Non-reciprocal antenna

Abstract

The present application discloses a non-reciprocal antenna. The non-reciprocal antenna includes two polarization deflection wave plates, a circularly polarized non-reciprocal antenna cover and a base antenna, wherein the circularly polarized non-reciprocal antenna cover is located between the two polarization deflection wave plates, and the base antenna is arranged on one of the polarization deflection wave plates; the polarization deflection wave plate includes a hollow first dielectric plate, and a plurality of gratings are arranged on the first surface and the second surface of the first dielectric plate, and a plurality of metal bent strips are arranged between each adjacent two gratings. The non-reciprocal antenna of the present application combines the circularly polarized non-reciprocal antenna cover with the base antenna, and relies on an external magnetic field to realize the non-reciprocal unidirectional asymmetric transmission of polarized electromagnetic waves and the isolation of electromagnetic energy, which can effectively detect electromagnetic signals, and can shield strong external electromagnetic pulse signals of the same frequency, thereby protecting the RF circuit at the front end of the antenna.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a non-reciprocal antenna. Background Art

[0002] In modern electronic countermeasures, electromagnetic space is the main battlefield of electronic countermeasures, and information and activities based on electromagnetic activities are the direct combat targets of electronic countermeasures. Antennas are devices that radiate or receive electromagnetic waves into space in radio transceiver systems, and are an indispensable part of radio communication systems. In modern radio communication, broadcasting, navigation, electronic countermeasures, remote sensing and other engineering systems, antennas are used to transmit or receive electromagnetic waves to transmit information. In addition, in terms of wireless energy transmission, non-signal energy radiation also requires antennas. Electronic countermeasure antennas are conversion devices between electromagnetic waves and radio frequency currents. Generally, electronic countermeasure antennas are reversible, that is, the same antenna can be used as both a transmitting antenna and a receiving antenna. The basic characteristic parameters of the same antenna as a transmitter or a receiver are the same, which is the reciprocity theorem of the antenna. Therefore, the antenna in the transmitting system and the front-end radio frequency circuit of the antenna are easily penetrated by the same-frequency electromagnetic pulses of the hostile target. Summary of the invention

[0003] The purpose of the present application is to provide a non-reciprocal antenna. In order to have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important components or to describe the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0004] According to one aspect of an embodiment of the present application, a non-reciprocal antenna is provided, comprising two polarization deflection wave plates, a circularly polarized non-reciprocal antenna cover and a base antenna, wherein the circularly polarized non-reciprocal antenna cover is located between the two polarization deflection wave plates, and the base antenna is arranged on one of the polarization deflection wave plates; the polarization deflection wave plate comprises a hollow first dielectric plate, a plurality of gratings are arranged on the first surface and the second surface of the first dielectric plate, and a plurality of metal bent strip sheets are arranged between each adjacent two gratings.

[0005] In some embodiments, a direction in which the gratings on the first surface are arranged on the first surface is perpendicular to a direction in which the gratings on the second surface are arranged on the second surface.

[0006] In some embodiments, the two polarization deflection wave plates are respectively a first polarization deflection wave plate and a second polarization deflection wave plate; and a plurality of magnets are respectively disposed on a first surface and a second surface of the circularly polarized non-reciprocal radome.

[0007] In some embodiments, the first surface of the circularly polarized non-reciprocal antenna cover is opposite to the second surface of the first polarization deflection wave plate, and the second surface of the circularly polarized non-reciprocal antenna cover is opposite to the first surface of the second polarization deflection wave plate; all magnets on the first surface of the circularly polarized non-reciprocal antenna cover correspond one-to-one in position to all metal bent strips on the second surface of the first polarization deflection wave plate, and all magnets on the second surface of the circularly polarized non-reciprocal antenna cover correspond one-to-one in position to all metal bent strips on the first surface of the second polarization deflection wave plate.

[0008] In some embodiments, the circularly polarized non-reciprocal radome includes at least two dielectric plates, and an iron oxide material plate is arranged between two adjacent dielectric plates; copper sheets are respectively arranged at positions corresponding to the magnets on each outermost dielectric plate of the circularly polarized non-reciprocal radome.

[0009] In some embodiments, the magnet is made of magnetic material.

[0010] In some embodiments, the magnet is a cylindrical structure, and the bottom surface of the cylinder has the same shape and size as the surface of the copper sheet.

[0011] In some embodiments, the relative dielectric constant of each dielectric plate is 2.2 and the loss tangent is 0.001.

[0012] In some embodiments, the ferrite material plate has a relative dielectric constant of 14.5, a magnetization saturation of 1800 Gauss, and a thickness of 0.5 mm.

[0013] In some embodiments, the radius of the magnet is 2.2 mm.

[0014] In some embodiments, the copper sheet has a thickness of 0.035 mm.

[0015] The technical solution provided by one aspect of the embodiments of the present application may have the following beneficial effects:

[0016] The non-reciprocal antenna provided in the embodiment of the present application combines a circularly polarized non-reciprocal antenna cover with a base antenna, and relies on an external magnetic field to achieve non-reciprocal unidirectional asymmetric transmission of polarized electromagnetic waves and isolation of electromagnetic energy. It can effectively detect electromagnetic signals and can shield strong external electromagnetic pulse signals of the same frequency, thereby protecting the RF circuit at the front end of the antenna.

[0017] Other features and advantages of the present application will be described in the subsequent description, and some of them will become obvious from the description, or some of them can be inferred or determined unambiguously from the description, or can be understood by implementing the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the decomposed structure of a non-reciprocal antenna provided in an embodiment of the present application.

[0020] Figure 2 A schematic diagram of the three-dimensional structure of the polarization deflection wave plate provided in an embodiment of the present application.

[0021] Figure 3 for Figure 2 Schematic diagram of the first surface of the polarization deflection wave plate shown.

[0022] Figure 4 for Figure 2 Schematic diagram of the second surface of the polarization deflection wave plate shown.

[0023] Figure 5 A schematic diagram of the exploded structure of the circularly polarized non-reciprocal radome provided in an embodiment of the present application.

[0024] Figure 6 for Figure 5 Schematic diagram of the copper sheet on the first surface of the circularly polarized non-reciprocal radome.

[0025] Figure 7 for Figure 5 A front view schematic diagram of the copper sheet on the second surface of the circularly polarized non-reciprocal radome is shown.

[0026] Figure 8 for Figure 5 Schematic diagram of the back side of the copper sheet on the second surface of the circularly polarized non-reciprocal radome.

[0027] Fig. 9 This is an S parameter curve of the polarization deflection wave plate provided in an embodiment of the present application that converts a partially linearly polarized electromagnetic wave into a circularly polarized electromagnetic wave when incident.

[0028] Fig.10 Different S parameter curves when different circularly polarized electromagnetic waves are incident on the circularly polarized non-reciprocal radome part provided in the embodiment of the present application.

[0029] Fig.11 This is the S parameter curve of the entire non-reciprocal antenna provided in the embodiment of the present application.

[0030] Figure numerals: 1. Polarization deflection wave plate, 2. Circular polarization non-reciprocal antenna cover, 3. Basic antenna, 4. Magnet, 5. Grating, 6. Metal bent strip, 7. Fabry-Pérot cavity.

[0031] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described below in conjunction with the accompanying drawings and specific 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.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0034] The terms "first", "second", "third", etc. are only used to distinguish descriptions and should not be understood as indicating or implying relative importance. It should also be understood that although the terms "first", "second", "third", etc. are used in the text to describe various objects in some embodiments of the present application, these objects should not be limited by these terms. These terms are only used to distinguish various objects.

[0035] like Figure 1 As shown, an embodiment of the present application provides a non-reciprocal antenna, including two polarization deflection wave plates 1, a circularly polarized non-reciprocal antenna cover 2 and a base antenna 3, wherein the circularly polarized non-reciprocal antenna cover 2 is located between the two polarization deflection wave plates 1, and the base antenna 3 is arranged on one of the polarization deflection wave plates 1; the polarization deflection wave plate 1 includes a hollow first dielectric plate, a plurality of gratings are arranged on the first surface and the second surface of the first dielectric plate, and a plurality of metal bent strip sheets 6 are arranged between each adjacent two gratings.

[0036] The arrangement direction of the gratings on the first surface on the first surface and the arrangement direction of the gratings on the second surface on the second surface are perpendicular to each other.

[0037] The two polarization deflection wave plates 1 are respectively a first polarization deflection wave plate and a second polarization deflection wave plate; a plurality of magnets are respectively arranged on the first surface and the second surface of the circularly polarized non-reciprocal radome 2 .

[0038] The first surface of the circularly polarized non-reciprocal antenna cover 2 is opposite to the second surface of the first polarization deflection wave plate, and the second surface of the circularly polarized non-reciprocal antenna cover 2 is opposite to the first surface of the second polarization deflection wave plate; all the magnets on the first surface of the circularly polarized non-reciprocal antenna cover 2 correspond one-to-one in position to all the metal bent strip pieces 6 on the second surface of the first polarization deflection wave plate, and all the magnets on the second surface of the circularly polarized non-reciprocal antenna cover 2 correspond one-to-one in position to all the metal bent strip pieces 6 on the first surface of the second polarization deflection wave plate.

[0039] The circularly polarized non-reciprocal radome 2 comprises at least two dielectric plates, and an iron oxide material plate is arranged between two adjacent dielectric plates; copper sheets are respectively arranged at positions corresponding to the magnets on each outermost dielectric plate of the circularly polarized non-reciprocal radome 2 .

[0040] The magnet is made of magnetic material and has a cylindrical structure, and the bottom surface of the cylinder and the surface of the copper sheet have the same shape and size.

[0041] The relative dielectric constant of each dielectric plate is 2.2, and the loss tangent is 0.001. The relative dielectric constant of the ferrite material plate is 14.5, the magnetization saturation is 1800 Gauss, and the thickness is 0.5 mm. The radius of the magnet is 2.2 mm, and the thickness of the copper sheet is 0.035 mm.

[0042] The non-reciprocal antenna provided in the embodiment of the present application, the circularly polarized non-reciprocal antenna cover is combined with the base antenna, and relies on an external magnetic field to achieve non-reciprocal unidirectional asymmetric transmission of polarized electromagnetic waves and electromagnetic energy isolation, which can effectively detect electromagnetic signals and can shield strong external electromagnetic pulse signals of the same frequency, thereby protecting the RF circuit at the front end of the antenna.

[0043] In some embodiments, reference Figures 1 to 8 As shown, the non-reciprocal antenna is a composite structure, which includes three parts: a polarization deflection wave plate 1, a circularly polarized non-reciprocal antenna cover 2 and a base antenna 3.

[0044] The polarization deflection wave plate 1 is composed of a two-layer structure and is used to achieve mutual conversion between linear polarization and circular polarization electromagnetic waves.

[0045] The circularly polarized non-reciprocal radome 2 is a multi-layer stacked structure, and as shown in the figure, it is a stacked structure consisting of 3 layers. The circularly polarized non-reciprocal radome 2 can be a stacked structure of 2, 3, 4...N layers, where N is a positive integer. The circularly polarized non-reciprocal radome 2 is used to achieve non-reciprocal propagation of circularly polarized electromagnetic waves through an external magnetic field.

[0046] The basic antenna 3 may be a common horn antenna, but is not limited to a horn antenna, and may also include other linear polarization antennas.

[0047] The non-reciprocal antenna provided in the embodiment of the present application is a non-reciprocal, unidirectional non-reciprocal antenna that can achieve asymmetric transmission of electromagnetic waves and energy isolation. It can use an external magnetic field to break the time reversal symmetry and is suitable for the field of electromagnetic countermeasures or electromagnetic compatibility.

[0048] The non-reciprocal antenna comprises a polarization deflection wave plate 1 , a circularly polarized non-reciprocal radome 2 and a base antenna 3 .

[0049] The polarization deflection wave plate 1 is composed of two layers of composite structure: an upper and a lower orthogonal grating structure.

[0050] The circularly polarized non-reciprocal antenna cover 2 is composed of a three-layer structure: the middle layer is a structure of different sizes, the upper layer and the lower layer are of the same structure, and the upper layer and the lower layer are spatially symmetrical about the middle layer, and a vertical magnetic field is added outside the structure, which can make the transmission coefficient of a circularly polarized electromagnetic wave different when incident from the positive direction and the reverse direction. This characteristic can be used to achieve asymmetric transmission of circularly polarized electromagnetic waves.

[0051] The structural dimensions of the polarization deflection wave plate 1 and the circular polarization non-reciprocal radome 2 are consistent with the working frequency band, and they are combined to form a non-reciprocal magnet for linearly polarized electromagnetic waves.

[0052] The base antenna 3 is a common linearly polarized antenna operating in a wide-band, and is composed of the base antenna 3 and a magnetic body to form a wide-band linearly polarized non-reciprocal antenna.

[0053] The embodiment of the present application combines a polarization deflection wave plate, a circularly polarized non-reciprocal antenna cover and a basic antenna, and relies on an external magnetic field to achieve non-reciprocal unidirectional asymmetric transmission of polarized electromagnetic waves and isolation of electromagnetic energy. The polarization deflection wave plate and the circularly polarized non-reciprocal antenna cover in the present application are designed using composite structure metamaterials, and the ingenious combination of the two realizes a linearly polarized non-reciprocal antenna cover. When the designed linearly polarized non-reciprocal antenna cover is added to the front end of the basic antenna, the electromagnetic waves and electromagnetic energy radiated by the antenna can pass through the linearly polarized non-reciprocal antenna cover to achieve the transmission of radiation and information energy; and when the electromagnetic wave is incident on the basic antenna from the outside, due to the presence of the linearly polarized non-reciprocal antenna cover, the antenna acts as a receiver, and the electromagnetic wave energy cannot enter the receiving antenna, thereby forming an asymmetric transmission. Especially in electronic countermeasures, the designed non-reciprocal antenna can effectively detect electromagnetic signals, and can shield strong electromagnetic pulse signals of the same frequency from the outside, thereby protecting the radio frequency circuit at the front end of the antenna.

[0054] The non-reciprocal antenna of the embodiment of the present application is a unidirectional transmission non-reciprocal antenna, which realizes asymmetric transmission of electromagnetic waves. The non-reciprocal antenna is a composite structure, which includes three parts: a polarization deflection wave plate 1, a circularly polarized non-reciprocal antenna cover 2 and a base antenna 3.

[0055] The polarization deflection wave plate 1 is composed of a two-layer structure, including: mutually perpendicular gratings 5 ​​on the front and rear surfaces and metal bent strips 6, forming a Fabry-Perot cavity 7, which can achieve bandwidth expansion and realize the conversion of broadband linearly polarized electromagnetic waves to circularly polarized electromagnetic waves. The specific function realization principle is as follows: first, when the linearly polarized wave is incident on the polarization deflection wave plate 1, the linearly polarized wave is transmitted through the first layer and no reflection is achieved; due to the existence of the Fabry-Perot cavity, the linearly polarized electromagnetic wave resonates in the Fabry-Perot cavity and is decomposed into x-polarized and y-polarized electromagnetic waves, and the phase difference between the two is 90 degrees, so the emitted electromagnetic wave is a circularly polarized electromagnetic wave.

[0056] The circularly polarized non-reciprocal radome 2 is composed of a three-layer structure, including: front and rear periodic disc layers with the same structure, and the front and rear layers are spatially symmetrical about the middle layer to achieve a wide band of circular polarization, and the size of the metal disc structure of the middle layer is different from that of the front and rear layers. The external magnetic field is applied perpendicular to the structure, and the realization of the external magnetic field includes the following: Figure 3 The external magnet in the embodiment can also be used in other ways to achieve asymmetric non-reciprocal propagation and transmission of circularly polarized electromagnetic waves. In this embodiment, the front-to-back transmission of right-handed circularly polarized electromagnetic waves is achieved, while the back-to-back right-handed circularly polarized electromagnetic waves cannot be transmitted; and the non-reciprocal switching of different circularly polarized electromagnetic waves can be achieved by switching the external electromagnetic field.

[0057] In the preferred solution of this embodiment, the perimeter of each periodic unit structure of the polarization deflection wave plate 1 is 6.0 mm and the thickness is 2.0 mm. The dielectric plate used is F4BTMS with a relative dielectric constant of 2.2 and a loss tangent of 0.001. For example, Figure 2 As shown in the figure, the broadband polarization deflection wave plate is composed of a front and back vertical grating and a folded sickle structure, wherein the width of the metal strip is w1 = 1mm, w2 = 1mm, the length of the metal strip is L1 = 2.1mm, L2 = 3.9mm, the period P = 6mm, and the distance between the metal strip and the boundary is ds1 = 0.75mm, ds2 = 0.76mm, ds3 = 0.43mm, which can achieve a conversion rate of more than 90% from linear polarization to circular polarization electromagnetic waves between 14GHz and 17.5GHz, as shown in the figure. Fig. 9 shown.

[0058] In the preferred solution of this embodiment, the circularly polarized non-reciprocal radome has a three-layer structure, such as Figure 3 As shown, the three-layer structure is ferrite material, the relative dielectric constant of the ferrite material is 14.5, the magnetization saturation is 1800 Gauss, and the thickness is dm2=0.5mm. The radius of the metal discs of the upper and lower layers of the three-layer structure is R1=2.2mm, R3=2.2mm, and the thickness of the metal copper is 0.035mm. It is covered on a dielectric plate with a thickness of dm1=0.127mm and a relative dielectric constant of 2.2, and the first layer structure and the third layer structure are symmetrical about the middle layer in space. The radius of the metal disc of the middle layer is R2=2.55mm, and it is clamped by a dielectric plate with a thickness of 0.127mm to achieve spatial symmetry. Only by applying a magnetic field perpendicular to the structure, that is, along the z direction, can the non-reciprocal effect of circularly polarized electromagnetic waves be generated. In this embodiment, a strong magnet with a radius of Rg=2mm and a thickness of dg=1mm is used to generate a magnetic field of 0.2mT. When an external magnetic field is added, the circularly polarized non-reciprocal radome can achieve more than 90% transmission of right-handed circularly polarized electromagnetic waves in the 16GHz-17.2GHz frequency band when incident forward, while its transmission efficiency is less than 10% when the right-handed circularly polarized electromagnetic waves are incident backward. Fig.10 shown.

[0059] In the preferred scheme of this embodiment, the polarization rotation wave plate 1 and the circular polarization non-reciprocal antenna cover 2 are integrated to form a linear polarization non-reciprocal antenna cover, which is composed of two polarization rotation wave plates and one circular polarization non-reciprocal antenna cover, and the two polarization deflection wave plates are rotationally symmetric about the circular polarization non-reciprocal antenna cover 2 in space, wherein the distance H between the polarization rotation wave plate 1 and the circular polarization non-reciprocal antenna cover 2 is 4mm, and the transmittance at 16.2GHz-17.2GHz linear polarization forward incidence is greater than 90%, and the transmittance at backward incidence is less than 10%. Fig.11 shown.

[0060] The metal disc unit structure in the circularly polarized non-reciprocal radome used in this application can also be designed as a square or other structure, and the same effect can be achieved. All dielectric plates can use dielectrics with lower loss or lower relative dielectric constants to further reduce passband insertion loss, as long as the relative dielectric constant and loss and thickness of the material meet good impedance matching.

[0061] In view of the problems existing in the related art, the non-reciprocal antenna provided by the present application has excellent electromagnetic performance, can realize the asymmetric transmission of electromagnetic waves and the isolation of non-reciprocity and electromagnetic energy, and overcome the problems existing in the above-mentioned related art. The non-reciprocal antenna provided in the embodiment of the present application breaks the time reversal symmetry, and the unit structure consists of three parts, a polarization deflection wave plate 1, a circularly polarized non-reciprocal antenna cover 2 and a base antenna 3, wherein the physical dimensions of the polarization deflection wave plate 1 and the circularly polarized non-reciprocal antenna cover 2 are consistent with the working frequency band.

[0062] In the information system during electromagnetic confrontation, it can effectively radiate the signals of its own system and shield and isolate external high-power attack electromagnetic pulse signals, thereby protecting the front-end RF circuit of its own antenna system. The ferromagnetic material that breaks the time reversal symmetry plays an important role, enabling the design to achieve asymmetric transmission of electromagnetic waves and unidirectional transmission of electromagnetic waves. Breaking through the reciprocity characteristics of existing antennas, the polarization rotation structure of electromagnetic metamaterials, ferromagnetic materials, etc. are introduced into the design of non-reciprocal antennas. This application utilizes polarization rotation wave plates and circularly polarized non-reciprocal antenna covers, and combines the ferromagnetic material design of an external magnetic field to achieve the index requirements of non-reciprocal transmission, so that it meets the actual needs of antenna electrical performance and strong electromagnetic pulse suppression.

[0063] The embodiment of the present application discloses a non-reciprocal antenna that can realize non-reciprocal asymmetric unidirectional transmission of linear polarized electromagnetic waves, including a polarization deflection wave plate 1, a circularly polarized non-reciprocal antenna cover 2 and a basic antenna 3. The polarization deflection wave plate is composed of two layers of conforming structures: an orthogonal grating structure and an obliquely placed metal bent strip sheet 6 structure; the circularly polarized non-reciprocal antenna cover is composed of a three-layer structure: the upper and lower layers are composed of metal discs of the same size, which are rotationally symmetrical about the middle layer, and the middle layer is a metal disc of different sizes. By adding magnets on the upper and lower sides, an external magnetic field is provided, so that the circularly polarized electromagnetic wave can radiate the transmission signal in the forward direction but the reverse circularly polarized incident electromagnetic wave cannot be transmitted. This characteristic can be combined with a polarization polarization wave plate to realize non-reciprocal asymmetric transmission of linear polarized electromagnetic waves. Together with the basic antenna, the non-reciprocal antenna is designed, which can radiate its own signal, but the external signal cannot be received by the transmitting antenna, thereby preventing it from being attacked by external strong electromagnetic pulse signals.

[0064] The present application overcomes the defect that the reciprocal antenna in the related art cannot realize unidirectional transmission. It realizes the non-reciprocal and asymmetric transmission of linearly polarized electromagnetic waves by cascading a circularly polarized non-reciprocal antenna cover that breaks the time reversal symmetry and a polarization rotation wave plate. The structure is simple and the preparation is convenient.

[0065] The present application utilizes the design of an external magnetic field to break the time reversal symmetry and realize non-reciprocity, so that circularly polarized electromagnetic waves can be transmitted in one direction. By switching the direction of the external magnetic field, the transmission of different circularly polarized electromagnetic waves can be switched.

[0066] It should be noted that:

[0067] The above-mentioned embodiments only express the 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 modifications 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. A non-reciprocal antenna, characterized in that: The invention comprises two polarization deflection wave plates, a circularly polarized non-reciprocal radome and a basic antenna, wherein the circularly polarized non-reciprocal radome is located between the two polarization deflection wave plates, and the basic antenna is arranged on one of the polarization deflection wave plates; the polarization deflection wave plate comprises a hollow first dielectric plate, a first surface and a second surface of the first dielectric plate are both provided with a plurality of gratings, and a plurality of metal bent strips are arranged between each adjacent two gratings; the two polarization deflection wave plates are respectively a first polarization deflection wave plate and a second polarization deflection wave plate; the first surface and the second surface of the circularly polarized non-reciprocal radome are respectively provided with a plurality of metal bent strips; A plurality of magnets are respectively arranged on the circularly polarized non-reciprocal antenna cover; the first surface of the circularly polarized non-reciprocal antenna cover is opposite to the second surface of the first polarization deflection wave plate, and the second surface of the circularly polarized non-reciprocal antenna cover is opposite to the first surface of the second polarization deflection wave plate; all the magnets on the first surface of the circularly polarized non-reciprocal antenna cover correspond one-to-one in position to all the metal bent strips on the second surface of the first polarization deflection wave plate, and all the magnets on the second surface of the circularly polarized non-reciprocal antenna cover correspond one-to-one in position to all the metal bent strips on the first surface of the second polarization deflection wave plate.

2. The non-reciprocal antenna according to claim 1, characterized in that: The arrangement direction of the gratings on the first surface on the first surface and the arrangement direction of the gratings on the second surface on the second surface are perpendicular to each other.

3. The non-reciprocal antenna according to claim 1, characterized in that: The circularly polarized non-reciprocal radome comprises at least two dielectric plates, and a ferrite material plate is arranged between two adjacent dielectric plates; copper sheets are respectively arranged at positions corresponding to the magnets on each outermost dielectric plate of the circularly polarized non-reciprocal radome.

4. The non-reciprocal antenna according to claim 3, characterized in that: The magnet is a cylindrical structure, and the bottom surface of the cylinder and the surface of the copper sheet have the same shape and size.

5. The non-reciprocal antenna according to any one of claims 1 to 4, characterized in that: The relative dielectric constant of each dielectric plate is 2.2 and the loss tangent is 0.

001.

6. The non-reciprocal antenna according to claim 3, characterized in that: The relative dielectric constant of the ferrite material plate is 14.5, the magnetization saturation is 1800 Gauss, and the thickness is 0.5 mm.

7. The non-reciprocal antenna according to claim 3, characterized in that: The radius of the magnet is 2.2 mm.

8. The non-reciprocal antenna according to claim 3, characterized in that: The thickness of the copper sheet is 0.035 mm.

Images