Millimeter wave antenna and communication device

Abstract

The millimeter wave antenna and the communication device provided in the application relate to the technical field of millimeter wave antennas.In the application, the millimeter wave antenna comprises a grid array antenna layer, a Fabry-Perot antenna feed layer and a microstrip feed layer, and the grid array antenna layer and the microstrip feed layer are respectively located on the opposite sides of the Fabry-Perot antenna feed layer; the Fabry-Perot antenna feed layer comprises a first metal probe and a second metal probe, the first metal probe and the second metal probe are respectively connected to one side of the grid array antenna layer close to the Fabry-Perot antenna feed layer, and the first metal probe and the second metal probe are respectively used as a differential feed structure and a probe feed structure of the grid array antenna layer to respectively excite resonances of a millimeter wave frequency band and a sub-6GHz frequency band.Based on the above, the problem that the sub-6GHz frequency band and the millimeter wave frequency band are difficult to effectively work together in the prior art can be improved.

Description

TECHNICAL FIELD

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

[0002] In recent years, based on the existing situation of urbanization process and population distribution density, the development of 5G / 6G integrated satellite Internet communication technology is listed as one of the top ten industrial technology problems. In future communication technology, sub-6GHz frequency band will still be used as the main spectrum resource in ground network, and the antenna performance will focus on important performance parameters such as wide bandwidth, high gain and dual linear polarization. On the basis of the existing ground network system, intelligent reflecting surface, skin base station and other communication equipment are used as auxiliary; satellite communication will also play an important role in the next generation mobile communication system. Satellite communication usually faces problems such as atmospheric attenuation, transmission / reception / cross-region isolation and Doppler effect. In view of the above challenges, the terminal layer antenna design method with wide bandwidth, high gain, uplink / downlink circular polarization and cross-region circular polarization performance is concerned. Therefore, it has great research significance to design an antenna that can work effectively in sub-6GHz and millimeter wave frequency bands. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a millimeter wave antenna and a communication device to improve the problem that sub-6GHz frequency band and millimeter wave frequency band cannot work effectively in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] A millimeter wave antenna, comprising a grid array antenna layer, a Fabry-Perot antenna feed layer and a microstrip feed layer, the grid array antenna layer and the microstrip feed layer are respectively located on the opposite sides of the Fabry-Perot antenna feed layer:

[0006] Wherein, the Fabry-Perot antenna feed layer comprises a first metal probe and a second metal probe, the first metal probe and the second metal probe are respectively connected to one side of the grid array antenna layer close to the Fabry-Perot antenna feed layer, and the first metal probe and the second metal probe are respectively used as the differential feed structure and the probe feed structure of the grid array antenna layer to respectively excite the resonance of the millimeter wave frequency band and the resonance of the sub-6GHz frequency band, so that the millimeter wave antenna is used for sub-6GHz frequency band and millimeter wave frequency band collaborative work.

[0007] In the preferred selection of the present application, in the above-mentioned millimeter wave antenna, the grid array antenna layer comprises:

[0008] a first dielectric substrate layer;

[0009] a grid array structure located on the first dielectric substrate layer close to the side of the Fabry-Perot antenna feed layer, wherein the first metal probe and the second metal probe are connected to the grid array structure, respectively;

[0010] a parasitic patch structure located on the first dielectric substrate layer away from the grid array structure, wherein the first dielectric substrate layer, the grid array structure and the parasitic patch structure serve as a partially reflective surface of the Fabry-Perot antenna feed layer.

[0011] In a preferred selection of the present application, in the above millimeter wave antenna, the line connecting the geometric center of the grid array structure and the geometric center of the parasitic patch structure is parallel to the normal line of the first dielectric substrate layer.

[0012] In a preferred selection of the present application, in the above millimeter wave antenna, the Fabry-Perot antenna feed layer further comprises:

[0013] a second dielectric substrate layer;

[0014] a ground plane layer located on the second dielectric substrate layer away from the grid array antenna layer, wherein the ground plane layer also serves as a ground plane layer of the microstrip feed layer, so that the ground plane layers of the Fabry-Perot antenna feed layer and the microstrip feed layer are shared.

[0015] In a preferred selection of the present application, in the above millimeter wave antenna, the microstrip feed layer comprises:

[0016] a third dielectric substrate layer, wherein the third dielectric substrate layer is located on the side of the ground plane layer away from the second dielectric substrate layer;

[0017] a first microstrip line, wherein the first microstrip line is located on the side of the third dielectric substrate layer away from the ground plane layer, and the first metal probe comprises two differential probes, which respectively extend from the grid array antenna layer, pass through the second dielectric substrate layer, the ground plane layer and the third dielectric substrate layer in turn, and extend to the first microstrip line to form a corresponding feed structure.

[0018] In a preferred selection of the present application, in the above millimeter wave antenna, the microstrip feed layer further comprises:

[0019] a second microstrip line, wherein the second microstrip line is located on the side of the third dielectric substrate layer away from the ground plane layer, and the second metal probe extends from the grid array antenna layer, passes through the second dielectric substrate layer, the ground plane layer and the third dielectric substrate layer in turn, and extends to the second microstrip line to form a corresponding feed structure.

[0020] In a preferred selection of the present application, in the above millimeter wave antenna, the Fabry-Perot antenna feed layer further comprises a first patch antenna structure, wherein the first patch antenna structure is located on the side of the second dielectric substrate layer close to the grid array antenna layer;

[0021] The microstrip feed layer further comprises a third microstrip line, wherein the third microstrip line is located on the side of the third dielectric substrate layer away from the ground plane layer, and the first patch antenna structure extends to the third microstrip line through the third metal probe sequentially penetrating the second dielectric substrate layer, the ground plane layer and the third dielectric substrate layer, forming a corresponding feed structure.

[0022] In a preferred selection of the present application, in the above millimeter wave antenna, the Fabry-Perot antenna feed layer further comprises a second patch antenna structure and a metalized via, wherein the second patch antenna structure is located on the side of the second dielectric substrate layer close to the grid array antenna layer, and is distributed between two differential probes included by the first metal probe, and one end of the metalized via is connected with the second patch antenna structure and the other end extends to the side of the second dielectric substrate layer close to the ground plane layer, and a corresponding slot structure is formed on the ground plane layer at a corresponding position;

[0023] The microstrip feed layer further comprises a fourth microstrip line, wherein the fourth microstrip line is located on the side of the third dielectric substrate layer away from the ground plane layer, and the second patch antenna structure forms a slot-coupled feed structure of the fourth microstrip line through the metalized via and the slot structure.

[0024] In a preferred selection of the present application, in the above millimeter wave antenna, the line between the geometric center of the second patch antenna structure and the geometric center of the grid array structure included by the grid array antenna layer is parallel to the normal line of the second dielectric substrate layer.

[0025] On the basis of the above, the present application further provides a communication device, comprising:

[0026] The above millimeter wave antenna;

[0027] A radio frequency signal processing device, wherein the radio frequency signal processing device is connected with the millimeter wave antenna, and is used for receiving and processing the radio frequency signal received by the millimeter wave antenna or transmitting and outputting the radio frequency signal to be transmitted through the millimeter wave antenna.

[0028] For the millimeter wave antenna and the communication device provided in the present application, the millimeter wave antenna comprises a grid array antenna layer, a Fabry-Perot antenna feed layer and a microstrip feed layer, the grid array antenna layer and the microstrip feed layer are respectively located on the opposite sides of the Fabry-Perot antenna feed layer: the Fabry-Perot antenna feed layer comprises a first metal probe and a second metal probe, the first metal probe and the second metal probe are respectively connected to one side of the grid array antenna layer close to the Fabry-Perot antenna feed layer, and the first metal probe and the second metal probe are respectively used as a differential feed structure and a probe feed structure of the grid array antenna layer to respectively excite resonances of the millimeter wave frequency band and the sub-6GHz frequency band. Based on the above, since the resonances of the millimeter wave frequency band and the sub-6GHz frequency band can be respectively excited by the differential feed structure and the probe feed structure, the millimeter wave antenna can work in cooperation with the sub-6GHz frequency band and the millimeter wave frequency band, and thus the problem that the sub-6GHz frequency band and the millimeter wave frequency band are difficult to effectively work in cooperation in the prior art can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows.

[0030] Figure 1 The structure schematic diagram of the millimeter wave antenna provided in the embodiments of the present application.

[0031] Figure 2 The top view of the grid array antenna layer provided in the embodiments of the present application.

[0032] Figure 3 The bottom view of the grid array antenna layer provided in the embodiments of the present application.

[0033] Figure 4 The top view of the Fabry-Perot antenna feed layer provided in the embodiments of the present application.

[0034] Figure 5 The bottom view of the microstrip feed layer provided in the embodiments of the present application.

[0035] Figure 6 The simulation curve diagram of the -10dB impedance bandwidth and the gain change with frequency of the millimeter wave antenna provided in the embodiments of the present application under the 2.26GHz-2.36GHz frequency band.

[0036] Figure 7 The simulation curve diagram of the -10dB impedance bandwidth and the gain change with frequency of the millimeter wave antenna provided in the embodiments of the present application under the 11.3GHz-11.5GHz frequency band.

[0037] Figure 8The simulation curve diagram of the -10dB impedance bandwidth and the gain change with frequency of the millimeter wave antenna provided by the embodiment of the present application under the frequency band of 25.8GHz-27.7GHz.

[0038] Figure 9 The simulation curve diagram of the -10dB impedance bandwidth and the gain change with frequency of the millimeter wave antenna provided by the embodiment of the present application under the frequency band of 38.1GHz-41.8GHz.

[0039] Figure 10 The simulation radiation pattern of the millimeter wave antenna provided by the embodiment of the present application under the frequency of 2.3GHz.

[0040] Figure 11 The simulation radiation pattern of the millimeter wave antenna provided by the embodiment of the present application under the frequency of 11.4GHz.

[0041] Icon: 1-first dielectric substrate layer; 2-parasitic patch structure; 3-lattice array structure; 4-first metal probe; 5-second metal probe; 6-second dielectric substrate layer; 7-first patch antenna structure; 8-second patch antenna structure; 9-third dielectric substrate layer; 10-bottom plate layer; 11-fourth via hole; 12-first via hole; 13-second via hole; 14-third via hole; 15-slit structure; 16-third microstrip line; 17-first microstrip line; 18-second microstrip line; 19-quarter wavelength impedance transformer; 20-fourth microstrip line; 21-third metal probe; 22-metalized via hole. DETAILED DESCRIPTION

[0042] 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 and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0044] As Figures 1-5As shown, the embodiment of the present application provides a millimeter wave antenna. Wherein the millimeter wave antenna can include a grid array antenna layer, a Fabry-Perot antenna feed layer and a microstrip feed layer, the grid array antenna layer and the microstrip feed layer are respectively located on the opposite sides of the Fabry-Perot antenna feed layer, for example, in Figure 1 from top to bottom, the grid array antenna layer, the Fabry-Perot antenna feed layer and the microstrip feed layer are arranged in sequence.

[0045] In detail, the Fabry-Perot antenna feed layer can include a first metal probe 4 and a second metal probe 5. Wherein the first metal probe 4 and the second metal probe 5 are respectively connected to the side of the grid array antenna layer close to the Fabry-Perot antenna feed layer, and the first metal probe 4 and the second metal probe 5 are respectively used as the differential feed structure and the probe feed structure of the grid array antenna layer to respectively excite the resonance of the millimeter wave frequency band and the resonance of the sub-6GHz frequency band, so that the millimeter wave antenna is used for sub-6GHz frequency band and millimeter wave frequency band collaborative work. Specifically, the first metal probe 4 can be used as the differential feed structure of the grid array antenna layer to excite the resonance of the millimeter wave frequency band. The second metal probe 5 can be used as the probe feed structure of the grid array antenna layer to excite the resonance of the sub-6GHz frequency band. That is, two resonance modes can be used to introduce sub-6GHz into the working frequency band of the antenna.

[0046] Based on the above, since the resonance of the millimeter wave frequency band and the resonance of the sub-6GHz frequency band can be respectively excited by the differential feed structure and the probe feed structure, so that the millimeter wave antenna can work in the sub-6GHz frequency band and the millimeter wave frequency band, the problem that the sub-6GHz frequency band and the millimeter wave frequency band are difficult to effectively work together in the prior art can be improved.

[0047] In the first aspect, for the grid array antenna layer, it needs to be explained that the specific structure of the grid array antenna layer is not limited and can be selected according to actual needs.

[0048] For example, in an alternative embodiment, in order to provide high reflection coefficient and low phase gradient in two frequency bands, realize structure multiplexing in the millimeter wave antenna, the grid array antenna layer can include a first dielectric substrate layer 1, a parasitic patch structure 2 and a grid array structure 3.

[0049] In detail, the grid array structure 3 can be located on the first dielectric substrate layer 1 close to the side of the Fabry-Perot antenna feed layer, so that the first metal probe 4 and the second metal probe 5 can be connected to the grid array structure 3, respectively. In addition, the parasitic patch structure 2 can be located on the first dielectric substrate layer 1 away from the grid array structure 3. In this way, the first dielectric substrate layer 1, the grid array structure 3 and the parasitic patch structure 2 serve as part of the reflective surface of the Fabry-Perot antenna feed layer, and the parasitic patch structure 2 is used to provide high reflection coefficient and low phase gradient in the millimeter wave frequency band and the sub-6GHz frequency band.

[0050] It can be understood that the relative distribution position between the grid array structure 3 and the parasitic patch structure 2 in the grid array antenna layer is not limited, for example, in an alternative embodiment, in order to make the formed reflective surface have better reflection effect, the line connecting the geometric center of the grid array structure 3 and the geometric center of the parasitic patch structure 2 can be parallel to the normal line of the first dielectric substrate layer 1.

[0051] In addition, it should be noted that the grid array structure 3 and the parasitic patch structure 2 can be printed on the opposite sides (or two sides) of the first dielectric substrate layer 1, respectively.

[0052] Secondly, for the Fabry-Perot antenna feed layer, it should be noted that the specific structure of the Fabry-Perot antenna feed layer is not limited and can be selected according to actual needs.

[0053] For example, in an alternative embodiment, in order to reduce the complexity of the structure, the Fabry-Perot antenna feed layer can include a second dielectric substrate layer 6 and a ground layer 10.

[0054] In detail, the ground layer can be located on the second dielectric substrate layer 6 away from the grid array antenna layer. In which, the ground layer also serves as the ground layer of the microstrip feed layer, so that the ground layer of the Fabry-Perot antenna feed layer and the microstrip feed layer is shared.

[0055] In addition, it should be noted that the first dielectric substrate layer 1 and the second dielectric substrate layer 6 have a certain distance, so that a certain cavity can be formed, thereby realizing the resonance of electromagnetic waves.

[0056] Thirdly, for the microstrip feed layer, it should be noted that the specific structure of the microstrip feed layer is not limited and can be selected according to actual needs.

[0057] For example, in an alternative embodiment, the microstrip feed layer can include a third dielectric substrate layer 9 and a microstrip line. In detail, the third dielectric substrate layer 9 can be located on a side of the ground plane layer distal to the second dielectric substrate layer 6. The microstrip line can be located on a side of the third dielectric substrate layer 9 distal to the ground plane layer.

[0058] It can be appreciated that the specific configuration and distribution of the microstrip line is not limited.

[0059] For example, in an alternative embodiment, the microstrip feed layer can include a first microstrip line 17. In detail, the first microstrip line 17 can be located on a side of the third dielectric substrate layer 9 distal to the ground plane layer, and the first metal probe 4 can include two differential probes that extend from the grid array antenna layer, through the second dielectric substrate layer 6, the ground plane layer, and the third dielectric substrate layer 9, to the first microstrip line 17, respectively, to form a corresponding feed structure. For example, the two differential probes can extend to the first microstrip line 17 through the first via 12 and the second via 13, respectively. That is, the first microstrip line 17 can serve as a microstrip line structure for differential microstrip to coaxial differential feed of the grid array structure 3 included in the grid array antenna layer.

[0060] In addition, the microstrip feed layer can further include a quarter wavelength impedance transformer 19 connected to the first microstrip line 17. In this way, the first microstrip line 17 and the quarter wavelength impedance transformer 19 together serve as a microstrip line structure for differential microstrip to coaxial differential feed of the grid array structure 3 included in the grid array antenna layer.

[0061] For another example, in another alternative embodiment, the microstrip feed layer can further include a second microstrip line 18. In detail, the second microstrip line 18 can be located on a side of the third dielectric substrate layer 9 distal to the ground plane layer, and the second metal probe 5 can extend from the grid array antenna layer, through the second dielectric substrate layer 6, the ground plane layer, and the third dielectric substrate layer 9, to the second microstrip line 18, to form a corresponding feed structure. For example, the second metal probe 5 can extend to the second microstrip line 18 through the third via 14. That is, the second microstrip line 18 can serve as a microstrip line structure for microstrip to coaxial feed of the grid array structure 3 included in the grid array antenna layer.

[0062] For another example, in a third alternative implementation, the Fabry-Perot antenna feed layer can further include a first patch antenna structure 7, wherein the first patch antenna structure 7 is located on the side of the second dielectric substrate layer 6 close to the grid array antenna layer. Based on this, the microstrip feed layer can further include a third microstrip line 16. In detail, the third microstrip line 16 is located on the side of the third dielectric substrate layer 9 away from the ground plane layer, and the first patch antenna structure 7 extends to the third microstrip line 16 through a third metal probe 21 sequentially penetrating through the second dielectric substrate layer 6, the ground plane layer and the third dielectric substrate layer 9, to form a corresponding feed structure. For example, the third metal probe 21 can extend to the third microstrip line 16 through a fourth via hole 11 sequentially penetrating through the second dielectric substrate layer 6, the ground plane layer and the third dielectric substrate layer 9. That is, the third microstrip line 16 can serve as a microstrip line structure for microstrip-to-coaxial feed of the first patch antenna structure 7.

[0063] For another example, in a fourth alternative implementation, the Fabry-Perot antenna feed layer can further include a second patch antenna structure 8 and a metallized via hole 22, wherein the second patch antenna structure 8 is located on the side of the second dielectric substrate layer 6 close to the grid array antenna layer, and is distributed between two differential probes included by the first metal probe 4, and one end of the metallized via hole 22 is connected with the second patch antenna structure 8 and the other end extends to the side of the second dielectric substrate layer 6 close to the ground plane layer, and a corresponding slot structure 15, such as a rectangular slot, is formed on the ground plane layer at a corresponding position. Based on this, the microstrip feed layer can further include a fourth microstrip line 20. In detail, the fourth microstrip line 20 is located on the side of the third dielectric substrate layer 9 away from the ground plane layer, and the second patch antenna structure 8 forms a slot-coupled feed structure of the fourth microstrip line 20 through the metallized via hole 22 and the slot structure 15. That is, the fourth microstrip line 20 can serve as a microstrip line structure for microstrip-to-slot feed of the second patch antenna structure 8.

[0064] In addition, it should be noted that the line between the geometric center of the second patch antenna structure 8 and the geometric center of the grid array structure 3 included by the grid array antenna layer can be parallel to the normal line of the second dielectric substrate layer 6.

[0065] In addition, it should be noted that the first patch antenna structure 7 and the second patch antenna structure 8 can respectively serve as 11.5GHz and 26GHz feed sources of the Fabry-Perot cavity feed layer.

[0066] In addition, it should be noted that the first microstrip line 17, the second microstrip line 18, the third microstrip line 16 and the fourth microstrip line 20 can have an impedance of 50Ω, and can be fed by an SMA connector.

[0067] In addition, as shown in FIG. 6, in the embodiment of the present application, based on the -10dB impedance bandwidth and the simulation curve of the gain varying with the frequency of the millimeter wave antenna under the frequency band of 2.26GHz-2.36GHz, it can be known that the relative center bandwidth of the millimeter wave antenna is 4.3%. Figure 6

[0068] In addition, as shown in FIG. 6, in the embodiment of the present application, based on the -10dB impedance bandwidth and the simulation curve of the gain varying with the frequency of the millimeter wave antenna under the frequency band of 2.26GHz-2.36GHz, it can be known that the relative center bandwidth of the millimeter wave antenna is 4.3%. Figure 7

[0069] In addition, as shown in FIG. 6, in the embodiment of the present application, based on the -10dB impedance bandwidth and the simulation curve of the gain varying with the frequency of the millimeter wave antenna under the frequency band of 2.26GHz-2.36GHz, it can be known that the relative center bandwidth of the millimeter wave antenna is 4.3%. Figure 8

[0070] In addition, as shown in FIG. 6, in the embodiment of the present application, based on the -10dB impedance bandwidth and the simulation curve of the gain varying with the frequency of the millimeter wave antenna under the frequency band of 2.26GHz-2.36GHz, it can be known that the relative center bandwidth of the millimeter wave antenna is 4.3%. Figure 9

[0071] In addition, as shown in FIG. 6, in the embodiment of the present application, based on the -10dB impedance bandwidth and the simulation curve of the gain varying with the frequency of the millimeter wave antenna under the frequency band of 2.26GHz-2.36GHz, it can be known that the relative center bandwidth of the millimeter wave antenna is 4.3%. Figure 10

[0072] In addition, as shown in FIG. 6, in the embodiment of the present application, based on the -10dB impedance bandwidth and the simulation curve of the gain varying with the frequency of the millimeter wave antenna under the frequency band of 2.26GHz-2.36GHz, it can be known that the relative center bandwidth of the millimeter wave antenna is 4.3%. Figure 11

[0073] The embodiment of the present application also provides a communication device, wherein the communication device can include a radio frequency signal processing device and the above-mentioned millimeter wave antenna. In detail, the radio frequency signal processing device is connected with the millimeter wave antenna, and is used for receiving and processing the radio frequency signal received by the millimeter wave antenna or transmitting and outputting the radio frequency signal to be transmitted through the millimeter wave antenna.

[0074] ​​​​​​In summary, the millimeter wave antenna and the communication device provided by the application, the millimeter wave antenna comprises a grid array antenna layer, a Fabry-Perot antenna feed layer and a microstrip feed layer, the grid array antenna layer and the microstrip feed layer are respectively located on the opposite sides of the Fabry-Perot antenna feed layer: the Fabry-Perot antenna feed layer comprises a first metal probe 4 and a second metal probe 5, the first metal probe 4 and the second metal probe 5 are respectively connected to the side of the grid array antenna layer close to the Fabry-Perot antenna feed layer, and the first metal probe 4 and the second metal probe 5 are respectively used as the differential feed structure and the probe feed structure of the grid array antenna layer to respectively excite the resonance of the millimeter wave frequency band and the resonance of the sub-6GHz frequency band. Based on the above, since the resonance of the millimeter wave frequency band and the resonance of the sub-6GHz frequency band can be respectively excited by the differential feed structure and the probe feed structure, the millimeter wave antenna can work in cooperation in the sub-6GHz frequency band and the millimeter wave frequency band, and therefore the problem that the sub-6GHz frequency band and the millimeter wave frequency band are difficult to effectively work in cooperation in the prior art can be improved.

[0075] The above only describes the preferred embodiments of the application and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A millimeter-wave antenna, characterized in that, It includes a grid array antenna layer, a Fabry-Perot antenna feed layer, and a microstrip feed layer, wherein the grid array antenna layer and the microstrip feed layer are located on opposite sides of the Fabry-Perot antenna feed layer. The Fabry-Perot antenna feed layer includes a first metal probe and a second metal probe. The first metal probe and the second metal probe are respectively connected to the side of the grid array antenna layer near the Fabry-Perot antenna feed layer. The first metal probe and the second metal probe serve as the differential feed structure and the probe feed structure of the grid array antenna layer, respectively, to excite the resonance of the millimeter-wave band and the sub-6GHz band, so that the millimeter-wave antenna can be used for the sub-6GHz band and the millimeter-wave band to work together. The grid array antenna layer includes: First dielectric substrate layer; A grid array structure located on the side of the first dielectric substrate layer near the Fabry-Perot antenna feed layer, wherein the first metal probe and the second metal probe are respectively connected to the grid array structure; A parasitic patch structure located on the side of the first dielectric substrate layer away from the grid array structure, wherein the first dielectric substrate layer, the grid array structure, and the parasitic patch structure serve as part of the reflective surface of the Fabry-Perot antenna feed layer; The Fabry-Perot antenna feed layer further includes: Second dielectric substrate layer; A ground plane located on the side of the second dielectric substrate layer away from the grid array antenna layer, wherein the ground plane also serves as the ground plane of the microstrip feed layer, so that the ground plane of the Fabry-Perot antenna feed layer and the microstrip feed layer are shared; The microstrip feed layer includes: A third dielectric substrate layer, wherein the third dielectric substrate layer is located on the side of the ground layer away from the second dielectric substrate layer; The first microstrip line is located on the side of the third dielectric substrate layer away from the ground plane, and the first metal probe includes two differential probes that start from the grid array antenna layer, pass through the second dielectric substrate layer, the ground plane and the third dielectric substrate layer in sequence, and extend to the first microstrip line to form a corresponding feed structure.

2. The millimeter-wave antenna according to claim 1, characterized in that, The line connecting the geometric center of the grid array structure and the geometric center of the parasitic patch structure is parallel to the normal of the first dielectric substrate layer.

3. The millimeter-wave antenna according to claim 1, characterized in that, The microstrip feed layer also includes: The second microstrip line is located on the side of the third dielectric substrate layer away from the ground plane, and the second metal probe starts from the grid array antenna layer, passes through the second dielectric substrate layer, the ground plane and the third dielectric substrate layer in sequence, and extends to the second microstrip line to form a corresponding feed structure.

4. The millimeter-wave antenna according to claim 1, characterized in that, The Fabry-Perot antenna feed layer further includes a first patch antenna structure, wherein the first patch antenna structure is located on the side of the second dielectric substrate layer near the grid array antenna layer; The microstrip feed layer further includes a third microstrip line, wherein the third microstrip line is located on the side of the third dielectric substrate layer away from the ground plane, and the first patch antenna structure extends to the third microstrip line through a third metal probe that passes through the second dielectric substrate layer, the ground plane and the third dielectric substrate layer in sequence, forming a corresponding feed structure.

5. The millimeter-wave antenna according to claim 1, characterized in that, The Fabry-Perot antenna feed layer further includes a second patch antenna structure and a metallized via. The second patch antenna structure is located on the side of the second dielectric substrate layer near the grid array antenna layer and is distributed between the two differential probes included in the first metal probe. One end of the metallized via is connected to the second patch antenna structure, and the other end extends to the side of the second dielectric substrate layer near the ground plane, and a slot structure is formed at a corresponding position on the ground plane. The microstrip feed layer further includes a fourth microstrip line, wherein the fourth microstrip line is located on the side of the third dielectric substrate layer away from the ground layer, and the second patch antenna structure forms the slot-coupled feed structure of the fourth microstrip line through the metallized via and the slot structure.

6. The millimeter-wave antenna according to claim 5, characterized in that, The line connecting the geometric center of the second patch antenna structure and the geometric center of the grating array structure included in the grating array antenna layer is parallel to the normal of the second dielectric substrate layer.

7. A communication device, characterized in that, include: The millimeter-wave antenna according to any one of claims 1-6; A radio frequency signal processing device, wherein the radio frequency signal processing device is connected to the millimeter-wave antenna and is used to process the radio frequency signal received by the millimeter-wave antenna or to transmit the radio frequency signal to be transmitted through the millimeter-wave antenna.

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