fourth sub-current Q4.

[0111] The present application does not make any specific limitation on the lagging phase degree of the first sub-current Q1. Optionally, the lagging phase degree of the first sub-current Q1 is 0°-90°. Further, the lagging phase degree of the first sub-current Q1 is 20°-70°. Further, the lagging phase degree of the first sub-current Q1 is about 45 degrees.

[0112] See also Fig.16 , in the first phase (i.e., 0° phase), the distance between the strong current area of ​​the first sub-current Q1 and the first target point G1 is less than the distance between the strong current area of ​​the first sub-current Q1 and the second target point G2. Before the capacitor structure 20 is set, the strong current of the first sub-current Q1 with a 0° phase is distributed in the area of ​​the first side 11 close to the third target point G3. After the capacitor structure 20 is set, the strong current of the first sub-current Q1 with a 0° phase is distributed between the first target point G1 and the third target point G3. That is, the strong current area of ​​the first sub-current Q1 is distributed on the upper left side (the first side 11 corresponding to the first quadrant area N1). The strong current direction of the first sub-current Q1 is the direction pointing to the second target point G2. The first sub-current Q1 has a lateral current component facing left (X reverse) and a longitudinal current component facing downward. The lateral direction is the direction of the second center line L2, and the longitudinal direction is the direction of the first center line L1.

[0113] The strong current of the second sub-current Q2 is distributed at the position where the second center line L2 intersects the second side 12. Since the distance between the capacitor structure 20 and the second sub-current Q2 is relatively far, the capacitor structure 20 has basically no effect on the phase of the second sub-current Q2. In the implementation mode where the capacitor structure 20 is not provided and the capacitor structure 20 is provided, the strong current of the second sub-current Q2 with a phase of 0° still remains distributed near the second target point G2 (distributed on the second side 12 corresponding to the third quadrant N3). The strong current direction of the second sub-current Q2 is the direction pointing to the second target point G2. According to the components of the first sub-current Q1 and the second sub-current Q2, it can be seen that the main direction of the first resonant current I1 is the direction from the first target point G1 to the second target point G2. In other words, the main current direction of the first resonant current I1 is the longitudinal direction, and it also includes a small amount of transverse current components.

[0114] See also Fig.17 In the second phase (ie, the 90° phase), the current in the 90° phase is reversed compared to the 0° phase, and the current intensity is also reversed accordingly.

[0115] For the current of the first side 11, the current intensity of the area of ​​the first side 11 close to the second target point G2 is flipped to a strong current distribution area at a 90° phase. The first part of the strong current Q31 of the third sub-current Q3 is distributed in the area of ​​the second side 12 close to the second target point G2. The direction of the first part of the strong current Q31 of the third sub-current Q3 is away from the second target point G2 (i.e., horizontally to the left, i.e., in the opposite direction of the X-axis).

[0116] Due to the influence of the capacitor structure 20, the first sub-current Q1 has a transverse component and a longitudinal component between the third target point G3 and the first target point G1 at a phase of 0°. The current of the longitudinal component flips to an extremely weak current at a phase of 90°, and the current of the transverse component flips to a strong current at a phase of 90°. Therefore, the second part of the strong current Q32 of the third sub-current Q3 is located in the area of ​​the first side 11 close to the first target point G1, and away from the first target point G1 (i.e., horizontally to the left, i.e., in the opposite direction of the X-axis).

[0117] The strong current of the fourth sub-current Q4 at the 90° phase is distributed from the fourth target point G4 to the second target point G2 and is directed toward the second target point G2. The main current direction of the fourth sub-current Q4 is horizontally to the left (opposite to the X-axis).

[0118] Combining the third sub-current Q3 and the fourth sub-current Q4 , it can be seen that the main direction of the second resonant current I2 is along the second center line L2 and points from the second side 12 to the first side 11 (laterally to the left, ie, opposite to the X-axis).

[0119] The current distribution of the 180° phase is opposite to that of the 0° phase, but has similar strengths, i.e., the 180° phase forms a strong current with an overall vertically upward direction (positive direction of the Y axis), and the current distribution of the 270° phase is opposite to that of the 90° phase, but has similar strengths, i.e., the 270° phase forms a strong current with an overall horizontal rightward direction, and so on. The current directions of the 0° phase, 90° phase, 180° phase, and 270° phase are, respectively: downward (negative direction of the Y axis), leftward (negative direction of the X axis), upward (positive direction of the Y axis), and rightward, thereby forming a rotating current that rotates dynamically to the left.

[0120] The first resonant current I1 with a phase of 0° and the second resonant current I2 with a phase of 90° form a left-hand circularly polarized wave. Of course, the resonant currents with a phase of 90° and 180° also form circularly polarized waves, and the resonant currents with a phase of 180° and 270° also form circularly polarized waves.

[0121] The embodiment of the present application forms left-hand circular polarization by setting the capacitor structure 20 in the second quadrant area N2 of the radiator 10, that is, the lower left corner of the radiator 10, wherein the radiator 10 can be equivalent to a series LC circuit, and the capacitor structure 20 in the present application can be equivalent to a parallel capacitor. That is, the antenna assembly 100 of the present application is an LC circuit + parallel capacitor. The change of the capacitor structure 20 is the change of the position of the parallel capacitor in the LC circuit. In this way, the phase of the resonant current of the entire resonant circuit will also be affected by the parallel capacitor, so that the current phase is regulated. After the current phase changes, the direction of the transverse current component also changes, and then the overall current direction at the 90° phase also changes. The embodiment of the present application can determine the position of the capacitor structure 20 according to the requirements of different circularly polarized waves.

[0122] In the third embodiment

[0123] See also Fig.18 and Fig.19 , the tuning part B is located in the third quadrant N3. The capacitor structure 20 is electrically connected to the radiator 10 in the third quadrant N3. The capacitor structure 20 is used to advance the phase of the current relatively close to the capacitor structure 20, that is, the capacitor structure 20 is used to advance the phase of the second sub-current Q2 at a 0° phase, and to advance the phase of the fourth sub-current Q4 at a 90° phase. In other words, the capacitor structure 20 is used to make the phase of the second sub-current Q2 greater than the phase of the first sub-current Q1. And make the phase of the fourth sub-current Q4 greater than the phase of the third sub-current Q3.

[0124] The present application does not make any specific limitation on the leading phase degree of the second sub-current Q2. Optionally, the leading phase degree of the second sub-current Q2 is 0°-90°. Further, the leading phase degree of the second sub-current Q2 is 20°-70°. Further, the leading phase degree of the second sub-current Q2 is about 45 degrees.

[0125] See also Fig.18 , in the first phase (i.e., 0° phase), the distance between the strong current area of ​​the second sub-current Q2 and the second target point G2 is less than the distance between the strong current area of ​​the second sub-current Q2 and the first target point G1. Before the capacitor structure 20 is set, the strong current of the second sub-current Q2 of the 0° phase is distributed in the area of ​​the second side 12 close to the fourth target point G4. After the capacitor structure 20 is set, the strong current of the second sub-current Q2 of the 0° phase is distributed between the fourth target point G4 and the second target point G2. That is, the strong current area of ​​the second sub-current Q2 is distributed on the lower right side (the second side 12 corresponding to the fourth quadrant area N4). The strong current direction of the second sub-current Q2 is the direction pointing to the second target point G2. The second sub-current Q2 has a lateral current component to the left (opposite to the X-axis) and a longitudinal current component downward (opposite to the Y-axis). The lateral direction is the direction of the second center line L2, and the longitudinal direction is the direction of the first center line L1.

[0126] The strong current of the first sub-current Q1 is distributed at the position where the second center line L2 intersects with the first side 11 (near the third target point G3). Since the distance between the capacitor structure 20 and the first sub-current Q1 is relatively far, the capacitor structure 20 has basically no effect on the phase of the first sub-current Q1. In the implementation mode where the capacitor structure 20 is not provided and the capacitor structure 20 is provided, the strong current of the first sub-current Q1 with a phase of 0° still remains distributed near the second target point G2 (distributed on the first side 11 corresponding to the first quadrant N1). The strong current direction of the first sub-current Q1 is the direction pointing to the second target point G2. According to the components of the second sub-current Q2 and the first sub-current Q1, it can be seen that the main direction of the first resonant current I1 is the direction from the first target point G1 to the second target point G2 (Y-axis reverse). In other words, the main current direction of the first resonant current I1 is the longitudinal direction, and also includes a small amount of transverse current component.

[0127] See also Fig.19 In the second phase (ie, the 90° phase), the current in the 90° phase is reversed compared to the 0° phase, and the current intensity is also reversed accordingly.

[0128] For the current of the second side 12, the current intensity of the area of ​​the second side 12 close to the first target point G1 is flipped to a strong current distribution area at a 90° phase. The first part of the strong current Q41 of the fourth sub-current Q4 is distributed in the area of ​​the second side 12 close to the first target point G1, and the direction of the first part of the strong current Q41 of the fourth sub-current Q4 is the direction of flowing toward the first target point G1 (i.e., horizontally to the left, i.e., in the opposite direction of the X-axis).

[0129] Due to the influence of the capacitor structure 20, the second sub-current Q2 has a transverse component and a longitudinal component between the fourth target point G4 and the second target point G2 at a phase of 0°. The current of the longitudinal component flips to an extremely weak current at a phase of 90°, and the current of the transverse component flips to a strong current at a phase of 90°. Therefore, the second part of the strong current Q42 of the fourth sub-current Q4 is distributed in the area of ​​the second side 12 close to the second target point G2, and flows toward the second target point G2 (i.e., horizontally to the left, i.e., in the opposite direction of the X-axis).

[0130] At the 0° phase, the area of ​​the first side 11 close to the second target point G2 is a weak current. At the 90° phase, after the current intensity is reversed, the strong current of the third sub-current Q3 is distributed in the area of ​​the first side 11 close to the second target point G2, and the strong current direction of the third sub-current Q3 is away from the second target point G2 (i.e., horizontally to the left, that is, in the opposite direction of the X-axis).

[0131] Combining the fourth sub-current Q4 with the third sub-current Q3, it can be seen that the main direction of the second resonant current I2 (the direction of the main current) is along the second center line L2 and points from the second side 12 to the first side 11 (laterally to the left, i.e., in the opposite direction of the X-axis).

[0132] The current distribution of the 180° phase is opposite to that of the 0° phase, but has similar strengths, that is, the 180° phase forms a strong current with an overall vertically upward direction (positive direction of the Y axis), and the current distribution of the 270° phase is opposite to that of the 90° phase, but has similar strengths, that is, the 270° phase forms a strong current with an overall horizontal rightward direction (positive direction of the X axis), and so on. The current directions of the 0° phase, 90° phase, 180° phase, and 270° phase are, respectively: downward (negative direction of the Y axis), leftward (negative direction of the X axis), upward (positive direction of the Y axis), and rightward (positive direction of the X axis), thereby forming a rotating current that rotates dynamically to the left.

[0133] The first resonant current I1 with a phase of 0° and the second resonant current I2 with a phase of 90° form a left-hand circularly polarized wave. Of course, the resonant currents with a phase of 90° and 180° also form circularly polarized waves, and the resonant currents with a phase of 180° and 270° also form circularly polarized waves.

[0134] In the fourth embodiment

[0135] See also Fig. 20 and Fig.21 , the tuning part B is located in the fourth quadrant N4. The capacitor structure 20 is electrically connected to the radiator 10 in the fourth quadrant N4. The capacitor structure 20 is used to lag the phase of the current relatively close to the capacitor structure 20, that is, the capacitor structure 20 is used to lag the phase of the second sub-current Q2 at a 0° phase, and lag the phase of the fourth sub-current Q4 at a 90° phase. In other words, the capacitor structure 20 is used to make the phase of the second sub-current Q2 smaller than the phase of the first sub-current Q1. And make the phase of the fourth sub-current Q4 smaller than the phase of the third sub-current Q3.

[0136] The present application does not make any specific limitation on the lagging phase degree of the second sub-current Q2. Optionally, the lagging phase degree of the second sub-current Q2 is 0°-90°. Further, the lagging phase degree of the second sub-current Q2 is 20°-70°. Further, the lagging phase degree of the second sub-current Q2 is about 45 degrees.

[0137] See also Fig. 20 , in the first phase (i.e., 0° phase), the distance between the strong current area of ​​the second sub-current Q2 and the first target point G1 is less than the distance between the strong current area of ​​the second sub-current Q2 and the second target point G2. Before the capacitor structure 20 is set, the strong current of the second sub-current Q2 of the 0° phase is distributed in the area of ​​the second side 12 close to the fourth target point G4. After the capacitor structure 20 is set, the strong current of the second sub-current Q2 of the 0° phase is distributed between the fourth target point G4 and the first target point G1. That is, the strong current area of ​​the second sub-current Q2 is located on the upper right side (the second side 12 corresponding to the third quadrant area N3). The strong current direction of the second sub-current Q2 is the direction away from the first target point G1. The second sub-current Q2 has a lateral current component to the right (positive direction of the X axis) and a longitudinal current component downward (negative direction of the Y axis). The lateral direction is the direction of the second center line L2, and the longitudinal direction is the direction of the first center line L1.

[0138] The strong current of the first sub-current Q1 is located at the intersection of the second center line L2 and the first side 11 (near the third target point G3). Since the distance between the capacitor structure 20 and the first sub-current Q1 is relatively far, the capacitor structure 20 has basically no effect on the phase of the first sub-current Q1. In the implementation mode where the capacitor structure 20 is not provided and the capacitor structure 20 is provided, the strong current of the first sub-current Q1 with a phase of 0° still remains distributed near the second target point G2 (distributed on the first side 11 corresponding to the first quadrant N1). The strong current direction of the first sub-current Q1 is the direction pointing to the second target point G2. According to the components of the second sub-current Q2 and the first sub-current Q1, it can be seen that the main direction of the first resonant current I1 is the direction from the first target point G1 to the second target point G2 (Y-axis reverse). In other words, the main current direction of the first resonant current I1 is the longitudinal direction, and also includes a small amount of transverse current components.

[0139] See also Fig.21 In the second phase (ie, the 90° phase), the current in the 90° phase is reversed compared to the 0° phase, and the current intensity is also reversed accordingly.

[0140] For the current of the second side 12, the current intensity of the area of ​​the second side 12 close to the second target point G2 is flipped to a strong current distribution area at a 90° phase. The first part of the strong current Q41 of the fourth sub-current Q4 is distributed in the area of ​​the second side 12 close to the second target point G2, and the direction of the first part of the strong current Q41 of the fourth sub-current Q4 is the direction of flowing toward the first target point G1 (i.e., horizontally to the right, i.e., the positive direction of the X-axis).

[0141] Due to the influence of the capacitor structure 20, the second sub-current Q2 has a transverse component and a longitudinal component between the fourth target point G4 and the second target point G2 at a phase of 0°. The current of the longitudinal component flips to an extremely weak current at a phase of 90°, and the current of the transverse component flips to a strong current at a phase of 90°. Therefore, the second part of the strong current Q42 of the fourth sub-current Q4 is distributed in the area of ​​the second side 12 close to the first target point G1, and flows to the second target point G2 (i.e., transversely to the right, i.e., the positive direction of the X-axis).

[0142] At the 0° phase, the area of ​​the first side 11 close to the second target point G2 is a weak current. At the 90° phase, after the current intensity is reversed, the strong current of the third sub-current Q3 is distributed in the area of ​​the first side 11 close to the second target point G2, and the strong current direction of the third sub-current Q3 is toward the second target point G2 (i.e., horizontally to the right, that is, the positive direction of the X-axis).

[0143] Combining the fourth sub-current Q4 with the third sub-current Q3 , it can be seen that the main direction of the second resonant current I2 (the direction of the main current) is along the second center line L2 and points from the first side 11 to the second side 12 (laterally to the right).

[0144] The current distribution of the 180° phase is opposite to that of the 0° phase, but has similar strengths, that is, the 180° phase forms a strong current with an overall vertically upward direction (positive direction of the Y axis), and the current distribution of the 270° phase is opposite to that of the 90° phase, but has similar strengths, that is, the 270° phase forms a strong current with an overall horizontally leftward direction (negative direction of the X axis), and so on. The current directions of the 0° phase, 90° phase, 180° phase, and 270° phase are: downward (negative direction of the Y axis), rightward (positive direction of the X axis), upward (positive direction of the Y axis), and leftward (negative direction of the X axis), thereby forming a rotating current that rotates dynamically to the right.

[0145] The first resonant current I1 with a phase of 0° and the second resonant current I2 with a phase of 90° form a right-hand circularly polarized wave. Of course, the resonant currents with a phase of 90° and 180° also form circularly polarized waves, and the resonant currents with a phase of 180° and 270° also form circularly polarized waves.

[0146] In summary, the feeding part A is located at the upper edge of the radiator 10, and the capacitor structure 20 is located at the upper left corner of the radiator 10. When the radiator 10 antenna is excited, the current phase around one side of the capacitor structure 20 will be ahead of the other side, so that right-hand circular polarization is generated (the current distribution is left side → lower side (0° phase) → right side (90° phase) → upper side). On the contrary, when the capacitor structure 20 is located at the upper right corner of the radiator 10, left-hand circular polarization is generated. (2) When the capacitor structure 20 is far away from the feeding part A (that is, located at the lower left corner or lower right corner of the radiator 10), the above conclusion will be opposite (that is, the capacitor structure 20 located at the lower left corner of the radiator 10 generates left-hand circular polarization, and the capacitor structure 20 located at the lower right corner of the radiator 10 generates right-hand circular polarization). This is because the current phase around one side of the capacitor structure 20 is reversed, and the original phase lead becomes a lag.

[0147] The present application does not limit the target frequency band supported by the antenna assembly 100. The equivalent electrical length of the radiator 10 antenna is close to half the wavelength of the target frequency band. The size of the radiator 10 can be designed according to actual needs to support the target frequency band required to be supported.

[0148] The present application does not specifically limit the capacitance value of the capacitor structure 20. The capacitance value of the capacitor structure 20 is affected by the size of the target frequency band supported and the specific position of the capacitor structure 20. In the embodiment of the present application, the capacitance value of the capacitor structure 20 can enable the antenna assembly 100 to form a circularly polarized wave with good effect in the target frequency band.

[0149] Generally, circularly polarized mobile phone antennas for satellite communication applications currently have the problem of being large in size and difficult to conform to the design of mobile phones. For example, the antenna part is a cylindrical structure with a large overall size. In addition, the satellite antenna is in the shape of an unfolded flat plate, which also occupies a large volume. The current satellite terminal antenna occupies a large size and is difficult to integrate into the electronic device 1000.

[0150] In the embodiment of the present application, the antenna assembly 100 is mainly flat, thin and has a small area of ​​the radiator 10, and is suitable for electronic devices 1000 such as mobile phones and smart watches that have a small thickness and a relatively large plane space.

[0151] See also Fig. 22 The electronic device 1000 provided in an embodiment of the present application includes a back cover 400, a conductor 600 and the antenna assembly 100 described in any one of the above-mentioned embodiments.

[0152] See also Fig. 22 , the radiator 10 is disposed on the back cover 400. Specifically, the radiator 10 may conform to the back cover 400 to reduce the space occupied by the radiator 10 in the electronic device 1000, thereby realizing the multi-purpose of the back cover 400.

[0153] The portion of the radiator 10 that is opposite to the conductor 600 and whose spacing is smaller than the preset spacing is the tuning portion B, and the conductor 600 is grounded. The present application does not limit the preset spacing, and the preset spacing is optionally 0.02λ, where λ is the wavelength of the target frequency band.

[0154] At least part of the radiator 10 is opposite to the conductor 600 and the distance between the radiator 10 and the conductor 600 is less than the preset distance, so as to form the capacitor structure 20. That is, the capacitor structure 20 is formed between the tuning part B and the conductor 600. In other words, the capacitor structure 20 in the antenna assembly 100 is also formed by the conductor 600 in the electronic device 1000 and the radiator 10 on the back cover 400 with a smaller distance and a certain relative area. That is, the capacitor structure 20 also reuses the radiator 10 on the back cover 400, and reuses the conductor 600 in the electronic device 1000.

[0155] The present application does not limit the specific structure of the conductor 600. Optionally, the conductor 600 can be arranged on the back cover 400 for protection, or to improve the appearance texture, or to dissipate heat, etc.; in addition, the conductor 600 can also improve the appearance texture of the shell; the conductor 600 can also serve as a heat sink in the shell.

[0156] In an alternative embodiment, see Fig.23 and Fig.24The electronic device 1000 further includes a camera module 700 and a camera decoration 410. The camera module 700 includes a camera 710 and a camera conductive housing 720 disposed around the camera 710, and the camera conductive housing 720 is grounded.

[0157] The camera decoration 410 is embedded in the through hole of the back cover 400. The camera decoration 410 has a light-transmitting portion for transmitting light to the camera 710. At least part of the camera decoration 410 is arranged opposite to the camera conductive housing 720. The part or all of the camera conductive housing 720 opposite to the camera decoration 410 is the conductor 600, and the camera decoration 410 is the radiator 10.

[0158] The camera decoration piece 410 is made of a conductive material, and further, the camera decoration piece 410 is made of a metal material. The radiator 10 in the antenna assembly 100 reuses the camera decoration piece 410 on the back cover 400 .

[0159] By setting the camera decoration 410 in the back cover 400 as the radiator 10 of the antenna assembly 100, the camera decoration 410 in the back cover 400 can be fully utilized. In addition, since the camera decoration 410 of the back cover 400 has a relatively large area, it can support a wider range of frequency bands, for example, it can support medium and high frequencies, thereby improving the radiation performance of the antenna assembly 100. In addition, setting the camera decoration 410 in the back cover 400 as the radiator 10 of the antenna assembly 100 has better clearance, thereby improving the antenna performance. In addition, the camera decoration 410 in the back cover 400 has a certain distance from other antennas on the electronic device 1000, so that it has better isolation.

[0160] For further information, see Fig.25 and Fig.26 The outer contour of the camera decoration 410 includes, but is not limited to, a circle, a square, a rectangle, a semicircle, and a semirectangle. In other words, the camera decoration 410 has a first center line L1, and the outer contour of the camera decoration 410 is also a symmetrical figure about the first center line L1, which meets the outer contour requirements of the antenna assembly 100 provided in the embodiment of the present application for the radiator 10.

[0161] The camera conductive housing 720 is made of conductive material, and further, the camera conductive housing 720 is made of metal. Generally, since the camera module 700 is installed directly below the camera decorative piece 410, the camera conductive housing 720 is opposite to the camera decorative piece 410 and the distance between them is small, which meets the composition conditions of the capacitor structure 20 in the antenna assembly 100 provided in the embodiment of the present application.

[0162] Generally, the camera conductive housing 720 is grounded to prevent the camera module 700 from being interfered by static electricity. The capacitor structure 20 in this application also needs to be grounded, that is, the camera conductive housing 720 as the capacitor structure 20 does not need to be additionally provided with a grounding path.

[0163] In another embodiment, see Fig. 27 , the camera decoration 410 is attached to the back cover 400, and the camera decoration 410 has a light-transmitting portion for transmitting light to the camera 710, and at least part of the camera decoration 410 is arranged opposite to the camera conductive shell 720. Part or all of the camera conductive shell 720 is the conductor 600, and the camera decoration 410 is the radiator 10. In this embodiment, the back cover 400 can be a light-transmitting cover plate without a through-hole design. Among them, the camera decoration 410 can be set on the back cover 400 by LDS, FPC, printing technology and other processes.

[0164] The antenna assembly 100 provided in the embodiment of the present application is a circularly polarized antenna designed based on the rear camera module and radiator 10 of a mobile phone. The camera decoration 410 made of conductive material is used as the antenna radiator 10, and the conductive shell of the camera module 700 and the camera decoration 410 are relatively close and spaced apart to construct a capacitor structure 20. The capacitor structure 20 changes the current direction and phase of the radiator 10 antenna through the perturbation effect (equivalent capacitor loading effect) on the antenna, thereby realizing a left-handed / right-handed circular polarization mode, which is suitable for satellite communication. The structure of the antenna assembly 100 makes extensive use of the original structure of the electronic device 1000, realizes the circular polarization function with minimal improvement cost, and has good circular polarization performance.

[0165] See also Fig.23 and Fig.24The camera conductive housing 720 includes a metal base + a metal housing (CMOS, lens and other structures have been omitted), and the overall structure is a rectangular metal block with a hollow center. The camera conductive housing 720 is located between the mobile phone middle frame and the radiator 10, and is grounded to the mobile phone middle frame. A certain distance is maintained from the radiator 10, for example, less than 0.02λ, and the bottom of the camera module 700 is grounded (the mobile phone metal middle frame). The feeding part A is located on the first center line L1 of the radiator 10 (close to the edge, not at the center of the first center line L1), and the camera conductive housing 720 is located on the left or right side of the first center line L1 of the radiator 10 (not on the first center line L1). When the camera conductive shell 720 is located on the left side of the first center line L1 of the radiator 10: (1) the camera conductive shell 720 is located on the side close to the feeding part A to form right-hand circular polarization, (2) the camera conductive shell 720 is located on the side away from the feeding part A to form left-hand circular polarization; when the camera conductive shell 720 is located on the right side of the first center line L1 of the radiator 10: (3) the camera conductive shell 720 is located on the side close to the feeding part A to form left-hand circular polarization, (4) the camera conductive shell 720 is located on the side away from the feeding part A to form right-hand circular polarization.

[0166] The overlap area between the camera conductive housing 720 and the camera decorative part 410, and the spacing between the camera conductive housing 720 and the camera decorative part 410 affect the size of the equivalent capacitance of the capacitor structure 20. The larger the overlap area between the camera conductive housing 720 and the camera decorative part 410, the larger the capacitance, and the smaller the gap between the camera conductive housing 720 and the camera decorative part 410, the larger the capacitance. When the equivalent capacitance reaches a certain value, it will cause a large disturbance to the current. If the equivalent capacitance is too small, it will have little effect on the original current distribution. The size of the equivalent capacitance of the capacitor structure 20 can be controlled by partially hollowing out the radiator 10 or adjusting the height of the radiator 10 and the camera conductive housing 720.

[0167] Specifically, at a specific frequency, a certain range of equivalent capacitance is required to have the best circular polarization performance. In the actual process, the distance between the camera conductive housing 720 and the camera decorative member 410 can be determined first, and then the overlapping area between the camera conductive housing 720 and the camera decorative member 410 can be adjusted to make the antenna assembly 100 have the best circular polarization performance.

[0168] When the area of ​​the camera conductive housing 720 is determined and the frequency with the best circular polarization is higher than the target frequency band, the overlapping area between the camera conductive housing 720 and the camera decorative part 410 can be reduced by opening a window on the camera decorative part 410 to reduce the equivalent capacitance and achieve low-frequency regulation.

[0169] When the area of ​​the camera conductive housing 720 is determined and the frequency of the best circular polarization is lower than the target frequency band, a capacitor structure 20 can be formed between the conductive housings of multiple adjacent cameras 710 and the camera decoration 410 to increase the equivalent capacitance and achieve high-frequency adjustment.

[0170] Generally, there are multiple camera modules 700 under the camera decoration 410. To prevent other camera modules 700 from interfering with the circularly polarized radiator 10 antenna designed in this application, the metal part (camera decoration 410) directly above the conductive shell of the irrelevant camera module 700 can be hollowed out by opening a window. Hollowing out reduces the equivalent capacitance, and the hollowed-out area can be filled with glass or plastic. Fig.28 There are three camera modules 700 , the metal parts of the camera decorations 410 above the two upper camera modules 700 are hollowed out, while the metal of the radiator 10 above the lower camera module 700 is not hollowed out.

[0171] For details, please refer to Fig.28 At least one window 13 is provided in the radiator 10. The window 13 is used to make the facing area between the radiator 10 and the conductor 600 facing the radiator 10 a preset area. The preset area and the preset spacing between the radiator 10 and the conductor 600 make the capacitance between the radiator 10 and the conductor 600 a preset equivalent capacitance. The preset equivalent capacitance makes the first resonant current I1 and the second resonant current I2 form circularly polarized waves.

[0172] The window 13 of the radiator 10 provided in the embodiment of the present application can be located directly above other camera conductive shells 720 that are not used to form the capacitor structure 20, so as to avoid other camera modules 700 from interfering with the circularly polarized radiator 10 antenna designed in the present application; it can also be located directly above the camera conductive shell 720 used to form the capacitor structure 20, so as to adjust the facing area between the camera conductive shell 720 and the camera decorative part 410, and then adjust the equivalent capacitance value of the capacitor structure 20.

[0173] The present application does not make any specific limitation on the preset area. Optionally, the preset area is greater than 0.05×0.05λ 2 , where λ is the wavelength of the target frequency band. When the facing area between the camera conductive housing 720 and the camera decorative element 410 is less than 0.05×0.05λ 2, which may cause the equivalent capacitance to be too small, and the current perturbation effect on the radiator 10 is too small, so that a circularly polarized wave cannot be formed; the present application does not make a specific limitation on the preset area, and optionally, the preset spacing is 0.02λ, where λ is the wavelength of the target frequency band. The spacing between the camera conductive housing 720 and the camera decorative part 410 is greater than 0.02λ, which may cause the spacing between the camera module 700 and the back cover 400 to be too large, resulting in a large thickness of the electronic device 1000, and at the same time causing the equivalent capacitance to be too small, and the current perturbation effect on the radiator 10 is too small, so that a circularly polarized wave cannot be formed.

[0174] The electronic device 1000 provided in the embodiment of the present application realizes circular polarization radiation of the mobile phone back cover 400, has high gain and low axial ratio characteristics, and almost no additional space is occupied by the mobile phone by conforming the antenna assembly 100 with the mobile phone rear camera module and the camera decorative part 410. The antenna assembly 100 can be effectively applied to the communication between the mobile phone and the satellite, and the mobile phone can greatly improve the quality of satellite communication through the circular polarization wave transmission method.

[0175] See also Fig.29 , Fig.29 yes Fig.23 The directional diagram of the electronic device 1000 when answering a satellite phone call is shown. As can be seen from the figure, when a person's head is close to the mobile phone antenna, the quality of the satellite phone signal will be seriously affected. The radiator 10 of the antenna assembly 100 provided by the present application is located on the back cover 400, and its radiation direction is the side away from the display screen, that is, the radiation direction of the circularly polarized antenna using the radiator 10 is opposite to the direction of the person's head, which can effectively avoid the problem of human body blocking.

[0176] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. An antenna assembly, characterized in that: include: A radiator, wherein the outer edge of the radiator is symmetrical about a first center line, the radiator comprises a feeding portion and a tuning portion arranged at intervals, the feeding portion is located on the first center line of the radiator, the feeding portion is arranged at intervals from a midpoint of the first center line, and the tuning portion is arranged at intervals from the first center line; A capacitor structure, one end of which is electrically connected to the tuning unit and the other end of which is grounded; and A signal source, the signal source is electrically connected to the feeding part, and is used to excite the radiator to form a target resonance mode supporting a target frequency band, the target resonance mode causes the radiator to form a first resonance current in a first phase along an outer edge, and the target resonance mode causes the radiator to form a second resonance current in a second phase along an outer edge, and the angle between the direction of the first resonance current and the direction of the second resonance current is a preset angle to form a circularly polarized wave.

2. The antenna assembly according to claim 1, wherein: The intersection points of the first center line and the outer edge of the radiator are respectively the first target point and the second target point; the equivalent electrical length from the first target point to the second target point corresponds to 1 / 2 wavelength of the target frequency band.

3. The antenna assembly according to claim 2, wherein: The first center line divides the outer edge of the radiator into a first side edge and a second side edge; The first resonant current includes a first sub-current distributed along the first side and a second sub-current distributed along the second side, and the first sub-current and the second sub-current are asymmetric about the first center line; The second resonant current includes a third sub-current distributed along the first side and a fourth sub-current distributed along the second side, and the third sub-current and the fourth sub-current are asymmetric about the first center line.

4. The antenna assembly according to claim 3, characterized in that The radiator also has a second center line, which is perpendicular to the first center line, and intersects with the first center line at the midpoint of the first center line. The second center line and the first center line divide the radiator into a first quadrant, a second quadrant, a third quadrant and a fourth quadrant. The first quadrant and the second quadrant are formed by the first side and the first center line, and the distance between the first quadrant and the feeding part is smaller than the distance between the second quadrant and the feeding part; the third quadrant and the fourth quadrant are formed by the second side and the first center line, and the distance between the third quadrant and the feeding part is smaller than the distance between the fourth quadrant and the feeding part; the tuning part is located in at least one of the first quadrant, the second quadrant, the third quadrant and the fourth quadrant.

5. The antenna assembly according to claim 4, characterized in that The feeding portion is located at the first target point or between the first target point and a midpoint of the first center line.

6. The antenna assembly according to claim 5, characterized in that The tuning section is located in the first quadrant, and the capacitor structure is used to make the phase of the first sub-current greater than the phase of the second sub-current, and to make the phase of the third sub-current greater than the phase of the fourth sub-current.

7. The antenna assembly according to claim 6, wherein: In the first phase, the distance between the strong current area of ​​the first sub-current and the second target point is smaller than the distance between the strong current area of ​​the first sub-current and the first target point, and the strong current direction of the first sub-current is the direction pointing to the second target point; the strong current of the second sub-current is distributed at the position where the second center line intersects the second side, and the strong current direction of the second sub-current is the direction pointing to the second target point; the main direction of the first resonant current is the direction from the first target point to the second target point; In the second phase, the first part of the strong current of the third sub-current is distributed in the area of ​​the first side close to the first target point, and the direction of the first part of the strong current of the third sub-current is toward the first target point; the second part of the strong current of the third sub-current is distributed in the area of ​​the first side close to the second target point, and flows toward the second target point; the strong current of the fourth sub-current is distributed in the area of ​​the second side close to the second target point, and the direction of the strong current of the fourth sub-current is away from the second target point, the main direction of the second resonant current is along the second center line and from the first side to the second side, and the first resonant current and the second resonant current form a right-handed circularly polarized wave.

8. The antenna assembly according to claim 5, wherein: The tuning section is located in the second quadrant, and the capacitor structure is used to make the phase of the first sub-current smaller than the phase of the second sub-current, and to make the phase of the third sub-current smaller than the phase of the fourth sub-current.

9. The antenna assembly according to claim 8, wherein: In the first phase, the distance between the strong current area of ​​the first sub-current and the first target point is smaller than the distance between the strong current area of ​​the first sub-current and the second target point, and the strong current direction of the first sub-current is the direction pointing to the second target point; the strong current of the second sub-current is distributed at the position where the second center line intersects the second side, and the strong current direction of the second sub-current is the direction pointing to the second target point; the main direction of the first resonant current is the direction from the first target point to the second target point; In the second phase, the first part of the strong current of the third sub-current is distributed in the area of ​​the second side close to the second target point, and the direction of the first part of the strong current of the third sub-current is away from the second target point; the second part of the strong current of the third sub-current is distributed in the area of ​​the first side close to the first target point, and away from the first target point; the strong current of the fourth sub-current is distributed in the area of ​​the second side close to the second target point, and the direction of the strong current of the fourth sub-current is toward the second target point, the main direction of the second resonant current is along the second center line and from the second side to the first side, and the first resonant current and the second resonant current form a left-handed circularly polarized wave.

10. The antenna assembly according to claim 5, characterized in that The tuning section is located in the third quadrant, and the capacitor structure is used to make the phase of the second sub-current greater than the phase of the first sub-current, and to make the phase of the fourth sub-current greater than the phase of the third sub-current.

11. The antenna assembly according to claim 10, wherein: In the first phase, the distance between the strong current area of ​​the second sub-current and the second target point is smaller than the distance between the strong current area of ​​the second sub-current and the first target point, and the strong current direction of the second sub-current is the direction pointing to the second target point; the strong current of the first sub-current is distributed at the position where the second center line intersects the second side, and the strong current direction of the first sub-current is the direction pointing to the second target point; the main direction of the first resonant current is the direction from the first target point to the second target point; In the second phase, the first part of the strong current of the fourth sub-current is distributed in the area of ​​the second side close to the first target point, and the direction of the first part of the strong current of the fourth sub-current is toward the first target point; the second part of the strong current of the fourth sub-current is distributed in the area of ​​the second side close to the second target point, and flows toward the second target point; the strong current of the third sub-current is distributed in the area of ​​the first side close to the second target point, and the direction of the strong current of the third sub-current is away from the second target point, the main direction of the second resonant current is along the second center line and from the second side to the first side, and the first resonant current and the second resonant current form a left-handed circularly polarized wave.

12. The antenna assembly according to claim 5, wherein: The tuning section is located in the fourth quadrant, and the capacitor structure is used to make the phase of the second sub-current smaller than the phase of the first sub-current, and to make the phase of the fourth sub-current smaller than the phase of the third sub-current.

13. The antenna assembly according to claim 12, wherein: In the first phase, the distance between the strong current area of ​​the second sub-current and the first target point is smaller than the distance between the strong current area of ​​the second sub-current and the second target point, and the strong current direction of the second sub-current is a direction away from the first target point; the strong current of the first sub-current is distributed at the position where the second center line intersects the second side, and the strong current direction of the first sub-current is a direction pointing to the second target point; the main direction of the first resonant current is a direction from the first target point to the second target point; In the second phase, the first part of the strong current of the fourth sub-current is distributed in the area of ​​the second side close to the second target point, and the direction of the first part of the strong current of the fourth sub-current is toward the first target point; the second part of the strong current of the fourth sub-current is distributed in the area of ​​the second side close to the first target point, and flows toward the second target point; the strong current of the third sub-current is distributed in the area of ​​the first side close to the second target point, and the direction of the strong current of the third sub-current is toward the second target point, the main direction of the second resonant current is along the second center line and from the first side to the second side, and the first resonant current and the second resonant current form a right-handed circularly polarized wave.

14. An electronic device, characterized in that: It includes a back cover, a conductor and the antenna assembly as described in any one of claims 1-13, the radiator is arranged on the back cover, the part of the radiator that is relatively spaced less than a preset distance from the conductor is the tuning part, the conductor is grounded, and the capacitor structure is formed between the tuning part and the conductor.

15. The electronic device according to claim 14, characterized in that: The electronic device further comprises a camera module and a camera decoration, wherein the camera module comprises a camera and a camera conductive shell arranged around the camera, and the camera conductive shell is grounded; The camera decoration is embedded in the through hole of the back cover, or the camera decoration is attached to the back cover, the camera decoration has a light-transmitting portion for transmitting light to the camera, and at least a portion of the camera decoration is arranged opposite to the conductive housing of the camera; Part or all of the camera conductive housing and the camera decorative piece correspondingly arranged are the conductor, and the camera decorative piece is the radiator.

16. The electronic device according to claim 14 or 15, characterized in that: At least one window is provided in the radiator, and the window is used to make the facing area between the radiator and the conductor facing the radiator a preset area. The preset area and the preset distance between the radiator and the conductor make the capacitance between the radiator and the conductor a preset equivalent capacitance. The preset equivalent capacitance makes the first resonant current and the second resonant current form circularly polarized waves.

17. The electronic device according to claim 16, characterized in that: The preset spacing is 0.02λ, and the preset area is greater than 0.05×0.05λ 2 , where λ is the wavelength of the target frequency band.

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