A radome

Abstract

The present invention discloses an antenna cover, which is a cover body surrounded by a plurality of unit structures, each of which includes: a square ring resonator arranged on the upper surface of a dielectric substrate, a four-opening resonator arranged on the lower surface of a dielectric partition, and an open circular ring resonator arranged between the dielectric partition and the dielectric top plate; the centers of the square ring resonator, the four-opening resonator and the open circular ring resonator are on the same axis to achieve circular polarization excitation; the square ring resonator and the open circular ring resonator can be coupled to each other, the material of the four-opening resonator is vanadium dioxide, and the four-opening resonator can change the coupling phase between the square ring resonator and the open circular ring resonator when the vanadium dioxide undergoes a phase change. The antenna cover provided by the present invention can effectively provide physical and electromagnetic protection for the antenna, achieve circular polarization excitation, can accept waves of various polarization directions, has good anti-interference performance, and can effectively improve the accuracy of the antenna in sending and receiving information.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic communication equipment, and in particular to a radome. Background Art

[0002] At present, the main function of traditional antenna covers is to protect the antenna system from the influence of wind, rain, snow, dust and solar radiation, and reduce the physical protection functions of the antenna system, such as wear, corrosion and aging. It cannot meet the current rapid development of wireless communication technology, satellite communication and navigation, radar systems and military electronic countermeasures equipment, which has higher requirements for information accuracy, directionality and anti-interference performance. The traditional antenna covers have low functional integration, weak resistance to electromagnetic interference, large losses, and can easily affect the electrical performance of the antenna and reduce the accuracy of receiving and sending signals. Summary of the invention

[0003] The purpose of the present invention is to provide a radome that overcomes the deficiencies in the prior art, and while playing a traditional protective role, realizes a circular polarization mode that can better receive and send signals, and has functions such as anti-electromagnetic interference, low loss, filtering, and adjustability, thereby reducing the impact on antenna performance.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0005] The present invention provides an antenna cover, which is a cover body surrounded by a plurality of unit structures, each of which comprises: a square ring resonator arranged on the upper surface of a dielectric substrate, a four-opening resonator arranged on the lower surface of a dielectric partition, and an open circular ring resonator arranged between the dielectric partition and the dielectric top plate; the centers of the square ring resonator, the four-opening resonator and the open circular ring resonator are on the same axis to realize circular polarization excitation;

[0006] The square ring resonator and the open circular ring resonator can be coupled to each other. The material of the four open resonators is vanadium dioxide. The four open resonators can change the coupling phase between the square ring resonator and the open circular ring resonator when the vanadium dioxide undergoes a phase change.

[0007] Preferably, the dielectric substrate and the dielectric partition are separated by a support member to separate the square ring resonator and the open circular ring resonator from each other, and the spacing distance between the square ring resonator and the open circular ring resonator is 3 μm.

[0008] Preferably, the support member comprises four support cylinders with the same structure, and the four support cylinders are evenly supported at four corners between the dielectric substrate and the dielectric partition.

[0009] Preferably, the four-open resonator comprises four open square ring resonators with the same structure, and the four open square ring resonators are interconnected to form a field-shaped structure with the opening direction rotating 90° clockwise.

[0010] Preferably, the open circular ring resonator is a circular ring structure with four identical openings, and the four openings of the open circular ring resonator are distributed symmetrically with respect to each other.

[0011] Preferably, the materials of the square ring resonator and the open circular ring resonator are both gold or aluminum; the material of the dielectric substrate is silicon with a dielectric constant of 11.9 and a loss tangent of 0.0025; the materials of the dielectric partition, dielectric top plate and support are all polytetrafluoroethylene with a dielectric constant of 2.65 and a loss tangent of 0.001.

[0012] Preferably, when the vanadium dioxide of the four-opening resonator is in a dielectric state, the electrical conductivity is 10 S / m; when the vanadium dioxide is in a metallic state, the corresponding electrical conductivity is 3× 10 5 S / m; the critical temperature of the vanadium dioxide changing from a dielectric state to a metallic state is 68°C.

[0013] Preferably, when the vanadium dioxide changes from a dielectric state to a metallic state, the coupling phase between the square ring resonator and the open circular ring resonator shifts.

[0014] Preferably, the thickness of the square ring resonator and the open circular ring resonator are both 0.2 μm; the thickness of the four-open resonator is 5 μm.

[0015] Preferably, the thickness of the dielectric substrate and the dielectric top plate is 10 μm; the thickness of the dielectric partition is 9 μm.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] The centers of the square ring resonator, the four-opening resonator and the open circular ring resonator of the present invention are on the same axis and the structure is highly symmetrical, which can excite circular polarization, has direction insensitivity, can receive waves of various polarization directions, and effectively reduce losses; the phase change characteristics of the vanadium dioxide material in the four-opening resonator are fully utilized to change the coupling phase between the square ring resonator and the open circular ring resonator, realize the conversion between electromagnetic induced transparency and electromagnetic induced absorption, and form a high-transmittance or high-absorption window, so that the group velocity can be reduced, and the slow light effect and group delay are better, so as to realize electromagnetic protection, effectively improve the accuracy of sending and receiving information, and have strong anti-electromagnetic interference ability, higher filtering characteristics, and more flexible size selection; the present invention has a simple structure, easy-to-obtain materials, low cost, and diverse functions, and is also conducive to integration into other systems and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the components of the unit structure of the antenna cover in an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a square ring resonator in an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a four-port resonator in an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of an open ring resonator in an embodiment of the present invention;

[0022] Figure 5 is the transmission curve of vanadium dioxide in a medium state in an embodiment of the present invention;

[0023] Figure 6 is the absorption curve of vanadium dioxide in a metallic state in an embodiment of the present invention;

[0024] In the figure: 1, square ring resonator; 2, four-open resonator; 21, open square ring resonator; 3, open circular ring resonator; 4, dielectric substrate; 5, dielectric partition; 6, dielectric top plate; 7, support member; 71, supporting cylinder. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0028] like Figure 1 As shown, it is a schematic diagram of the structure of each component of the unit structure of the antenna cover provided in an embodiment of the present invention, wherein the centers of the components of the unit structure are all on the same axis, and from bottom to top are: a dielectric substrate 4, a square ring resonator 1, a support 7, a four-opening resonator 2, a dielectric partition 5, an open circular ring resonator 3, and a dielectric top plate 6; specifically, the square ring resonator 1 is fixed on the upper surface of the dielectric substrate 4, the four-opening resonator 2 is fixed on the lower surface of the dielectric partition 5, and the open circular ring resonator 3 is fixed between the dielectric partition 5 and the dielectric top plate 6; the dielectric substrate 4 and the dielectric partition 5 are connected by The square ring resonator 1 and the open circular ring resonator 3 are separated by a support member 7, so that the square ring resonator 1 and the open circular ring resonator 3 are separated from each other, air is filled between the square ring resonator 1 and the open circular ring resonator 3, and the spacing distance between the square ring resonator 1 and the open circular ring resonator 3 is 3μm; wherein, the support member 7 in the embodiment of the present invention is four support cylinders 71 with the same structure, and the four support cylinders 71 are evenly supported at the four corners between the dielectric substrate 3 and the dielectric partition 4; it should be noted that the selection of the support member 7 is not limited to 4 support cylinders 71, and other structures with different numbers and shapes can also be selected according to actual conditions.

[0029] As an embodiment of the present invention, the length and width of the dielectric substrate 4, the dielectric partition 5 and the dielectric top plate 6 are all set to 150 μm, and the thicknesses are 10 μm, 9 μm and 10 μm respectively; the thicknesses of the square ring resonator 1 and the open circular ring resonator 3 are both 0.2 μm, and the thickness of the four-open resonator 2 is 5 μm; the radius of the supporting cylinder 71 is r=5 μm, and the height is h4=8.2 μm; specifically, as Figure 2 As shown, the outer side length a of the square ring resonator 1 is 100 μm, and the difference in the inner and outer ring lengths of the square ring resonator 1 is w2=5 μm; Figure 3 As shown, the four-open resonator 2 in the embodiment of the present invention comprises four open square ring resonators 21 with the same structure, and the four open square ring resonators (21) are connected to each other to form a field-shaped structure with an opening direction rotating 90° clockwise; wherein the side length of the open square ring resonator 21 is b=60μm, the opening width of the open square ring resonator 21 is g=10μm, and the difference between the inner and outer side lengths of the open square ring resonator 21 is w1=10μm; as shown Figure 4As shown, the open circular ring resonator 3 in the embodiment of the present invention is a circular ring structure with four identical openings, and the four openings of the open circular ring resonator 3 are symmetrically distributed with respect to each other; the opening width of the open circular ring resonator 3 is g1=10μm, and the outer radius r1=73μm and the inner radius r2=63μm of the open circular ring resonator 3; the unit structure of the antenna cover provided in the embodiment of the present invention has highly symmetrical structures of its components, is directionally insensitive, can accept waves in various polarization directions, has good circular polarization performance, can better receive or transmit signals, and effectively reduces losses.

[0030] In the antenna cover provided in the embodiment of the present invention, the material of the square ring resonator 1 and the open circular ring resonator 3 is preferably gold, and silver, copper or aluminum, or an alloy containing gold, silver, copper or aluminum can also be selected according to needs; the material of the dielectric substrate 4 is silicon with a dielectric constant of 11.9 and a loss tangent of 0.0025; the material of the dielectric partition 5, the dielectric top plate 6 and the support member 7 are all polytetrafluoroethylene with a dielectric constant of 2.65 and a loss tangent of 0.001; in addition, the material of the four-open resonator 2 in the embodiment of the present invention is vanadium dioxide, and the four-open resonator 2 can change the coupling phase between the square ring resonator 1 and the open circular ring resonator 3 when the vanadium dioxide undergoes a phase change; when the vanadium dioxide is in a dielectric state, the conductivity is 10S / m; when the vanadium dioxide is in a metallic state, the corresponding conductivity is 3× 10 5 S / m; among them, the critical temperature of vanadium dioxide changing from a dielectric state to a metallic state is 68°C.

[0031] As an embodiment of the present invention, in order to adjust the characteristics of the vanadium dioxide phase change material, a heating resistor wire or a packaged electric heating film can be laid on the periphery of the structure of the antenna cover provided in the embodiment of the present invention, and the temperature can be controlled by an external power supply. The vanadium dioxide material can achieve a jump in conductivity at 68°C, and change from the original dielectric state to the metallic state; specifically, at room temperature, the vanadium dioxide is in a dielectric state, that is, the conductivity is 10s / m. With the excitation of the incident electromagnetic field, the square ring resonator 1 and the open circular ring resonator 3 each form resonance and couple with each other, which can realize the coherent decomposition of the incident wave, forming an electromagnetic induced transparency phenomenon (Electromagnetic induced transparency), and forming a high transmission window in a specific band, such as Figure 5 As shown, the transmission range is 0.458THz to 0.910THz, the maximum transmission can reach 89.7%, and it has group delay and slow light effects, which can improve the anti-interference ability of the antenna cover; in addition, the high transmission window can filter out signals in other frequency bands and can also act as a filter; in addition, when the temperature is above 68°C, vanadium dioxide is in a metallic state, and the coupling phase shift between the square ring resonator 1 and the open circular ring resonator 3 is offset, realizing the coherent phase construction of the incident wave, that is, the electromagnetic induced absorption phenomenon, as shown in Figure 6 As shown, the transmission window between 0.458 THz and 0.910 THz becomes a high absorption peak, transforming from electromagnetically induced transparency to electromagnetically induced absorption; the antenna cover provided in the embodiment of the present invention can achieve the functional transformation of high transmission and low absorption and high absorption and low transmission, so that it can be applied to different antenna cover protection scenarios.

[0032] To sum up, the antenna cover provided in the embodiment of the present invention, in addition to its own suppression of rain and fog interference, has good filtering performance, and can achieve high transmittance or high absorption in a fixed frequency band; in addition, it has good circular polarization performance, can receive incoming waves of any polarization, and the radiated waves passing through the antenna cover in the embodiment of the present invention can also be received by terminal devices of any polarization form, and has strong electromagnetic anti-interference ability, can improve the accuracy of received and sent information, effectively reduce the power consumption of the protected antenna, and have higher radiation efficiency; at the same time, the phase change characteristics of vanadium dioxide are utilized to realize the transmission and absorption characteristics of the antenna cover, and effective functional transformation can be performed according to the required conditions; the present invention has more flexible size selection, higher absorption rate, lower loss, and effective physical and electromagnetic protection of the antenna. It has a simple structure, easy-to-obtain materials, low cost, and a wide range of applications. It has the ability to suppress rain and fog interference and improve resistance to multipath effects in mobile communications, global positioning systems, radars and other systems.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A radome, characterized in that: The antenna cover is a cover body surrounded by a plurality of unit structures, each of the unit structures comprising: a square ring resonator (1) arranged on the upper surface of a dielectric substrate (4), a four-opening resonator (2) arranged on the lower surface of a dielectric partition (5), and an open circular ring resonator (3) arranged between the dielectric partition (5) and the dielectric top plate (6); the centers of the square ring resonator (1), the four-opening resonator (2) and the open circular ring resonator (3) are on the same axis to achieve circular polarization excitation; The square ring resonator (1) and the open circular ring resonator (3) can be coupled to each other, the material of the four-open resonator (2) is vanadium dioxide, and the four-open resonator (2) can change the coupling phase between the square ring resonator (1) and the open circular ring resonator (3) when the vanadium dioxide undergoes a phase change.

2. The radome according to claim 1, characterized in that: The dielectric substrate (4) and the dielectric partition (5) are separated by a support member (7) so as to separate the square ring resonator (1) and the open circular ring resonator (3) from each other, and the spacing distance between the square ring resonator (1) and the open circular ring resonator (3) is 3 μm.

3. The radome according to claim 2, characterized in that: The support member (7) comprises four support cylinders (71) of the same structure, and the four support cylinders (71) are evenly supported at four corners between the dielectric substrate (3) and the dielectric partition (4).

4. The radome according to claim 1, characterized in that: The four-open resonator (2) comprises four open square ring resonators (21) of the same structure, and the four open square ring resonators (21) are connected to each other to form a field-shaped structure with the opening direction rotating 90 degrees clockwise.

5. The radome according to claim 1, characterized in that: The open circular ring resonator (3) is a circular ring structure having four identical openings, and the four openings of the open circular ring resonator (3) are distributed symmetrically with respect to each other.

6. The radome according to any one of claims 1 to 5, characterized in that: The materials of the square ring resonator (1) and the open circular ring resonator (3) are both gold or aluminum; the material of the dielectric substrate (4) is silicon with a dielectric constant of 11.9 and a loss tangent of 0.0025; the materials of the dielectric partition plate (5), the dielectric top plate (6) and the support member (7) are all polytetrafluoroethylene with a dielectric constant of 2.65 and a loss tangent of 0.

001.

7. The radome according to claim 6, characterized in that: When the vanadium dioxide of the four-opening resonator (2) is in a dielectric state, the electrical conductivity is 10 S / m; when the vanadium dioxide is in a metallic state, the corresponding electrical conductivity is 3× 10 5 S / m; the critical temperature of the vanadium dioxide changing from a dielectric state to a metallic state is 68°C.

8. The radome according to claim 7, characterized in that: When the vanadium dioxide changes from a dielectric state to a metallic state, the coupling phase between the square ring resonator (1) and the open circular ring resonator (3) shifts.

9. The radome according to claim 1 or 7, characterized in that: The thickness of the square ring resonator (1) and the open circular ring resonator (3) are both 0.2 μm; the thickness of the four-open resonator (2) is 5 μm.

10. The radome according to claim 9, characterized in that The thickness of the dielectric substrate (4) and the dielectric top plate (6) are both 10 μm; the thickness of the dielectric partition (5) is 9 μm.

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