An in-band full-duplex protection antenna

Abstract

The present application belongs to the field of antenna technology, and relates to an in-band full-duplex protection antenna, comprising: a patch layer, a first dielectric layer, a floor layer, a second dielectric layer, and a feed layer stacked in sequence from top to bottom; the patch layer comprises a plurality of radiating patches distributed in an array; a dividing groove is provided at a position corresponding to the second symmetry axis on the patch layer, so as to divide all radiating patches into two groups symmetrically spaced as a boundary; a group of radiating patches close to the transmitting port is a transmitting patch, and a transmitting branch is provided between any two adjacent transmitting patches along the length direction of the first dielectric layer, and an air band gap is provided on the transmitting branch; a group of radiating patches close to the receiving port is a receiving patch, and a receiving branch is provided between any two adjacent receiving patches along the length direction of the first dielectric layer, and a pair of diodes in opposite directions are provided on the receiving branch. The present application has the advantages of being able to share high-power signal transmission and reception.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an in-band full-duplex protection antenna. Background Art

[0002] In recent years, with the advancement of electronic technology, RF front-end links have been developing in the direction of miniaturization and integration. The rated working power of various types of equipment varies and inevitably affects each other. The electromagnetic compatibility problem is becoming increasingly severe. In addition, the threat of strong electromagnetic pulses in the future electromagnetic space has made the demand for protection of the RF front end increasingly urgent. Especially in some RF front-end links that require high-power transmission, it is necessary to ensure low insertion loss transmission of the link during normal operation and solve the protection problem of each component in the link. Therefore, the protective antenna was born.

[0003] In the prior art, the main ideas for researching protective antennas include: phase defocusing the reflective surface to achieve main lobe nulling, loading the feeding structure to achieve protection, and loading the radiating resonant structure to achieve resonant frequency shift.

[0004] However, the above technologies have their own shortcomings: for the reflector defocusing protection antenna, its protection is spatially selective, and the protection effect is good only in the main lobe direction, and the bandwidth is narrow; for the protection antenna loaded with the feeding structure, there is a problem of insufficient tolerance power; for the resonant reconfigurable protection antenna, there is a problem of narrow bandwidth. In addition, the existing protection antenna is only suitable for the scenario of "only transmitting but not receiving" or the scenario of low transmission signal power, and is not applicable to the scenario of high-power signal transmission or sharing an antenna at the same time. Summary of the invention

[0005] Based on this, it is necessary to provide an in-band full-duplex protection antenna to address the above-mentioned technical problems. The antenna has the advantages of shared high-power signal transmission and reception, wide applicable frequency band, large working bandwidth, low insertion loss, high power tolerance, and high port isolation efficiency.

[0006] An in-band full-duplex protection antenna comprises: a patch layer, a first dielectric layer, a floor layer, a second dielectric layer and a feed layer stacked in sequence from top to bottom;

[0007] The first dielectric layer is a rectangular structure, with the symmetry axis in the length direction of the first dielectric layer as the first symmetry axis, and the symmetry axis in the width direction of the first dielectric layer as the second symmetry axis; along the length direction of the first dielectric layer, one end is a transmitting port, and the other end is a receiving port;

[0008] The patch layer includes a plurality of radiation patches distributed in an array; a dividing groove is provided on the patch layer at a position corresponding to the second symmetry axis, so as to serve as a boundary to divide all the radiation patches into two groups symmetrically spaced apart; a group of radiation patches close to the transmitting port is a transmitting patch, and a transmitting branch is provided between any two transmitting patches adjacent along the length direction of the first dielectric layer, and an air band gap is provided on the transmitting branch; a group of radiation patches close to the receiving port is a receiving patch, and a receiving branch is provided between any two receiving patches adjacent along the length direction of the first dielectric layer, and a pair of diodes in opposite directions are provided on the receiving branch;

[0009] An isolation component is provided on the floor layer to isolate the signal of the transmitting port from the signal of the receiving port;

[0010] The feeding layer includes a transmitting feeding structure connected to the transmitting port and a receiving feeding structure connected to the receiving port.

[0011] In one embodiment, the isolation component includes: two first coupling gap structures that are symmetrically distributed with respect to the second symmetry axis;

[0012] The first coupling slot structure is a rectangular strip structure whose length direction is the same as the width direction of the first dielectric layer.

[0013] In one embodiment, the isolation component further comprises: a second coupling gap structure in an “I”-shaped structure;

[0014] The second coupling slot structure includes: a first segment and two second segments; the first segment is arranged at a position corresponding to the second symmetry axis, and both ends are respectively connected to a second segment; the second segments are axially symmetrically distributed about the first symmetry axis.

[0015] In one embodiment, the floor layer is further provided with two coupling components corresponding one to one with the second section;

[0016] The coupling component is a plate-shaped structure, and is disposed directly above the corresponding second section so as to be vertically connected to the floor layer;

[0017] The two coupling components are both distributed axially symmetrically with respect to the first section.

[0018] In one embodiment, the coupling component includes: a dielectric plate, a first line arranged on one side of the dielectric plate, and a second line arranged on the other side of the dielectric plate;

[0019] The first line and the second line are symmetrical with respect to the dielectric plate to form a parallel double-line structure.

[0020] In one embodiment, both the first line and the second line are "U"-shaped structures, and the open end of the "U"-shaped structure faces the floor layer.

[0021] In one embodiment, the feed layer further includes a plurality of groups of protection structures;

[0022] The protection structure comprises: two protection patches which are symmetrically arranged with respect to the receiving and feeding structure, and the two protection patches are connected to the receiving and feeding structure via a pair of diodes with the same direction.

[0023] In one embodiment, the transmitting feeding structure and the receiving feeding structure are axially symmetrically distributed about the second symmetry axis.

[0024] In one embodiment, the receiving feed structure includes: a receiving line;

[0025] One end of the receiving line is connected to the receiving port, and the other end extends toward the center of the second dielectric layer along the direction of the first symmetry axis.

[0026] In one embodiment, the receiving feed structure further includes: a receiving sheet;

[0027] The receiving sheet is a fan-shaped structure that is axially symmetrically distributed with respect to the receiving line, and a corner end of the fan-shaped structure is connected to the other end of the receiving line.

[0028] The above-mentioned in-band full-duplex protection antenna is an in-band co-polarization antenna with two high-isolation ports. By decoupling the transceiver ports on the same antenna and performing protection design on one of the ports, strong electromagnetic protection for the receiving port can be achieved. At the same time, the transmitting port can transmit normal high-power signals, which improves the transceiver compatibility. The combination of the patch layer, the floor layer and the feeding layer realizes the parallel connection of high-impedance components, which is conducive to impedance matching and reduces insertion loss. The antenna has the advantages of high-power signal transmission and reception, high power capacity, wide applicable frequency band, large working bandwidth, low insertion loss, high power tolerance, and high port isolation efficiency. Moreover, the transmitting branch and the receiving branch are mutually corrected to maintain the same radiation performance, which is suitable for high-power signal transmission scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is an overall schematic diagram of an in-band full-duplex protection antenna in one embodiment;

[0030] Figure 2 A schematic diagram of a patch layer of an in-band full-duplex protection antenna in one embodiment;

[0031] Figure 3 A schematic diagram of a floor layer with an in-band full-duplex protection antenna in one embodiment;

[0032] Figure 4 A three-dimensional diagram of a coupling component of an in-band full-duplex protection antenna in one embodiment;

[0033] Figure 5 A side view of a coupling component of an in-band full-duplex protection antenna in one embodiment;

[0034] Figure 6 A top view of a coupling component of an in-band full-duplex protection antenna in one embodiment;

[0035] Figure 7 A schematic diagram of a feeding layer of an in-band full-duplex protection antenna in one embodiment;

[0036] Figure 8 It is a schematic diagram of S11 simulation of an in-band full-duplex protection antenna in one embodiment;

[0037] Fig. 9 It is a schematic diagram of S21 simulation of an in-band full-duplex protection antenna in one embodiment;

[0038] Fig.10 It is a schematic diagram of S11 measured by an in-band full-duplex protection antenna in one embodiment;

[0039] Fig.11 It is a schematic diagram of S21 measured by an in-band full-duplex protection antenna in one embodiment;

[0040] Fig.12 A protection time domain waveform diagram of an in-band full-duplex protection antenna in one embodiment;

[0041] Fig.13 FIG. 4 is a diagram showing the protection effectiveness of an in-band full-duplex protection antenna in one embodiment.

[0042] Reference numerals:

[0043] Patch layer 1, transmitting patch 11, transmitting branch 12, air band gap 13, receiving patch 14, receiving branch 15, diode 16, dividing groove 17, dividing gap 18;

[0044] A first dielectric layer 2;

[0045] Floor layer 3, isolation component 31, first coupling gap structure 311, second coupling gap structure 312, coupling component 32, dielectric plate 321, first line 322, second line 323;

[0046] A second dielectric layer 4;

[0047] Feeding layer 5, transmitting line 51, transmitting sheet 52, receiving line 53, receiving sheet 54, protective structure 55;

[0048] Fixed column 6;

[0049] Transmit port A, receive port B. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0051] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0055] The present application provides an in-band full-duplex protection antenna, such as Figures 1 to 7As shown, in one embodiment, it includes: a patch layer, a first dielectric layer, a ground layer, a second dielectric layer and a feeding layer.

[0056] The patch layer, the first dielectric layer, the floor layer, the second dielectric layer and the feed layer are stacked in sequence from top to bottom, and the floor layer is equal in size to the second dielectric layer and larger than the first dielectric layer.

[0057] The first dielectric layer and the second dielectric layer are bearing layers, both of which are rectangular structures; the symmetry axis in the length direction of the first dielectric layer is the first symmetry axis, and the symmetry axis in the width direction of the first dielectric layer is the second symmetry axis; along the length direction of the first dielectric layer, one end of the antenna is the transmitting port, and the other end of the antenna is the receiving port.

[0058] The patch layer includes: multiple radiation patches; multiple radiation patches are distributed in an array to form a patch array as a metasurface radiation structure; a dividing groove is provided at a position corresponding to the second symmetry axis on the patch layer, which is used as a boundary to divide the patch array into two groups symmetrically spaced apart, with a group of radiation patches close to the transmitting port as the transmitting patch, and a group of radiation patches close to the receiving port as the receiving patch, so as to achieve isolation between the transmitting patch and the receiving patch; a transmitting branch is provided between any two transmitting patches adjacent to each other along the length direction of the first dielectric layer, and an air band gap is provided on the transmitting branch; a receiving branch is provided between any two receiving patches adjacent to each other along the length direction of the first dielectric layer, and a pair of diodes in opposite directions are provided on the receiving branch.

[0059] An isolation component is provided on the floor layer to isolate the signal of the transmitting port from the signal of the receiving port.

[0060] The feeding layer includes: a transmitting feeding structure and a receiving feeding structure; the transmitting feeding structure is connected to the transmitting port, and the receiving feeding structure is connected to the receiving port.

[0061] Preferably, the radiation patch is a square structure; a diagonal line of the square structure is arranged along the length direction of the first dielectric layer, so that the transmitting branch and the receiving branch connect the corner ends of the two radiation patches to enrich the radiation current pattern and expand the matching bandwidth.

[0062] Further preferably, the central transmitting patch and receiving patch in the radiation patch are both provided with a dividing gap along the width direction of the first dielectric layer to reduce the local impedance of the metasurface radiation structure, so that it forms a good match with the isolation component and achieves consistency in the radiation performance of the transmitting patch and the receiving patch.

[0063] In one embodiment, the isolation component includes: two first coupling slot structures; the first coupling slot structure is a rectangular strip structure, the length direction of the rectangular strip structure is the same as the width direction of the first dielectric layer, and the two first coupling slot structures are symmetrically distributed with respect to the second symmetry axis. The first coupling slot structure is used as a coupling structure to couple the signal of the transmitting port to the transmitting patch of the patch layer, or to couple the signal received by the receiving patch of the patch layer to the receiving port, so as to achieve effective propagation of electromagnetic waves.

[0064] Preferably, the isolation component further includes: a second coupling slot structure, that is, the isolation component includes: a first coupling slot structure and a second coupling slot structure; the second coupling slot structure is an "I"-shaped structure, including: a first segment and two second segments; the first segment is arranged at a position corresponding to the second symmetry axis, one end is connected to the midpoint of one second segment, and the other end is connected to the midpoint of another second segment; the second segments are axially symmetrically distributed about the first symmetry axis. The provision of the second coupling slot structure can reduce the mutual coupling between the transmission signal and the reception signal and improve the isolation.

[0065] Further preferably, two coupling components are provided on the floor layer; the coupling components are plate-shaped structures and are axially symmetrically distributed with respect to the first section; the two coupling components correspond to the two second sections one by one, and the coupling components are provided directly above the corresponding second sections, with a gap between them and the first coupling gap structure, and are vertically connected to the floor layer. The coupling components and the second sections are both located at 1 / 6 of the length of the first section (i.e.: OS =1 / 6 of the length of the first segment), that is, one-sixth of the wavelength, to match the peak value of the high-order mode at one-sixth of the wavelength and improve the isolation.

[0066] More preferably, the coupling component includes: a dielectric plate, a first line and a second line; the dielectric plate provides support for the first line and the second line; the first line is arranged on one side of the dielectric plate, and the second line is arranged on the other side of the dielectric plate; the first line and the second line are both linear strip structures, and are symmetrical about the dielectric plate to form a parallel double-line structure. The setting of the parallel double-line structure can reduce the coupling effect between the transmitting port and the receiving port, and further improve the isolation.

[0067] Further preferably, the first line and the second line are both "U"-shaped structures, there are gaps between the first line and the second line and the edge of the dielectric plate, and the open end of the "U"-shaped structure faces the floor layer to offset insufficient decoupling and slow down the rate of impedance drop to ensure impedance matching.

[0068] In one embodiment, the feed layer further includes: multiple groups of protection structures, which are arranged in an array at intervals along the direction of the first symmetry axis at the position corresponding to the receiving feed structure; the protection structure includes: two protection patches and two diodes; the two protection patches are arranged symmetrically about the receiving feed structure, and are connected to the receiving line of the receiving feed structure through a pair of diodes in the same direction; the protection patch is connected to the floor layer through a metal through hole. When the diode is cut off, the antenna works normally, the transmitting port can transmit signals normally, and the receiving port can receive signals normally; when the diode is turned on, the feed line is grounded, the transmitting port can transmit signals normally, and the receiving port cannot receive signals normally, thereby achieving protection. The protection structure is set on the feed layer, which reduces the protection pressure of the patch layer, improves the protection effect, realizes the protection of the feeding mode and the secondary protection (protection of the receiving feed structure loading diode, protection of the receiving patch loading diode), thereby improving the power capacity. In addition, it can prevent the breakdown of the diode, improve the tolerance threshold and breakdown power of the antenna, increase the protection efficiency, and ensure the life of the antenna.

[0069] In one embodiment, the transmitting feeding structure and the receiving feeding structure are completely identical and are axially symmetrically distributed about the second symmetry axis to ensure that the antenna radiation patterns corresponding to signal transmission and reception are highly consistent.

[0070] Preferably, the transmitting feed structure includes: a transmitting line, one end of which is connected to the transmitting port, and the other end of which extends toward the center of the second dielectric layer along the direction of the first symmetry axis; the receiving feed structure includes: a receiving line, one end of which is connected to the receiving port, and the other end of which extends toward the center of the second dielectric layer along the direction of the first symmetry axis. The arrangement of the transmitting line and the receiving line can maintain the structural symmetry, further ensuring that the radiation performance of the antenna is consistent with the transmitting and receiving ports.

[0071] Further preferably, the transmitting feed structure further includes: a transmitting sheet, which is a fan-shaped structure axially symmetrically distributed with respect to the transmitting line, and the corner end of the fan-shaped structure is connected to the other end of the transmitting line; the receiving feed structure further includes: a receiving sheet, which is a fan-shaped structure axially symmetrically distributed with respect to the receiving line, and the corner end of the fan-shaped structure is connected to the other end of the receiving line. The arrangement of the transmitting sheet and the receiving sheet can improve the efficiency of signal propagation.

[0072] In the present application, the antenna further includes: a non-metallic fixing post (such as a nylon stud) that penetrates the first dielectric layer, the floor layer, and the second dielectric layer, so that the antenna becomes a stable whole.

[0073] In this application, it is assumed that the side loaded with the PIN diode is the receiving port and the side not loaded is the transmitting port. When the signal is input from the transmitting port, any in-band signal can be directly radiated with low insertion loss. When the signal is received, if the signal energy is lower than the protection response threshold, the PIN diode remains in the cut-off state, so the signal can be received normally; if the signal is higher than the protection response threshold, the diode is turned on, and the energy is reflected and cannot be received to the receiving port.

[0074] The above-mentioned in-band full-duplex protection antenna is an in-band co-polarization antenna with two high-isolation ports. By decoupling the transceiver ports on the same antenna and performing protection design on one of the ports, strong electromagnetic protection for the receiving port can be achieved. At the same time, the transmitting port can transmit normal high-power signals, which improves the transceiver compatibility. The combination of the patch layer, the floor layer and the feeding layer realizes the parallel connection of high-impedance components, which is conducive to impedance matching and reduces insertion loss. The antenna has the advantages of high-power signal transmission and reception, high power capacity, wide applicable frequency band, large working bandwidth, low insertion loss, high power tolerance, and high port isolation efficiency. Moreover, the transmitting branch and the receiving branch are mutually corrected to maintain the same radiation performance, which is suitable for high-power signal transmission scenarios.

[0075] In a specific embodiment, the patch layer includes: 23 radiating patches, divided into 3 odd teams and 2 even teams, the odd team includes 5 radiating patches, connected in a row along the length direction of the first dielectric layer, the even team includes 4 radiating patches, connected in a row along the length direction of the first dielectric layer, adjacent rows are arranged at intervals, and the odd rows and the even rows are arranged alternately, that is, arranged in odd teams, even teams, odd teams, even teams, and odd teams, so that any radiating patch is parallel to the adjacent sides of the surrounding radiating patches. The size parameters of the antenna are shown in Table 1.

[0076] Table 1: Antenna dimensions

[0077]

[0078] like Figure 8 and Fig. 9 As shown in the figure, the above antenna is simulated, stage one and stage two are the optimization process, stage three is the performance after optimization, and compared with the antenna prototype. It can be seen that the reflection coefficient maintains a wide matching bandwidth, and the isolation is also reflected in the high isolation within the band.

[0079] Physical tests were carried out to compare the simulation and measured results for three situations: feeding structure loading (loading a diode on the receiving feeding structure), radiation structure loading (loading a diode on the receiving patch), and feeding + radiation structure loading.

[0080] like Fig.10 The S11 measured schematic diagram of the antenna shown is as follows: Fig.11 The S21 measured schematic diagram of the antenna is shown. It can be seen that the measured reflection coefficients of the antenna transmitting port and receiving port are well matched with the simulation. The two ports of the antenna have a good match of the measured reflection coefficient less than -10dB at 6.1GHz to 9.8GHz. At the same time, the measured isolation of the antenna is greater than 20dB within the bandwidth, and can reach up to 38dB, meeting the high isolation requirements of in-band full-duplex communication.

[0081] like Fig.12 The protection time domain waveform of the antenna shown is as follows: Fig.13 From the protection effectiveness diagram of the antenna shown, it can be seen that compared with the signal received at the transmitting port, the amplitude of the received signal at the receiving port is significantly attenuated. At the same time, the protection effectiveness of the protection antenna loaded with the feeding structure and the radiation structure reaches more than 41dB.

[0082] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0083] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An in-band full-duplex protection antenna, characterized in that: It includes stacked in order from top to bottom: a patch layer, a first dielectric layer, a floor layer, a second dielectric layer and a feed layer; The first dielectric layer is a rectangular structure, with the symmetry axis in the length direction of the first dielectric layer as the first symmetry axis, and the symmetry axis in the width direction of the first dielectric layer as the second symmetry axis; along the length direction of the first dielectric layer, one end is a transmitting port, and the other end is a receiving port; The patch layer includes a plurality of radiation patches distributed in an array; a dividing groove is provided on the patch layer at a position corresponding to the second symmetry axis, so as to serve as a boundary to divide all the radiation patches into two groups symmetrically spaced apart; a group of radiation patches close to the transmitting port is a transmitting patch, and a transmitting branch is provided between any two transmitting patches adjacent along the length direction of the first dielectric layer, and an air band gap is provided on the transmitting branch; a group of radiation patches close to the receiving port is a receiving patch, and a receiving branch is provided between any two receiving patches adjacent along the length direction of the first dielectric layer, and a pair of diodes in opposite directions are provided on the receiving branch; An isolation component is provided on the floor layer to isolate the signal of the transmitting port from the signal of the receiving port; The feed layer includes a transmitting feed structure connected to the transmitting port and a receiving feed structure connected to the receiving port; The feed layer also includes multiple groups of protection structures; The protection structure comprises: two protection patches which are symmetrically arranged with respect to the receiving and feeding structure, and the two protection patches are connected to the receiving and feeding structure via a pair of diodes with the same direction.

2. The in-band full-duplex protection antenna according to claim 1, characterized in that: The isolation component comprises: two first coupling gap structures which are symmetrically distributed with respect to the second symmetry axis; The first coupling slot structure is a rectangular strip structure whose length direction is the same as the width direction of the first dielectric layer.

3. The in-band full-duplex protection antenna according to claim 2, characterized in that: The isolation component further includes: a second coupling gap structure in an "I"-shaped structure; The second coupling slot structure includes: a first segment and two second segments; the first segment is arranged at a position corresponding to the second symmetry axis, and both ends are respectively connected to a second segment; the second segments are axially symmetrically distributed about the first symmetry axis.

4. The in-band full-duplex protection antenna according to claim 3, characterized in that: The floor layer is also provided with two coupling components corresponding one to one with the second section; The coupling component is a plate-shaped structure, and is disposed directly above the corresponding second section so as to be vertically connected to the floor layer; The two coupling components are both distributed axially symmetrically with respect to the first section.

5. The in-band full-duplex protection antenna according to claim 4, characterized in that: The coupling component comprises: a dielectric plate, a first line arranged on one side of the dielectric plate, and a second line arranged on the other side of the dielectric plate; The first line and the second line are symmetrical with respect to the dielectric plate to form a parallel double-line structure.

6. The in-band full-duplex protection antenna according to claim 5, characterized in that: The first line and the second line are both "U"-shaped structures, and the opening end of the "U"-shaped structure faces the floor layer.

7. An in-band full-duplex protection antenna according to any one of claims 1 to 6, characterized in that: The transmitting feeding structure and the receiving feeding structure are axially symmetrically distributed about the second symmetry axis.

8. The in-band full-duplex protection antenna according to claim 7, characterized in that: The receiving and feeding structure comprises: a receiving line; One end of the receiving line is connected to the receiving port, and the other end extends toward the center of the second dielectric layer along the direction of the first symmetry axis.

9. The in-band full-duplex protection antenna according to claim 8, characterized in that: The receiving and feeding structure further comprises: a receiving sheet; The receiving sheet is a fan-shaped structure that is axially symmetrically distributed with respect to the receiving line, and a corner end of the fan-shaped structure is connected to the other end of the receiving line.

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