Circularly polarized antenna and communication device

Abstract

The utility model discloses a circularly polarized antenna and a communication device, the circularly polarized antenna comprises a first dielectric layer, a second dielectric layer and a third dielectric layer which are stacked, a second metal layer is arranged between the first dielectric layer and the second dielectric layer, a first metal layer is arranged on the surface, deviating from the second dielectric layer, of the first dielectric layer, and a second metal layer is arranged on the surface, deviating from the third dielectric layer, of the third dielectric layer. The second dielectric layer and the third dielectric layer are provided with a third metal layer, and the surface, deviating from the third metal layer, of the third dielectric layer is provided with a fourth metal layer. And the second metal layer comprises a power division phase shift network. Through the design of the power division phase shift network and the arrangement of each dielectric layer and each metal layer, the circularly polarized antenna can present the characteristic of axial ratio bandwidth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a circularly polarized antenna and a communication device. BACKGROUND

[0002] Due to the small size, light weight, easy manufacturing and effective improvement of multipath distortion and polarization mismatch of the circularly polarized antenna, it has attracted extensive attention and in-depth research of scholars and engineers in the industry. However, the circularly polarized antennas reported at present often have the problem of narrow axial ratio bandwidth, which makes it difficult to realize high-speed transmission of signals and limits its use in satellite communication, aerospace, global positioning system and radar system. SUMMARY

[0003] The present application aims to provide a circularly polarized antenna to solve the technical problem of narrow axial ratio bandwidth of the circularly polarized antenna.

[0004] In a first aspect, the present application provides a circularly polarized antenna, which comprises a first dielectric layer, a second dielectric layer and a third dielectric layer arranged in layers, a second metal layer is arranged between the first dielectric layer and the second dielectric layer, a first metal layer is arranged on the surface of the first dielectric layer away from the second dielectric layer, a third metal layer is arranged on the second dielectric layer and the third dielectric layer, and a fourth metal layer is arranged on the surface of the third dielectric layer away from the third metal layer. The second metal layer comprises a power division and phase shift network, the power division and phase shift network comprises a first part, a second part, a third part and a fourth part connected in turn, and the first part, the second part, the third part and the fourth part jointly enclose a first rectangular space. One end of the first part is connected with a first stub, and the other end is connected with a fourth stub. One end of the third part is connected with a second stub, and the other end is connected with a third stub. The first stub, the second stub, the third stub and the fourth stub are all located in the first rectangular space. The first stub is provided with a first channel, and the first channel penetrates the first dielectric layer. The second stub is provided with a second channel, and the second channel penetrates the first dielectric layer and is connected with the first metal layer. The third stub is provided with a third channel, and the third channel penetrates the second dielectric layer and is connected with the third metal layer. The fourth stub is provided with a fourth channel, and the fourth channel penetrates the second dielectric layer and the third dielectric layer and is connected with the fourth metal layer. The first stub and the second stub are symmetric about the center of the second metal layer, and the third stub and the fourth stub are symmetric about the center of the second metal layer.

[0005] The first metal layer can serve as a ground layer, the second metal layer is a power division phase shift network layer, and the third metal layer and the fourth metal layer can serve as radiation layers. The first metal layer, the second metal layer, the third metal layer, and the fourth metal layer can convert the traveling wave in the circuit into circularly polarized electromagnetic waves that can be transmitted in the air, and the first dielectric layer, the second dielectric layer, and the third dielectric layer can isolate and support the first metal layer, the second metal layer, the third metal layer, and the fourth metal layer. The first channel can transmit the traveling wave in the circuit into the power division phase shift network. The second channel, the third channel, and the fourth channel can all serve to transmit signals. In the above scheme, the structure of the first metal layer, the second metal layer, the third metal layer, and the fourth metal layer and the first dielectric layer, the second dielectric layer, and the third dielectric layer can make the axial ratio bandwidth of the circularly polarized antenna wideband, and enhance the ability of high-speed signal transmission.

[0006] In some embodiments, the first part is connected with a first wire body, and the first wire body extends in the first rectangular space towards the third part. The third part is connected with a second wire body and a third wire body, and the second wire body and the third wire body both extend in the first rectangular space towards the first part, and the second wire body and the third wire body are both arranged in parallel with the first wire body, and the second wire body and the third wire body are symmetrically arranged relative to the first wire body. The above structure constitutes the main body of the power division phase shift network, and through this structure, the energy at the port can be evenly divided into the third channel and the fourth channel.

[0007] Further, as viewed in the direction of the stack, the first wire body is provided with a first grounding hole, the second wire body is provided with a second grounding hole, and the third wire body is provided with a third grounding hole. The first grounding hole is arranged away from the first part, and the second grounding hole and the third grounding hole are both arranged away from the third part. The first grounding hole, the second grounding hole, and the third grounding hole penetrate the first dielectric layer and connect the first metal layer. By arranging the grounding holes, electromagnetic interference can be shielded, and external electromagnetic interference can be blocked outside the network layer. At the same time, the grounding holes also help to suppress the electromagnetic radiation generated by the parallel three-wire itself from interfering with other circuit parts.

[0008] In some embodiments, the first metal layer comprises a first pad and a first load resistance, a second load resistance, a third load resistance, and a fourth load resistance. The first load resistance, the second load resistance, the third load resistance, and the fourth load resistance are connected to and surround the first pad, as viewed in the direction of the layer stack. The second channel penetrates the first dielectric layer and is connected to the first pad. By providing load resistances, the power division phase shift network can be provided with the required resistance values, the power requirements of different branches can be met, power loss can be reduced, and phase error can be reduced, thereby improving signal transmission quality.

[0009] Further, the first metal layer further comprises a second pad connected to the first pad through the first load resistance, the second load resistance, the third load resistance, and the fourth load resistance. The second pad comprises a clearance area, and the first channel is arranged in the clearance area.

[0010] In some embodiments, the third metal layer comprises a first radiating patch, a second radiating patch, and a first coupling feed line, and the first radiating patch and the second radiating patch are symmetrically arranged about the first coupling feed line, as viewed in the direction of the layer stack. The third channel penetrates the second dielectric layer and is connected to the first coupling feed line. The first coupling feed line comprises a pad and a rectangular resonator. By providing the first radiating patch and the second radiating patch, a traveling wave signal can be converted into a circularly polarized electromagnetic wave that can be transmitted in air.

[0011] Further, the first radiating patch is provided with a first circular slot. The first circular slot can better transmit signals to the fourth metal layer through the fourth channel.

[0012] Further, the second radiating patch comprises a second circular slot, and the first circular slot and the second circular slot are symmetrically arranged about the first coupling feed line, as viewed in the direction of the layer stack. By providing the second circular slot, the physical structure of the first radiating patch and the second radiating patch can be symmetrical, the directivity and gain of the antenna can be improved, stray radiation in other directions can be reduced, and the radiation pattern can be optimized.

[0013] In some embodiments, the fourth metal layer comprises a third radiation patch, a fourth radiation patch, and a second coupling feed line. The third radiation patch and the fourth radiation patch are symmetrically arranged about the second coupling feed line in the stacking direction. The fourth channel penetrates the second dielectric layer and is connected to the second coupling feed line. The second coupling feed line comprises a pad and a rectangular resonator. By arranging the third radiation patch and the fourth radiation patch, a traveling wave signal can be converted into a circularly polarized electromagnetic wave that can be transmitted in air.

[0014] The circularly polarized antenna structure according to the above scheme can exhibit a wide axial ratio band, and can improve high-speed and effective transmission of signals.

[0015] In a second aspect, the present application also provides a communication device comprising the circularly polarized antenna according to any one of the embodiments of the first aspect.

[0016] Additional aspects and advantages of embodiments of the present application will be described in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] One or more embodiments are illustrated by way of example in the drawings and are described herein in connection with the embodiments. These examples are not intended to limit the scope of the embodiments to those examples but rather the scope of the embodiments is to be accorded the broadest scope of the appended claims along with equivalents thereof.

[0018] Figure 1 A side view of a circularly polarized antenna according to some embodiments of the present application;

[0019] Figure 2 A top view of a first metal layer according to some embodiments of the present application;

[0020] Figure 3 A top view of a first dielectric layer according to some embodiments of the present application;

[0021] Figure 4 A top view of a second metal layer according to some embodiments of the present application;

[0022] Figure 5 A top view of a second dielectric layer according to some embodiments of the present application;

[0023] Figure 6 A top view of a third metal layer according to some embodiments of the present application;

[0024] Figure 7 A top view of a fourth metal layer according to some embodiments of the present application;

[0025] Figure 8 A top view of a third dielectric layer according to some embodiments of the present application;

[0026] Figure 9 Fig. 6 is a standing wave ratio simulation result diagram for some embodiments of the present application;

[0027] Figure 10 Fig. 7 is an axial ratio simulation result diagram for some embodiments of the present application;

[0028] Figure 11 Fig. 8 is a maximum gain simulation result diagram for some embodiments of the present application;

[0029] Figure 12 Fig. 9 is an E-plane (electric field plane) radiation pattern for some embodiments of the present application;

[0030] Figure 13 Fig. 10 is an H-plane (magnetic field plane) radiation pattern for some embodiments of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 1, first metal layer; 11, first pad; 12, first load resistor; 13, second load resistor; 14, third load resistor; 15, fourth load resistor; 16, clearance area;

[0033] 2, first dielectric layer;

[0034] 3, second metal layer; 31, power division phase shift network; 32, first rectangular space; 33, first branch; 331, first channel; 34, second branch; 341, second channel; 35, third branch; 351, third channel; 36, fourth branch; 361, fourth channel; 37, first line body; 371, first grounding hole; 38, second line body; 381, second grounding hole; 39, third line body; 391, third grounding hole;

[0035] 4, second dielectric layer;

[0036] 5, third metal layer; 51, first radiation patch; 511, first circular slot; 52, second radiation patch; 521, second circular slot; 53, first coupling feed line;

[0037] 6, third dielectric layer;

[0038] 7, fourth metal layer; 71, third radiation patch; 711, third circular slot; 72, fourth radiation patch; 721, fourth circular slot; 73, second coupling feed line. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all embodiments of the present application.

[0040] Reference to“an embodiment” or“the embodiment” in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” or“in another embodiment” or“in some embodiments” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily referring to a common or identical embodiment, or to an embodiment that is every other embodiment combination.

[0041] In the description of the embodiments of the application, the technical terms“first”,“second”, etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, a specific order or primary and secondary relationship. In the description of the embodiments of the application, the meaning of“a plurality of” is two or more, unless otherwise explicitly and specifically limited.

[0042] The technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict.

[0043] In a first aspect, the application provides a circularly polarized antenna, please refer to Figure 1 and Figure 4The circularly polarized antenna comprises a first dielectric layer 2, a second dielectric layer 4 and a third dielectric layer 6 arranged in layers, a second metal layer 3 is arranged between the first dielectric layer 2 and the second dielectric layer 4, a first metal layer 1 is arranged on the surface of the first dielectric layer 2 away from the second dielectric layer 4, a third metal layer 5 is arranged on the second dielectric layer 4 and the third dielectric layer 6, and a fourth metal layer 7 is arranged on the surface of the third dielectric layer 6 away from the third metal layer 5. The second metal layer 3 comprises a power division and phase shift network 31, the power division and phase shift network 31 comprises a first part (not shown in the figure), a second part (not shown in the figure), a third part (not shown in the figure) and a fourth part (not shown in the figure) connected in sequence, and the first part, the second part, the third part and the fourth part jointly enclose a first rectangular space 32. One end of the first part is connected with a first branch 33, and the other end is connected with a fourth branch 36; one end of the third part is connected with a second branch 34, and the other end is connected with a third branch 35; the first branch 33, the second branch 34, the third branch 35 and the fourth branch 36 are all located in the first rectangular space 32. The first branch 33 is provided with a first channel 331, and the first channel 331 penetrates through the first dielectric layer 2. The second branch 34 is provided with a second channel 341, and the second channel 341 penetrates through the first dielectric layer 2, and the second channel 341 is connected with the first metal layer 1. The third branch 35 is provided with a third channel 351, and the third channel 351 penetrates through the second dielectric layer 4, and the third channel 351 is connected with the third metal layer 5. The fourth branch 36 is provided with a fourth channel 361, and the fourth channel 361 penetrates through the second dielectric layer 4 and the third dielectric layer 6, and the fourth channel 361 is connected with the fourth metal layer 7. The first branch 33 and the second branch 34 are symmetric about the center of the second metal layer 3, and the third branch 35 and the fourth branch 36 are symmetric about the center of the second metal layer 3.

[0044] Wherein, the above-mentioned metal layers can be copper foils attached to the dielectric layers, or silver layers plated on the dielectric layers. The first dielectric layer 2 and the third dielectric layer 6 are high-frequency boards with low dielectric loss, and the second dielectric layer 4 can be a high-frequency board with low dielectric constant, or a support made of PPO (polyphenyl ether) or other materials with low dielectric loss. The first metal layer 1 is a ground layer, the second metal layer 3 is a power division and phase shift network 31 layer, and the third metal layer 5 and the fourth metal layer 7 are radiation layers. The metal layers can convert the traveling wave in the circuit into circularly polarized electromagnetic waves that can be transmitted in the air, and the dielectric layers can isolate and support the metal layers. The first channel 331 can be connected to an SMA (microwave) or other frequency transmitting device to form a port and transmit the traveling wave in the circuit into the power division and phase shift network 31. The second channel 341, the third channel 351 and the fourth channel 361 can all play a role in transmitting signals.

[0045] The first metal layer 1 can be used as a ground layer, the second metal layer 3 is a power division phase shift network layer, and the third metal layer 5 and the fourth metal layer 7 can be used as radiation layers. The first metal layer 1, the second metal layer 3, the third metal layer 5 and the fourth metal layer 7 can convert the traveling wave in the circuit into circularly polarized electromagnetic waves that can be transmitted in the air, and the first dielectric layer 2, the second dielectric layer 4 and the third dielectric layer 6 can isolate and support the first metal layer 1, the second metal layer 3, the third metal layer 5 and the fourth metal layer 7. The first channel 331 can transmit the traveling wave in the circuit to the power division phase shift network. The second channel 341, the third channel 351 and the fourth channel 361 can all transmit signals. In the above scheme, the structure of the first metal layer 1, the second metal layer 3, the third metal layer 5 and the fourth metal layer 7 and the first dielectric layer 2, the second dielectric layer 4 and the third dielectric layer 6 can make the axial ratio bandwidth of the circularly polarized antenna wideband, and enhance the ability of high-speed signal transmission.

[0046] In some embodiments, referring to Figure 4 The first part is connected with a first line body 37, and the first line body 37 extends in the first rectangular space 32 towards the third part. The third part is connected with a second line body 38 and a third line body 39, and the second line body 38 and the third line body 39 both extend in the first rectangular space 32 towards the first part. The second line body 38 and the third line body 39 are both arranged in parallel with the first line body 37, and the second line body 38 and the third line body 39 are symmetrically arranged with respect to the first line body 37. The above structure group is the main body of the power division phase shift network 31, which is roughly a "day" shaped resonant body inclined by 45°. Through the structure, the energy at the port can be divided into the third channel 351 and the fourth channel 361, and the signal at the third channel 351 and the signal at the fourth channel 361 are 180° out of phase.

[0047] Further, viewed in the direction of the stack, the first line body 37 is provided with a first grounding hole 371, the second line body 38 is provided with a second grounding hole 381, and the third line body 39 is provided with a third grounding hole 391. The first grounding hole 371 is arranged away from the first part, and the second grounding hole 381 and the third grounding hole 391 are both arranged away from the third part. The first grounding hole 371, the second grounding hole 381, and the third grounding hole 391 penetrate the first dielectric layer 2 and connect the first metal layer 1. By arranging the grounding hole, electromagnetic waves can be shielded, and external electromagnetic interference can be blocked outside the network layer. For example, in a complex electronic device environment, there may be various high-frequency signal sources around, and these external interference signals may affect the signal quality transmitted in the parallel three-line. At the same time, the grounding hole is also helpful to suppress the electromagnetic radiation generated by the parallel three-line itself from interfering with other circuit parts. When the signal is transmitted in the parallel three-line, electromagnetic fields will be generated, and if not controlled, these electromagnetic fields may be coupled to nearby other circuit elements or lines, increasing the problem of crosstalk, etc.

[0048] In some embodiments, referring to Figure 2 , the first metal layer 1 includes a first pad 11 and first, second, third, and fourth load resistances 12, 13, 14, and 15. Viewed in the direction of the stack, the first, second, third, and fourth load resistances 12, 13, 14, and 15 are connected to and arranged around the first pad 11. The second channel 341 penetrates the first dielectric layer 2 and is connected to the first pad 11. By arranging the load resistance, the required resistance value can be provided for the power division and phase shift network 31, the power requirement of different branches can be met, the power loss can be reduced, at the same time, the phase error can be reduced, and the signal transmission quality can be improved. For example, the resistance values of the load resistances are all set to 200 ohms, and then the power division and phase shift network 31 can be provided with a load of 50 ohms.

[0049] Further, referring to Figure 2 , the first metal layer 1 further includes a second pad (not shown in the figure), which is connected to the first pad 11 through the first, second, third, and fourth load resistances 12, 13, 14, and 15. The second pad includes a clearance area 16, and the first channel 331 is arranged in the clearance area 16. The clearance area 16 can isolate the first channel 331 from other metal parts of the first metal layer 1, reducing the interference with the signal.

[0050] In some embodiments, referring to Figure 6The third metal layer 5 includes a first radiation patch 51, a second radiation patch 52, and a first coupling feed line 53. The first radiation patch 51 and the second radiation patch 52 are symmetrically arranged about the first coupling feed line 53 in the stacking direction. The third channel 351 penetrates the second dielectric layer 4 and is connected to the first coupling feed line 53. The first coupling feed line 53 includes a pad and a rectangular resonator. The first radiation patch 51 and the second radiation patch 52 can convert a traveling wave signal into a circularly polarized electromagnetic wave that can be transmitted in the air. The first coupling feed line 53 can provide the first radiation patch 51 and the second radiation patch 52 with a traveling wave signal with equal power and a phase difference of 180°, so that the electric field components generated by the two radiation patches can cooperate with each other, optimize the polarization ellipse shape of the synthesized electric field, and make the antenna radiate a circularly polarized wave, thereby improving the circular polarization purity of the antenna.

[0051] Further, referring to Figure 6 The first radiation patch 51 is provided with a first circular slot 511. The first circular slot 511 can better transmit a signal to the fourth metal layer 7 through the fourth channel 361.

[0052] Further, referring to Figure 6 The second radiation patch 52 includes a second circular slot 521. The first circular slot 511 and the second circular slot 521 are symmetrically arranged about the first coupling feed line 53 in the stacking direction. The second circular slot 521 can ensure that the physical structures of the first radiation patch 51 and the second radiation patch 52 are symmetrical, can improve the directivity and gain of the antenna, reduce stray radiation in other directions, and optimize the radiation pattern.

[0053] In some embodiments, referring to Figure 7 The fourth metal layer 7 includes a third radiation patch 71, a fourth radiation patch 72, and a second coupling feed line 73. The third radiation patch 71 and the fourth radiation patch 72 are symmetrically arranged about the second coupling feed line 73 in the stacking direction. The fourth channel 361 penetrates the second dielectric layer 4 and is connected to the second coupling feed line 73. The second coupling feed line 73 includes a pad and a rectangular resonator. The third radiation patch 71 and the fourth radiation patch 72 can convert a traveling wave signal into a circularly polarized electromagnetic wave that can be transmitted in the air. The second coupling feed line can provide the third radiation patch 71 and the fourth radiation patch 72 with a traveling wave signal with equal power and a phase difference of 180°, which can improve the axial ratio performance of the circularly polarized antenna, suppress cross polarization, and reduce energy loss.

[0054] In the embodiments of the present application, the circularly polarized antenna structure of the above-mentioned scheme can make the circularly polarized antenna exhibit a wide axial ratio band, and can improve the high-speed transmission efficiency of the signal.

[0055] The application also provides simulation results of some of the above embodiments, please refer to Figures 9 to 13 .

[0056] wherein, Figure 9 is the simulation result of the standing wave ratio. It can be known from Figure 9 that the bandwidth range of the standing wave ratio less than 2 is 8.7GHz to 18GHz, the center frequency is 13.35GHz, the passband bandwidth is 9.3GHz, and the relative bandwidth is 69.7%. It can be known from the simulation result that the impedance passband of the circularly polarized antenna has a wideband characteristic.

[0057] Figure 10 is the simulation result of the antenna axial ratio. It can be known from Figure 10 that the bandwidth range of the axial ratio less than 3 is 10.3GHz to 15.4GHz, the center frequency is 12.85GHz, the passband bandwidth is 5.1GHz, and the relative bandwidth is 39.7%. It can be known from the simulation result that the axial ratio passband of the circularly polarized antenna has a wideband characteristic.

[0058] Figure 11 is the simulation result of the maximum gain of the antenna. It can be known from Figure 11 that the average maximum gain of the axial ratio bandwidth of the first port of the circularly polarized antenna is 4.26dBi. It can be known from the simulation result that the circularly polarized antenna has a characteristic of high maximum gain.

[0059] Figure 12 and Figure 13 are the E-plane (electric field plane) and H-plane (magnetic field plane) radiation patterns of the right-handed circularly polarized antenna at 13.0GHz. It can be known from Figure 12 and Figure 13 that the front-back ratio and cross polarization are both high, and the right-handed circularly polarized antenna is excellent in performance.

[0060] In a second aspect, the application also provides a communication device comprising the circularly polarized antenna in any of the above embodiments.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; under the idea of the application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the application as described above, which are not provided in detail for the sake of simplicity; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A circularly polarized antenna, characterized in that, It includes a first dielectric layer, a second dielectric layer and a third dielectric layer stacked together. A second metal layer is disposed between the first dielectric layer and the second dielectric layer. A first metal layer is disposed on the surface of the first dielectric layer away from the second dielectric layer. A third metal layer is disposed between the second dielectric layer and the third dielectric layer. A fourth metal layer is disposed on the surface of the third dielectric layer away from the third metal layer. The second metal layer includes a power divider phase shifter network, which includes a first part, a second part, a third part, and a fourth part connected in sequence, and the first part, the second part, the third part, and the fourth part together enclose a first rectangular space; One end of the first part is connected to a first branch, and the other end is connected to a fourth branch; one end of the third part is connected to a second branch, and the other end is connected to a third branch; the first branch, the second branch, the third branch, and the fourth branch are all located in the first rectangular space; The first branch is provided with a first channel, which penetrates the first medium layer; The second branch is provided with a second channel, which penetrates the first dielectric layer and is connected to the first metal layer; The third branch is provided with a third channel, which penetrates the second dielectric layer and is connected to the third metal layer; The fourth branch is provided with a fourth channel, which penetrates the second dielectric layer and the third dielectric layer, and is connected to the fourth metal layer; The first branch and the second branch are symmetrical about the center of the second metal layer, and the third branch and the fourth branch are symmetrical about the center of the second metal layer.

2. The circularly polarized antenna according to claim 1, characterized in that, The first part is connected to a first line, which extends toward the third part within the first rectangular space; The third part is connected by a second line and a third line. Both the second line and the third line extend toward the first part within the first rectangular space. Both the second line and the third line are arranged parallel to the first line, and the second line and the third line are arranged symmetrically with respect to the first line.

3. The circularly polarized antenna according to claim 2, characterized in that, Viewed along the stacking direction, the first wire body is provided with a first grounding hole, the second wire body is provided with a second grounding hole, and the third wire body is provided with a third grounding hole; The first grounding hole is disposed away from the first part, and both the second grounding hole and the third grounding hole are disposed away from the third part; The first grounding hole, the second grounding hole, and the third grounding hole penetrate the first dielectric layer and are connected to the first metal layer.

4. The circularly polarized antenna according to claim 1, characterized in that, The first metal layer includes a first pad, a first load resistor, a second load resistor, a third load resistor, and a fourth load resistor; Viewed along the stacking direction, the first load resistor, the second load resistor, the third load resistor, and the fourth load resistor are all connected to the first pad and arranged around the first pad; The second channel penetrates the first dielectric layer and is connected to the first pad.

5. The circularly polarized antenna according to claim 4, characterized in that, The first metal layer further includes a second pad, which is connected to the first pad via the first load resistor, the second load resistor, the third load resistor, and the fourth load resistor. The second pad includes a clearance area, and the first channel is disposed in the clearance area.

6. The circularly polarized antenna according to claim 1, characterized in that, The third metal layer includes a first radiating patch, a second radiating patch, and a first coupling feed line. When viewed along the stacking direction, the first radiating patch and the second radiating patch are symmetrically arranged about the first coupling feed line. The third channel penetrates the second dielectric layer and is connected to the first coupling feed line.

7. The circularly polarized antenna according to claim 6, characterized in that, The first radiating patch has a first circular slit.

8. The circularly polarized antenna according to claim 7, characterized in that, The second radiating patch includes a second circular slit. When viewed along the stacking direction, the first circular slit and the second circular slit are symmetrically arranged about the first coupling feed line.

9. The circularly polarized antenna according to claim 1, characterized in that, The fourth metal layer includes a third radiating patch, a fourth radiating patch, and a second coupling feed line; Viewed along the stacking direction, the third radiating patch and the fourth radiating patch are symmetrically arranged about the second coupling feed line; The fourth channel penetrates the second dielectric layer and is connected to the second coupling feed line.

10. A communication device, characterized in that, Includes the circularly polarized antenna of any one of claims 1 to 9.

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