Microstrip antenna and communication equipment

Abstract

The utility model provides a microstrip antenna and communication equipment, and relates to the technical field of antennas. According to the microstrip antenna, a radiation parasitic structure is arranged on the upper surface of a first medium carrier; the radiation structure is arranged on the upper surface of the second dielectric carrier; the metal plate is arranged on the upper surface of the third dielectric carrier, and the feed slot is etched on the metal plate; the strip line structure is arranged on the upper surface of the fourth medium carrier; the antenna ground is arranged on the lower surface of the fourth dielectric carrier. The connecting structure penetrates through the first medium carrier, and the radiation structure is connected with the radiation parasitic structure through the connecting structure. Wherein the connection structure is used for adjusting the surface current of the radiation structure and the radiation parasitic structure, and suppressing the generation of a high-order mode of the antenna in a use frequency band. According to the microstrip antenna and the communication equipment provided by the invention, the cross polarization ratio and the communication quality of the antenna can be improved, and the processing cost is reduced.

Description

Technical Field

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

[0002] The cross-polarization ratio of an antenna is an important indicator of the antenna. A good cross-polarization ratio can reduce the gain loss of its own polarization and reduce the polarization mismatch problem between the transceiver system. In addition, the lower the cross-polarization level, the higher the polarization isolation of the antenna, which is conducive to further improving the communication quality of the antenna. In the scanning of the phased array antenna, the cross-polarization will further deteriorate with the scanning angle, so microstrip antennas with a high cross-polarization ratio are of great significance.

[0003] Currently, methods for improving the cross-polarization ratio of antennas have problems such as complex processing and high cost.

[0004] Therefore, how to improve the cross-polarization ratio and communication quality of the antenna and reduce the processing cost is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The purpose of the present application is to provide a microstrip antenna and a communication device to improve the cross-polarization ratio and communication quality of the antenna and reduce the processing cost.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] On the one hand, the present application provides a microstrip antenna, which includes: a first structural layer, a second structural layer, a third structural layer, a fourth structural layer, an antenna ground and a connecting structure; the first structural layer, the second structural layer, the third structural layer, the fourth structural layer and the antenna ground are arranged in sequence.

[0008] The first structural layer includes a first dielectric carrier and a radiation parasitic structure, and the radiation parasitic structure is arranged on the upper surface of the first dielectric carrier.

[0009] The second structural layer includes a second medium carrier and a radiation structure, and the radiation structure is arranged on the upper surface of the second medium carrier.

[0010] The third structural layer includes a third dielectric carrier, a feeding slit and a metal plate. The metal plate is arranged on the upper surface of the third dielectric carrier, and the feeding slit is etched on the metal plate.

[0011] The fourth structural layer includes a fourth dielectric carrier and a stripline structure, and the stripline structure is arranged on the upper surface of the fourth dielectric carrier.

[0012] The connecting structure passes through the first dielectric carrier, and the radiating structure is connected to the radiating parasitic structure through the connecting structure; wherein the connecting structure is used to adjust the surface current of the radiating structure and the radiating parasitic structure to suppress the generation of high-order modes of the antenna within the used frequency band.

[0013] Furthermore, the first structural layer further includes a filter structure, and the filter structure is disposed on the upper surface of the first dielectric carrier, and the filter structure is connected to the radiation parasitic structure.

[0014] The microstrip antenna further comprises a feeding structure, wherein the feeding structure runs through the third dielectric carrier, the metal plate, the second dielectric carrier and the first dielectric carrier, and the stripline structure is connected to the filtering structure via the feeding structure.

[0015] Furthermore, a circular hole is etched on the metal plate, the position of the circular hole matches the feeding structure, and the feeding structure passes through the metal plate through the circular hole.

[0016] Further, the projections of the filtering structure and the radiating structure on the second dielectric carrier do not overlap, and the projections of the radiating parasitic structure and the radiating structure on the second dielectric carrier at least partially overlap.

[0017] Furthermore, the filtering structure includes a first filtering component and a second filtering component, one end of the first filtering component is connected to the midpoint of the second filtering component, the other end of the first filtering component is connected to the radiation parasitic structure, and the other end of the first filtering component is also connected to the feeding structure; the first filtering component and the second filtering component form a T-shaped filtering structure.

[0018] Further, the stripline structure includes a first stripline component and a second stripline component, one end of the first stripline component is connected to the second stripline component, the other end of the first stripline component is connected to the antenna port, and the other end of the first stripline component is also connected to the feeding structure; wherein the width of the first stripline component is smaller than the width of the second stripline component.

[0019] Furthermore, the feeding slot is orthogonal to the stripline structure.

[0020] Furthermore, the fourth structural layer further includes a plurality of isolation holes, and the plurality of isolation holes all penetrate the fourth dielectric carrier, and the plurality of isolation holes are arranged in a manner of surrounding the stripline structure.

[0021] Furthermore, the radiation structure is in a circular, rectangular or polygonal shape.

[0022] On the other hand, the present application also provides a communication device, which includes the microstrip antenna as described in any one of the aforementioned embodiments.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] The present application provides a microstrip antenna and a communication device. By setting a connection structure to connect a radiating structure and a radiating parasitic structure, the surface current of the radiating structure and the radiating parasitic structure can be affected, and the generation of the antenna mode can be further affected. By adjusting the position and size of the connection structure, the generation of high-order modes of the antenna within the use frequency band can be suppressed, thereby improving the cross-polarization ratio of the antenna.

[0025] By feeding the stripline structure, feeding slots, and feeding structure at the same time, and by parameterizing the filtering structure and changing the current path and mode on the patch, the antenna will induce currents to cancel each other out in a specific frequency range, thereby generating a radiation zero point. This further makes it impossible for the microstrip antenna to be effectively excited in the target filtering frequency band, thereby achieving a filtering effect. At the same time, within the frequency band of use, the stripline structure, feeding slots, feeding structure, and the connecting structure between the radiating structure and the radiating parasitic structure can effectively suppress the generation of high-order modes of the antenna, thereby improving the cross-polarization ratio of the antenna.

[0026] In addition, since the antenna filter structure is integrated into the radiation parasitic structure and the radiation structure, the filtering effect can be achieved without additional space or circuit branches. The number of PCB layers is not increased. It is only necessary to add a metallized feed structure during the antenna processing and add a filter pattern during the etching process to achieve the filtering suppression effect. This hardly increases the cost and difficulty for the PCB processing plant. The miniaturization of the microstrip antenna is achieved, and the structure is simple, which reduces the difficulty of the processing technology.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. 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 application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application.

[0029] Figure 1 A schematic diagram of the decomposed structure of a microstrip antenna provided in an embodiment of the present application;

[0030] Figure 2 A top view of the first structural layer provided in an embodiment of the present application;

[0031] Figure 3 A top view of the third structural layer and the fourth structural layer provided in the embodiment of the present application;

[0032] Figure 4 A simulation diagram of the cross-polarization ratio between the microstrip antenna provided in the embodiment of the present application and a conventional microstrip antenna;

[0033] Figure 5 A simulation diagram of the filtering effect of the microstrip antenna provided in the embodiment of the present application and a conventional microstrip antenna without filtering;

[0034] Figure 6 This is a simulation diagram of the antenna efficiency of the microstrip antenna provided in the embodiment of the present application and a conventional filterless microstrip antenna.

[0035] Figure numerals: 10-microstrip antenna; 100-first structural layer; 110-first dielectric carrier; 120-radiation parasitic structure; 130-filtering structure; 131-first filtering component; 132-second filtering component; 200-second structural layer; 210-second dielectric carrier; 220-radiation structure; 300-third structural layer; 310-third dielectric carrier; 320-metal plate; 330-feeding gap; 340-circular hole; 400-fourth structural layer; 410-fourth dielectric carrier; 420-stripline structure; 421-first stripline component; 422-second stripline component; 430-isolation hole; 500-antenna ground; 600-connection structure; 700-feeding structure; 800-antenna port. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. 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 application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of this application, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium.

[0039] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0040] As described in the background technology, the current method of improving the cross-polarization ratio of antennas has problems such as complex processing and high cost. Therefore, how to improve the cross-polarization ratio and communication quality of antennas and reduce processing costs is a technical problem that needs to be solved urgently by those skilled in the art.

[0041] To solve the above problems, see Figure 1 The embodiment of the present application provides a microstrip antenna 10. The microstrip antenna 10 includes a first structure layer 100, a second structure layer 200, a third structure layer 300, a fourth structure layer 400, an antenna ground 500 and a connection structure 600. The first structure layer 100, the second structure layer 200, the third structure layer 300, the fourth structure layer 400 and the antenna ground 500 are arranged in sequence.

[0042] The first structure layer 100 includes a first dielectric carrier 110 and a radiation parasitic structure 120 . The radiation parasitic structure 120 is disposed on the upper surface of the first dielectric carrier 110 .

[0043] The second structural layer 200 includes a second dielectric carrier 210 and a radiation structure 220, wherein the radiation structure 220 is disposed on the upper surface of the second dielectric carrier 210. The radiation parasitic structure 120 and the radiation structure 220 are both used for receiving or transmitting electromagnetic waves.

[0044] Optionally, the radiation structure 220 is in a circular, rectangular or polygonal shape.

[0045] The third structure layer 300 includes a third dielectric carrier 310, a feeding slot 330 and a metal plate 320. The metal plate 320 is disposed on the upper surface of the third dielectric carrier 310, and the feeding slot 330 is etched on the metal plate 320. The feeding slot 330 is used to adjust the electromagnetic wave transmitted by the stripline structure 420.

[0046] Optionally, the feeding slot 330 is an H-shaped slot structure.

[0047] The fourth structure layer 400 includes a fourth dielectric carrier 410 and a stripline structure 420 . The stripline structure 420 is disposed on the upper surface of the fourth dielectric carrier 410 for transmitting electromagnetic waves.

[0048] The antenna ground 500 is disposed on the lower surface of the fourth dielectric carrier 410 and is used as a reference ground for the stripline structure 420 to prevent signal crosstalk.

[0049] That is, the microstrip antenna 10 provided in the embodiment of the present application is composed of 5 layers of graphics and 4 layers of dielectric carriers, each layer of the graphic structure is made of metal, and each layer of graphics is connected by a dielectric carrier. The microwave dielectric carriers between each layer have a specific relative dielectric constant and loss tangent.

[0050] The connection structure 600 passes through the first dielectric carrier 110, and the radiation structure 220 is connected to the radiation parasitic structure 120 through the connection structure 600. By setting the connection structure 600, the surface current of the radiation structure 220 and the radiation parasitic structure 120 can be affected, further affecting the generation of the antenna mode. By adjusting the position and size of the connection structure 600, the generation of high-order modes of the antenna within the use frequency band can be suppressed, thereby improving the cross-polarization ratio of the antenna. In addition, the microstrip antenna 10 provided in the present application does not increase the number of layers of the PCB, has a simple structure, and reduces processing costs.

[0051] In order to further improve the cross-polarization ratio and communication quality of the antenna, and under the premise of reducing the processing cost, the inventors considered integrating the filtering characteristics with the antenna, and proposed a microstrip antenna 10 with a high cross-polarization ratio and filtering characteristics.

[0052] As a feasible implementation, the first structural layer 100 further includes a filter structure 130. The filter structure 130 is disposed on the upper surface of the first dielectric carrier 110. Furthermore, the filter structure 130 is connected to the radiation parasitic structure 120, that is, the filter structure 130 is integrated into the radiation parasitic structure 120. The filter structure 130 is used to adjust the radiation zero point position of the antenna, and the radiation zero point is used to indicate the frequency band to be filtered.

[0053] The microstrip antenna 10 further includes a feeding structure 700, which penetrates the third dielectric carrier 310, the metal plate 320, the second dielectric carrier 210 and the first dielectric carrier 110, and the stripline structure 420 is connected to the filtering structure 130 through the feeding structure 700. The feeding structure 700 is used to transmit electromagnetic wave signals.

[0054] Optionally, the feeding structure 700 and the connecting structure 600 are both metallized through holes.

[0055] It should be noted that when the feeding structure 700 passes through the third dielectric carrier 310 , it is easy to cause one end of the feeding structure 700 to be connected to the stripline structure 420 and the other end to be connected to the metal plate 320 , thereby forming a short circuit.

[0056] In order to avoid the problem of short circuit of the feeding structure 700, in the embodiment of the present application, a circular hole 340 is further etched on the metal plate 320, the position of the circular hole 340 matches the feeding structure 700, and the feeding structure 700 passes through the metal plate 320 through the circular hole 340. The metal plate 320 in the third structure layer 300 is equivalent to the reference ground of the filter structure 130 and the radiation parasitic structure 120 in the first structure layer 100.

[0057] In addition, in the embodiment of the present application, the fourth structure layer 400 further includes a plurality of isolation holes 430, and the plurality of isolation holes 430 all penetrate the fourth dielectric carrier 410. The plurality of isolation holes 430 are arranged in a manner of surrounding the stripline structure 420, thereby achieving good matching of the stripline structure 420 and avoiding cavity resonance and leakage.

[0058] Based on the above design, the working mode of the microstrip antenna 10 provided in the embodiment of the present application is the following two mixed working modes:

[0059] The first working mode: After the electromagnetic wave signal is transmitted to the stripline structure 420 in the fourth structure layer 400 through the antenna port, the stripline structure 420 couples the electromagnetic wave signal to the radiation structure 220 in the second structure layer 200 through the feeding slot 330 in the third structure layer 300. The radiation structure 220 interacts with the radiation parasitic structure 120 through the connecting structure 600 to jointly radiate or receive electromagnetic waves into space.

[0060] The second working mode: After the electromagnetic wave signal is transmitted to the stripline structure 420 in the fourth structure layer 400 through the antenna port, the stripline structure 420 transmits the electromagnetic wave signal to the filter structure 130 and the radiation parasitic structure 120 in the first structure layer 100 through the feeding structure 700, and then interacts with the radiation structure 220 in the second structure layer 200 to jointly radiate or receive electromagnetic waves into space.

[0061] When the two working modes are mixed, the antenna will produce a radiation null and improve the cross-polarization ratio.

[0062] Since the second working mode of the microstrip antenna 10 is that the electromagnetic wave is directly transmitted from the stripline structure 420 to the filter structure 130 in the first structure layer 100 through the feeding structure 700, in order to ensure that the feeding structure 700 is not connected to the radiation structure 220 in the second structure layer 200. In the embodiment of the present application, the projections of the filter structure 130 and the radiation structure 220 on the second dielectric carrier 210 do not overlap.

[0063] Furthermore, the projections of the radiation parasitic structure 120 and the radiation structure 220 on the second dielectric carrier 210 at least partially overlap, ensuring that one end of the connection structure 600 is connected to the radiation parasitic structure 120 and the other end is connected to the radiation structure 220 .

[0064] To better illustrate the shape and position relationship of each layer of graphic structure, please refer to Figure 2 and Figure 3 .in, Figure 2 is a top view of the first structural layer 100, Figure 3 It is a top view of the third structure layer 300 and the fourth structure layer 400 .

[0065] See also Figure 2 In the embodiment of the present application, the filter structure 130 includes a first filter component 131 and a second filter component 132. One end of the first filter component 131 is connected to the midpoint of the second filter component 132, the other end of the first filter component 131 is connected to the radiation parasitic structure 120, and the other end of the first filter component 131 is also connected to the feeding structure 700. The first filter component 131 and the second filter component 132 form a T-shaped filter structure 130.

[0066] The length L2 of the first filter component 131, the length L1 of the second filter component 132, the width W2 of the first filter component 131, and the width W1 of the second filter component 132 mainly affect the depth of filtering suppression, and adjust the impedance matching of the antenna together with the length Patch_y of the radiating parasitic structure 120 and the width Patch_x of the radiating parasitic structure 120. The distance L3 between the feeding structure 700 and the connecting structure 600 mainly affects the frequency response of the cross-polarization ratio optimization.

[0067] See also Figure 3 In the embodiment of the present application, the feed slot 330 is orthogonal to the stripline structure 420, and the stripline structure 420 includes a first stripline component 421 and a second stripline component 422. One end of the first stripline component 421 is connected to the second stripline component 422, the other end of the first stripline component 421 is connected to the antenna port 800, and the other end of the first stripline component 421 is also connected to the feed structure 700. The width of the first stripline component 421 is less than the width of the second stripline component 422.

[0068] Optionally, the number of antenna ports 800 may be one or more, and the antenna may be single-polarized or dual-polarized.

[0069] The width Feed_W1 of the first stripline structure 420 and the distance Feed_L1 between the feeding structure 700 and point A mainly affect the position of the radiation zero point. Point A is the intersection of the projection of the feeding slot 330 on the stripline structure 420 and the stripline structure 420 .

[0070] It should be noted that the above parameters can be adjusted according to actual project needs.

[0071] By simultaneously feeding the stripline structure 420, the feeding slot 330, and the feeding structure 700, and by parameter designing the filtering structure 130, the current path and mode on the patch are changed, and the induced currents of the antenna cancel each other out in a specific frequency range, thereby generating a radiation zero point. This further makes it impossible for the microstrip antenna 10 to be effectively excited in the target filtering frequency band, thereby achieving a filtering effect. At the same time, within the frequency band of use, the stripline structure 420, the feeding slot 330, the feeding structure 700, and the connecting structure 600 between the radiating structure 220 and the radiating parasitic structure 120 can effectively suppress the generation of high-order modes of the antenna, thereby improving the cross-polarization ratio of the antenna.

[0072] See also Figure 4 , Figure 4 A simulation diagram of the cross-polarization ratio of the microstrip antenna 10 provided in the embodiment of the present application and a conventional microstrip antenna. The embodiment of the present application designs an antenna operating at 10.7 GHz-12.7 GHz. From the simulation results, it can be seen that the cross-polarization ratio of the antenna designed in the present application is between 53 dB and 67 dB, which is 18 dB to 35 dB higher than that of a conventional microstrip antenna, achieving a significant improvement in the cross-polarization ratio performance of the antenna.

[0073] See also Figure 5 , Figure 5The filtering effect simulation diagram of the microstrip antenna 10 provided in the embodiment of the present application and the conventional non-filtering microstrip antenna. The embodiment of the present application designs an antenna that works at 10.7GHz-12.7GHz. From the simulation results, it can be seen that the microstrip antenna 10 of the present application has a good filtering effect in the broadband from 13.5GHz-14.5GHz, forms a radiation zero point at 13.7GHz, and has a gain suppression of 10dB-23dB in the suppression frequency band, realizing the filtering function of the antenna.

[0074] In addition, since the microstrip antenna 10 provided by the present application combines multiple feeding modes and the filtering structure 130 to achieve filtering characteristics, almost no additional loss is generated. Figure 6 As shown, under the same dielectric carrier, the antenna efficiency of the microstrip antenna 10 provided in the present application is almost the same as that of the conventional filterless antenna, and the difference is within 1.5%, indicating that the microstrip antenna 10 provided in the present application does not generate additional losses, and effectively solves the problem of high loss of filtering antennas in conventional projects.

[0075] Furthermore, an embodiment of the present application also provides a communication device, which includes a microstrip antenna 10 as described in any of the above embodiments. In summary, the present application provides a microstrip antenna and a communication device. By setting a connection structure to connect the radiating structure and the radiating parasitic structure, the surface current of the radiating structure and the radiating parasitic structure can be affected, further affecting the generation of the antenna mode. By adjusting the position and size of the connection structure, the generation of high-order modes of the antenna within the use frequency band can be suppressed, thereby improving the cross-polarization ratio of the antenna.

[0076] By feeding the stripline structure, feeding slots, and feeding structure at the same time, and by parameterizing the filtering structure and changing the current path and mode on the patch, the antenna will induce currents to cancel each other out in a specific frequency range, thereby generating a radiation zero point. This further makes it impossible for the microstrip antenna to be effectively excited in the target filtering frequency band, thereby achieving a filtering effect. At the same time, within the frequency band of use, the stripline structure, feeding slots, feeding structure, and the connecting structure between the radiating structure and the radiating parasitic structure can effectively suppress the generation of high-order modes of the antenna, thereby improving the cross-polarization ratio of the antenna.

[0077] In addition, since the antenna filter structure is integrated into the radiation parasitic structure and the radiation structure, the filtering effect can be achieved without additional space or circuit branches. The number of PCB layers is not increased. It is only necessary to add a metallized feed structure during the antenna processing and add a filter pattern during the etching process to achieve the filtering suppression effect. This hardly increases the cost and difficulty for the PCB processing plant. The miniaturization of the microstrip antenna is achieved, and the structure is simple, which reduces the difficulty of the processing technology.

[0078] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0079] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A microstrip antenna, characterized in that: The microstrip antenna comprises: a first structure layer, a second structure layer, a third structure layer, a fourth structure layer, an antenna ground and a connection structure; the first structure layer, the second structure layer, the third structure layer, the fourth structure layer and the antenna ground are arranged in sequence; The first structural layer includes a first dielectric carrier and a radiation parasitic structure, and the radiation parasitic structure is arranged on the upper surface of the first dielectric carrier; The second structural layer includes a second medium carrier and a radiation structure, and the radiation structure is arranged on the upper surface of the second medium carrier; The third structural layer includes a third dielectric carrier, a feeding slit and a metal plate, wherein the metal plate is arranged on the upper surface of the third dielectric carrier, and the feeding slit is etched on the metal plate; The fourth structural layer includes a fourth dielectric carrier and a stripline structure, and the stripline structure is arranged on the upper surface of the fourth dielectric carrier; The connecting structure passes through the first dielectric carrier, and the radiating structure is connected to the radiating parasitic structure through the connecting structure; wherein the connecting structure is used to adjust the surface current of the radiating structure and the radiating parasitic structure to suppress the generation of high-order modes of the antenna within the used frequency band.

2. The microstrip antenna according to claim 1, characterized in that: The first structural layer further includes a filter structure, which is disposed on the upper surface of the first dielectric carrier and is connected to the radiation parasitic structure; The microstrip antenna further comprises a feeding structure, wherein the feeding structure runs through the third dielectric carrier, the metal plate, the second dielectric carrier and the first dielectric carrier, and the stripline structure is connected to the filtering structure via the feeding structure.

3. The microstrip antenna according to claim 2, characterized in that: A circular hole is also etched on the metal plate. The position of the circular hole matches the feeding structure. The feeding structure passes through the metal plate through the circular hole.

4. The microstrip antenna according to claim 2, characterized in that: The projections of the filtering structure and the radiating structure on the second dielectric carrier do not overlap, and the projections of the radiating parasitic structure and the radiating structure on the second dielectric carrier at least partially overlap.

5. The microstrip antenna according to claim 2, characterized in that: The filtering structure includes a first filtering component and a second filtering component, one end of the first filtering component is connected to the midpoint of the second filtering component, the other end of the first filtering component is connected to the radiation parasitic structure, and the other end of the first filtering component is also connected to the feeding structure; the first filtering component and the second filtering component form a T-shaped filtering structure.

6. The microstrip antenna according to claim 2, characterized in that: The stripline structure includes a first stripline component and a second stripline component, one end of the first stripline component is connected to the second stripline component, the other end of the first stripline component is connected to the antenna port, and the other end of the first stripline component is also connected to the feeding structure; wherein the width of the first stripline component is smaller than the width of the second stripline component.

7. The microstrip antenna according to claim 1, characterized in that: The feed slot is orthogonal to the stripline structure.

8. The microstrip antenna according to claim 1, characterized in that: The fourth structural layer further includes a plurality of isolation holes, each of which penetrates the fourth dielectric carrier, and the plurality of isolation holes are arranged in a manner of surrounding the stripline structure.

9. The microstrip antenna according to claim 1, characterized in that: The shape of the radiation structure is circular, rectangular or polygonal.

10. A communication device, characterized in that: The microstrip antenna comprises any one of claims 1 to 9.

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