Non-magnetic passive space nonreciprocal antenna housing based on artificial electromagnetic metamaterial

Abstract

The invention discloses a non-magnetic passive space nonreciprocal antenna housing based on an artificial electromagnetic metamaterial, and relates to the technical field of stealth materials, the non-magnetic passive space nonreciprocal antenna housing comprises antenna housing units which are periodically spliced in a plane, and each antenna housing unit comprises two dielectric substrates which are vertically crossed with each other; artificial microstructure units are arranged on the upper surface and the lower surface of the dielectric substrate; wherein the artificial microstructure unit arranged on the upper surface of the dielectric substrate comprises a double-opening SRR ring, the artificial microstructure unit arranged on the lower surface of the dielectric substrate comprises an asymmetric square opening ring, and the centers of the double-opening SRR ring and the asymmetric square opening ring are asymmetric. The technical problems that in the prior art, a non-reciprocal super-electromagnetic surface needs external magnetic bias or an external power source, preparation is complex, and integration is difficult are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of invisibility materials, in particular to a non-magnetic and passive space non-reciprocal antenna cover based on artificial electromagnetic super material. BACKGROUND

[0002] Artificial electromagnetic super material is a kind of micro-structure unit that can realize super-normal electromagnetic characteristics through artificial design, which can break through the physical limit of natural materials and flexibly control the propagation mode of electromagnetic waves. In recent years, because it can flexibly control the incidence and absorption of electromagnetic waves of a specific frequency, it has been widely used in the field of invisibility materials to protect equipment from being detected by enemy radars. For decades, researchers have successively proposed wave-absorbing super surface, wave-absorbing and wave-transmitting integrated super surface and coded super surface to realize electromagnetic invisibility.

[0003] However, the traditional electromagnetic super surface is easily limited by the Lorentz reciprocity theorem, which greatly limits its application in the increasingly complex and variable electromagnetic environment. Breaking the transmission symmetry has become a crucial task, and non-reciprocal super surface has attracted more and more interest from researchers, which can manipulate electromagnetic waves in a one-way manner to realize non-reciprocal wave absorption, non-reciprocal polarization conversion and non-reciprocal frequency conversion, etc., bringing greater freedom to the design of super surface. Researchers have achieved non-reciprocal transmission by loading ferrite materials and various nonlinear devices on the reciprocal electromagnetic super surface. However, the electromagnetic super surface designed in this way inevitably has the disadvantages of complex and expensive preparation, large size and difficulty in integration, which does not match the modern lightweight and compact integrated circuit array. SUMMARY

[0004] In order to solve the above technical problems existing in the prior art, the present application provides a non-magnetic and passive space non-reciprocal antenna cover based on artificial electromagnetic super material. The technical solution is as follows: On the one hand, a non-magnetic and passive space non-reciprocal antenna cover based on artificial electromagnetic super material is provided, which includes antenna cover units periodically spliced in a plane, the antenna cover units include two mutually perpendicular and intersecting dielectric substrates; the upper surface and the lower surface of the dielectric substrate are provided with artificial micro-structure units; wherein the artificial micro-structure units provided on the upper surface of the dielectric substrate include double-open SRR rings, and the artificial micro-structure units provided on the lower surface of the dielectric substrate include asymmetric square open rings, the centers of the double-open SRR rings and the asymmetric square open rings are asymmetric.

[0005] Optionally, the two mutually perpendicular and intersecting dielectric substrates form a cross-shaped structure at the top.

[0006] Optionally, the material of the artificial micro-structure unit includes metal or ideal electrical conductor.

[0007] Optionally, the material of the dielectric substrate includes FR-4.

[0008] Optionally, the double-open SRR ring has a structure of a Chinese character 'Ri' with upper and lower slots, and the asymmetric square open ring has a structure of a Chinese character 'Kou' with left and right slots.

[0009] Optionally, the line width of the artificial micro-structure unit is 0.8 mm.

[0010] Optionally, the length of the dielectric substrate is one-eighth of the wavelength corresponding to the center operating frequency, and the width of the dielectric substrate is one-tenth of the wavelength corresponding to the center operating frequency.

[0011] Optionally, the thickness of the dielectric substrate is 0.2 mm - 0.6 mm.

[0012] Optionally, at least one through hole is provided on the dielectric substrate, a metal ring is provided in the through hole, and the metal ring connects the artificial micro-structure units on the upper surface of the dielectric substrate and the artificial micro-structure units on the lower surface of the dielectric substrate.

[0013] Optionally, the arrangement method of the through holes includes any one of the following: four through holes are respectively provided on each dielectric substrate, two through holes are respectively provided on each dielectric substrate, and only one through hole is provided on only one of the two dielectric substrates.

[0014] The embodiment of the present invention provides a magnetic-free and passive space non-reciprocal radome based on artificial electromagnetic metamaterials. Instead of introducing active devices, different structures of mutually perpendicular metamaterial units are artificially constructed on mutually perpendicular dielectric substrates, and the space-time parity characteristics of the structure are destroyed by adopting a central asymmetric arrangement method, so that the radome of this structure processes electromagnetic waves incident from different angles differently, generating spatial non-reciprocal characteristics. In addition, by loading metal posts at different positions between the dielectric substrates, the radome has multiple different operating modes, effectively alleviating the problem that the non-reciprocity of the superstructure can only be achieved by loading non-linear devices before, and improving the utilization rate of the radome; the present invention has the advantages of simple structure, strong functionality, strong scalability, and wide application range. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0016] Figure 1 It is a schematic structural diagram of a radome unit provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of an artificial microstructure unit disposed on the upper surface of a dielectric substrate according to an embodiment of the present invention; Figure 3 This is a schematic diagram of an artificial microstructure unit disposed on the lower surface of a dielectric substrate according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials with oblique incidence at θ=30°, provided by an embodiment of the present invention. Figure 5 This is a schematic diagram of the curves showing the changes of S21 and S12, which are obliquely incident at θ=30°, as the opening slot of the asymmetric square opening ring on the back of the dielectric substrate moves up and down, according to an embodiment of the present invention. Figure 6 This is a schematic diagram showing the curves of the S21 and S12 of a non-magnetic, passive, spatial non-reciprocal radome based on artificial electromagnetic metamaterials, which are obliquely incident at θ=30°, as the opening slots of the double-opening SRR ring on the front side of the dielectric substrate move left and right, and the opening slots of the asymmetrical square opening ring on the back side move up and down. Figure 7 This is a schematic diagram of a structure for loading eight metal through holes on a non-magnetic, passive, spatial non-reciprocal radome provided by an embodiment of the present invention; Figure 8 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome with eight metal through holes, incident at an oblique angle of θ=30°, provided by an embodiment of the present invention. Figure 9 This is a schematic diagram of a structure with four metal through holes loaded on a non-magnetic, passive, spatial non-reciprocal radome provided by an embodiment of the present invention; Figure 10 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome with four metal through holes, incident at an oblique angle of θ=30°, provided by an embodiment of the present invention. Figure 11 This is a schematic diagram of a structure for loading a metal through hole on a non-magnetic, passive, spatial non-reciprocal radome provided by an embodiment of the present invention; Figure 12 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome with a metal through-hole loaded with a metal through-hole, incident at an oblique angle of θ=30°, according to an embodiment of the present invention. Figure 13 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials with oblique incidence at θ=10°, provided by an embodiment of the present invention. Figure 14This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials with oblique incidence at θ=30°, provided by an embodiment of the present invention. Figure 15 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials with oblique incidence at θ=60°, provided by an embodiment of the present invention. Detailed Implementation

[0017] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0018] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0019] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0020] This invention provides a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials, comprising radome units periodically spliced ​​in a plane. Figure 1 This is a structural schematic diagram of an antenna radome unit provided according to an embodiment of the present invention. Figure 1 As shown, the radome unit includes two dielectric substrates 1 that intersect each other perpendicularly; artificial microstructure units 2 are provided on the upper and lower surfaces of the dielectric substrates 1.

[0021] Specifically, the tops of the two perpendicularly intersecting dielectric substrates 1 form a cross-shaped structure.

[0022] Figure 2 This is a schematic diagram of an artificial microstructure unit disposed on the upper surface of a dielectric substrate according to an embodiment of the present invention. Figure 3 This is a schematic diagram of an artificial microstructure unit disposed on the lower surface of a dielectric substrate according to an embodiment of the present invention. Figure 2 and Figure 3 As shown, the artificial microstructure unit 2 disposed on the upper surface of the dielectric substrate 1 includes a double-opening SRR ring, and the artificial microstructure unit 2 disposed on the lower surface of the dielectric substrate 1 includes an asymmetrical square-opening ring. The centers of the double-opening SRR ring and the asymmetrical square-opening ring are asymmetrical.

[0023] Among them, the SRR ring is an open-loop resonator (Split Ring Resonator), which is an artificial structural element widely used in electromagnetics and microwave technology. It has a ring design and one or more openings, and can generate strong electromagnetic resonance at a specific frequency.

[0024] Preferably, such as Figure 2 The double-opening SRR ring has a slotted, H-shaped structure. Specifically, the double-opening SRR ring is composed of H-shaped artificial microstructure units with two slots in the center in the vertical direction, and the double-opening SRR ring is attached to the upper surface of the dielectric substrate 1 in the center.

[0025] Preferably, such as Figure 3 As shown, the asymmetrical square open ring is a U-shaped structure with slots on both sides. Specifically, the asymmetrical square open ring is composed of U-shaped artificial microstructure units with two slots in the horizontal direction. One slot is located in the center of the dielectric substrate 1, and the other slot is asymmetrical to it. The entire open ring structure is attached to the lower surface of the dielectric substrate 1, and the upper part of the asymmetrical square open ring is flush with the upper part of the dielectric substrate 1.

[0026] Preferably, the material of the artificial microstructure unit 2 includes metal or an ideal electrical conductor.

[0027] For example, both the double-opening SRR ring and the asymmetrical square-opening ring are made of copper.

[0028] Preferably, the dielectric substrate 1 is made of FR-4. FR-4, short for Flame Retardant 4, is a glass fiber reinforced epoxy resin laminate material.

[0029] Preferably, the line width of the artificial microstructure unit 2 is 0.8 mm.

[0030] Preferably, the length of the dielectric substrate 1 is one-eighth of the wavelength corresponding to the center operating frequency, the width of the dielectric substrate 1 is one-tenth of the wavelength corresponding to the center operating frequency, and the thickness of the dielectric substrate 1 is 0.2mm-0.6mm.

[0031] For example, when the center operating frequency of the radome is 2.5 GHz, according to the speed of light formula c = λf, that is, 3 10 8 m / s=λ 2.5 10 9Based on the wavelength (Hz), the corresponding wavelength for the center operating frequency can be calculated to be 120mm. Therefore, the length of the dielectric substrate 1 is set to 15mm, which is one-eighth of the wavelength, and the width is set to 12mm, which is one-tenth of the wavelength. The same settings are applied to other center operating frequencies. This setting allows the radome structure provided by this invention to be scaled up or down proportionally, thereby shifting the center operating frequency to other frequency bands.

[0032] Figure 4 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome based on an artificial electromagnetic metamaterial, according to an embodiment of the present invention, with oblique incidence at θ=30°. Figure 4 As shown, the radome provided in this embodiment of the invention exhibits obvious non-reciprocal characteristics at frequencies f1, f2, and f3, where S12 ≠ S21. That is, the non-reciprocal radome provided in this embodiment of the invention achieves non-reciprocal effects in three frequency bands, and the non-reciprocal frequency band is between 1.5 GHz and 3.5 GHz.

[0033] Figure 5 This is a schematic diagram illustrating the changes in S21 and S12 of a non-magnetic, passive spatial non-reciprocal radome based on an artificial electromagnetic metamaterial, incident at an angle of θ=30°, as the slots of an asymmetric square opening ring on the back side of a dielectric substrate move up and down. In this case, the opening slot at the exact center of the asymmetric square opening ring remains stationary, and the up and down movement of the other opening slot is controlled by defining a variable w5. When w5 equals 0, the position of the opening slot is... Figure 3 The code indicates that when W5 is greater than 0, the slot moves upward; conversely, when W5 is negative, the slot moves downward. For example... Figure 5 As shown, by changing the variable W5, the non-reciprocal frequency band f1 can remain unchanged, while the non-reciprocal frequency bands f2 and f3 can be adjusted to move.

[0034] Figure 6 This is a schematic diagram illustrating the curves showing the changes in the opening slots of a non-magnetic, passive spatial non-reciprocal radome based on an artificial electromagnetic metamaterial, with an oblique incidence of θ=30°, for S21 and S12, as the opening slots of the double-opening SRR ring on the front side of the dielectric substrate move left and right, and the opening slots of the asymmetrical square opening ring on the back side move up and down. In this case, a variable W8 is added to control the two opening slots of the double-opening SRR ring to move left and right together. When W8 equals 0, the positions of the two opening slots are... Figure 2 The diagram shows that when W8 is greater than 0, both slots move to the right simultaneously; conversely, when W8 is negative, both slots move to the left simultaneously. Figure 6As shown, by adjusting variables W5 and W8 in combination, the non-reciprocal frequency band f2 can be kept stationary while the non-reciprocal frequency bands f1 and f3 can be moved. Therefore, all three non-reciprocal frequency bands of the radome can be flexibly controlled, greatly expanding the flexibility of the structure and its application range.

[0035] In an optional embodiment of the present invention, at least one through hole 3 is provided on the dielectric substrate 1, and a metal ring is provided in the through hole 3. The metal ring connects the artificial microstructure unit 2 on the upper surface of the dielectric substrate 1 and the artificial microstructure unit 2 on the lower surface of the dielectric substrate 1.

[0036] Optionally, the vias 3 can be configured in any of the following ways: four vias 3 are provided on each dielectric substrate 1, two vias 3 are provided on each dielectric substrate 1, or only one of the two dielectric substrates 1 has one via 3.

[0037] Figure 7 This is a schematic diagram of a structure for loading eight metal through holes on a non-magnetic, passive, spatial non-reciprocal radome according to an embodiment of the present invention. Figure 7 As shown, eight through holes are located in the middle of each open ring of the double-opening SRR ring, passing through the dielectric substrate to connect the metal rings on the upper and lower surfaces.

[0038] Figure 8 This is a schematic diagram of the full-wave electromagnetic simulation results of a non-magnetic, passive spatial non-reciprocal radome with eight metal through-holes, as provided in an embodiment of the present invention, with oblique incidence at θ=30°. Due to the connection of the metal through-holes, the resonance between the square rings disappears, and the non-reciprocal characteristics exhibited by the radome also disappear. Figure 8 As shown, when electromagnetic waves are incident at 0-5 GHz, S12=S21, and the radome exhibits low-pass characteristics, which is beneficial for signal transmission.

[0039] Figure 9 This is a schematic diagram of a structure for loading four metal through holes on a non-magnetic, passive, spatial non-reciprocal radome according to an embodiment of the present invention. Figure 9 As shown, comparison Figure 8 Remove the four metal through holes on the top and left sides, that is, set two through holes on one side of each dielectric substrate 1.

[0040] Figure 10 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome with four metal through holes, as provided in an embodiment of the present invention, with oblique incidence at θ=30°. Figure 10 As shown, when electromagnetic waves are incident, the non-reciprocal frequency bands of the radome are reduced from three to two.

[0041] Figure 11This is a schematic diagram of a structure for loading a metal through-hole onto a non-magnetic, passive, spatial non-reciprocal radome according to an embodiment of the present invention. Figure 11 As shown, only one metal through hole is retained on the edge of the opening groove of the asymmetrical square opening ring.

[0042] Figure 12 This is a schematic diagram of the full-wave electromagnetic simulation results curve of a non-magnetic, passive spatial non-reciprocal radome with a metal through-hole, as provided in an embodiment of the present invention, with oblique incidence at θ=30°. Figure 12 As shown, when electromagnetic waves are incident, the radome still has two non-reciprocal frequency bands, f1 and f2, but at frequency point f3, S12=S21, and the non-reciprocal characteristics of the radome are lost.

[0043] Figure 13 , Figure 14 and Figure 15 This is a schematic diagram of the full-wave electromagnetic simulation results curves of a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials, provided in an embodiment of the present invention, with oblique incidence at θ=10°, 30°, and 60° respectively. Figures 13-15 As shown, when electromagnetic waves are incident at angles of 10°, 30°, and 60° respectively, the S-parameters of the radome remain basically unchanged, and it still has three non-reciprocal frequency bands, indicating that the radome has good angular stability and features a wide operating range and high flexibility.

[0044] Depend on Figures 7-15 As can be seen, the non-reciprocal radome provided in this embodiment of the invention further optimizes the structure by adding metal through-holes to the radome, realizing the switching between three different operating modes: wave transmission, two non-reciprocal frequency bands, and shielding the non-reciprocal characteristics of a third non-reciprocal frequency band. It also exhibits good angular stability. The non-reciprocal radome provided in this embodiment of the invention can not only be used as a radome to adjust the antenna's transmit and receive operations, but its multi-band non-reciprocity also enables simultaneous transmit and receive isolation in multiple frequency bands commonly used in satellite communication (such as S, Ku, and Ka bands), significantly simplifying the system architecture and reducing the number, size, and weight of antennas. Multi-band tunability can adapt to the communication frequency band requirements of different mission phases (such as low Earth orbit, transfer orbit, and deep space) or different targets (different satellites / ground stations), dynamically adjusting the non-reciprocal frequency bands to achieve software-defined communication payloads, offering extremely high flexibility.

[0045] Specific application scenarios include: next-generation satellite communication and deep space exploration, 6G and future mobile communication networks, and high-end electronic warfare and radar systems.

[0046] As described above, this invention provides a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials. It eliminates the need for magnetic materials such as ferrites and nonlinear active devices like power amplifiers and transistors. By artificially constructing mutually perpendicular metamaterial layers, the spatiotemporal parity of the electromagnetic metamaterial is disrupted, breaking the Lorentz reciprocity theorem and resulting in non-reciprocal properties. Non-reciprocal properties refer to the different modulations produced by the electromagnetic metamaterial when electromagnetic waves are incident from two different ports, causing different transmission and absorption frequencies. This allows the radome to have higher integration and greater freedom in controlling electromagnetic waves.

[0047] Meanwhile, the method for generating the non-reciprocal property of the non-reciprocal radome provided by this invention involves incident electromagnetic waves at certain angles θ from the front and back surfaces of the non-reciprocal radome towards the positive z and negative z directions, respectively. Note that θ is not equal to 0°, and the result obtained by incident electromagnetic waves from the two ports is non-reciprocal. Furthermore, the frequency point generating the non-reciprocity can be flexibly adjusted by moving the double-opening SRR ring on the front side left and right and the opening slots of the asymmetrical square-opening ring on the back side up and down. Moreover, this invention maintains good angular stability even when electromagnetic waves are incident at angles of 10-60°, allowing for flexible adjustment of the incident electromagnetic waves over a wider range.

[0048] Furthermore, this invention can also change the existing working mode by loading metal through holes, introducing multiple different working modes. It has strong flexibility in practical applications, can realize directional control of electromagnetic wave propagation direction, effectively suppress reverse interference and improve energy utilization efficiency, and has significant value in the field of electromagnetic signal isolation and energy protection.

[0049] The present invention provides a non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials, which has the following advantages compared with the prior art: 1. This invention can destroy the spatiotemporal parity of materials by artificially constructing a cross-shaped metamaterial without loading magnetic materials such as ferrite materials or nonlinear active devices such as power amplifiers and transistors. This makes the structure exhibit obvious non-reciprocal characteristics when facing electromagnetic waves incident from different directions. In practical applications, it can achieve directional control of the propagation direction of electromagnetic waves, effectively suppress reverse interference and improve energy utilization efficiency. 2. The radome provided by this invention can achieve non-reciprocal characteristics in three different frequency bands, and the position of the metal ring opening slot of the radome can be moved as needed to move the center frequency point of the three non-reciprocal frequency bands. It has strong flexibility and practicality. At the same time, the performance of this invention remains basically unchanged when the electromagnetic wave is incident at 10-60°, and it has good angular stability. 3. The radome provided by the present invention can also have a variety of different working modes by loading a different number of metal through holes at different positions, which greatly expands the application range of the radome and enables it to cope with complex and ever-changing electromagnetic environments. 4. This invention realizes an ultra-thin, miniaturized, three-band non-reciprocal characteristic, non-reciprocal frequency band mobility, large-angle stability, and non-reciprocal operating mode switchable non-reciprocal spatial non-reciprocal radome design. The product is easy to process and manufacture and has a wide range of applications.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials, characterized in that, It includes radome units periodically spliced in a plane. The radome unit includes two dielectric substrates that cross each other perpendicularly; artificial microstructure units are arranged on both the upper surface and the lower surface of the dielectric substrate; wherein, The artificial microstructure unit arranged on the upper surface of the dielectric substrate includes a double-open SRR ring, and the artificial microstructure unit arranged on the lower surface of the dielectric substrate includes an asymmetric square open ring. The centers of the double-open SRR ring and the asymmetric square open ring are asymmetric.

2. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, The tops of the two dielectric substrates that cross each other perpendicularly form a cross-shaped structure.

3. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, The material of the artificial microstructure unit includes metal or perfect electric conductor.

4. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, The material of the dielectric substrate includes FR-4.

5. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, The double-open SRR ring is a "day" - shaped structure with upper and lower slots, and the asymmetric square open ring is a "mouth" - shaped structure with left and right slots.

6. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, The line width of the artificial microstructure unit is 0.8 mm.

7. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, The length of the dielectric substrate is one-eighth of the wavelength corresponding to the center operating frequency, and the width of the dielectric substrate is one-tenth of the wavelength corresponding to the center operating frequency.

8. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, The thickness of the dielectric substrate is 0.2 mm - 0.6 mm.

9. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 1, characterized in that, At least one through hole is arranged on the dielectric substrate, and a metal ring is arranged in the through hole. The metal ring connects the artificial microstructure unit on the upper surface of the dielectric substrate and the artificial microstructure unit on the lower surface of the dielectric substrate.

10. The non-magnetic, passive spatial non-reciprocal radome based on artificial electromagnetic metamaterials according to claim 9, characterized in that, The setting method of the through hole includes any one of the following: four through holes are respectively arranged on each dielectric substrate, two through holes are respectively arranged on each dielectric substrate, and only one through hole is arranged on only one of the two dielectric substrates.

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