A tunable polarization-encoded radome based on a multi-layer structure

Abstract

The present invention discloses a tunable polarization-encoded antenna cover based on a multi-layer structure, comprising: an electromagnetic coil, a temperature controller, a dielectric layer, and a rotating carrier stage, arranged in sequence from top to bottom; a protective cover, which covers the electromagnetic coil, the temperature controller, the dielectric layer, and covers the carrier stage; a control circuit, which is used to change the intensity and direction of the magnetic field generated by the electromagnetic coil by controlling the current of the electromagnetic coil; a temperature controller, which is used to change the ambient temperature; and a dielectric layer comprising indium antimonide material, which is used to change the cyclotron frequency of the indium antimonide material and thus the dielectric constant of the dielectric layer according to changes in the intensity, direction, and temperature of the ambient magnetic field. Advantages: By adjusting the dielectric constant of the indium antimonide material by adjusting the temperature and magnetic induction intensity, the coded output of the four polarization forms of the electromagnetic wave is achieved; the present invention is integrated and adjustable, and is a high-performance signal selection and protection device.

Description

Technical Field

[0001] The invention relates to a multi-layer structure-based tunable polarization-encoded antenna cover, belonging to the technical field of photon communications. Background Art

[0002] With the development of communication technology, antenna covers are widely used in aerospace, mobile communications, navigation and other fields, and their application is becoming more and more extensive.

[0003] A radome protects the antenna system from external environmental influences and possesses excellent electromagnetic wave penetration properties. This prevents environmental influences and interference on the antenna's operating state, thereby reducing the antenna's operating power, improving its reliability, and ensuring normal operation. Furthermore, the radome's absorption and reflection of high-frequency energy can cause transmission loss, thereby affecting antenna gain.

[0004] The existing radome has the following defects:

[0005] 1. The electromagnetic waves emitted by the antenna are reflected on the surface of the radome and absorbed in the dielectric layer of the radome, resulting in power loss. In addition, the refraction phenomenon in the dielectric layer causes measurement errors.

[0006] 2. The radome is heavy, has a small structure, and has many parts, making it difficult to install as a whole.

[0007] 3. Although the radome has many advantages such as light weight, low cost, and easy integration, there are still many technical bottlenecks.

[0008] 4. Traditional antennas have a single polarization form and cannot be used for coding. They are not suitable for communication in certain specific polarization situations. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a tunable polarization form encodable antenna cover based on a multi-layer structure, which can realize the regulation of the required electromagnetic wave polarization form.

[0010] To solve the above technical problems, the present invention provides a multi-layer structured, tunable, polarization-encoded radome, comprising: an electromagnetic coil, a temperature controller, a dielectric layer, and a rotating rotatable stage, arranged in order from top to bottom; and a protective cover, which covers the electromagnetic coil, temperature controller, and dielectric layer and covers the rotatable stage.

[0011] The control circuit is used to change the intensity and direction of the magnetic field generated by the electromagnetic coil by controlling the current of the electromagnetic coil;

[0012] The temperature controller is used to change the ambient temperature;

[0013] The dielectric layer includes an indium antimonide material, which is used to change the cyclotron frequency of the indium antimonide material and thus change the dielectric constant of the dielectric layer according to changes in the intensity, direction and temperature of the environmental magnetic field.

[0014] Furthermore, the dielectric layer includes: a first dielectric, an indium antimonide material, a first nonlinear material, and a second nonlinear material, and has the following structure:

[0015] First medium-indium antimonide material-first medium-indium antimonide material-first nonlinear material-first medium-indium antimonide material-first medium-indium antimonide material-first medium-indium antimonide material-first medium-indium antimonide material-second nonlinear material-indium antimonide material-first medium-indium antimonide material-first medium-indium antimonide material-first medium-first nonlinear material-indium antimonide material-first medium-indium antimonide material-first medium.

[0016] Furthermore, the thickness of the first medium is (1.52±0.03) μm, the thickness of the indium antimonide material is (3±0.1) μm, the thickness of the first nonlinear material is (13±0.5) μm, and the thickness of the second nonlinear material is (13±0.5) μm.

[0017] Furthermore, the refractive index function of the first nonlinear material and the second nonlinear material with the electric field E is expressed as n F =n1+χ1|E| 2 and n G =n2+χ2|E| 2 , n1 and n2 represent the linear dielectric refractive indices of the first nonlinear material and the second nonlinear material, respectively, and χ1 and χ2 represent the nonlinear coefficients of the first nonlinear material and the second nonlinear material, respectively.

[0018] Furthermore, the object-carrying circular platform is rotated by a micro motor.

[0019] Furthermore, four ports are provided on the wall of the carrier platform, namely a power switch, a data connection port, a control interface, and a power cord interface; the power switch is connected to the power cord interface, and the power cord interface is connected to the power supply. The power switch is used to control the power on and off and thus control the operation of the antenna cover. The data connection port is connected to the computer, and the control interface is connected to the computer.

[0020] Furthermore, the electromagnetic coil includes a magnet and a coil wound around the magnet, the coil is connected to the control circuit, and the temperature controller and the control circuit are connected to the control interface.

[0021] Furthermore, it also includes a signal processor, which is connected to the computer and the antenna respectively, and is used to collect and process antenna signals and feed them back to the computer.

[0022] The beneficial effects achieved by the present invention are:

[0023] 1. The present invention adopts a combination stack of indium antimonide material, ordinary dielectric and nonlinear material as the dielectric layer. At a certain frequency of the signal antenna cover, the temperature and magnetic field are controlled by temperature and electromagnetic coils to realize specific encoding output of four polarization forms of electromagnetic waves, namely linear polarization, left-hand circular polarization, right-hand circular polarization, and elliptical polarization, to achieve information communication.

[0024] 2. The present invention also provides a temperature controller that can adjust the dielectric constant of indium antimonide, thereby achieving encoding of different polarization forms of electromagnetic waves;

[0025] 3. The control circuit and temperature controller of the present invention are connected to a computer via a data connection port and a current controller interface provided on the wall of the loading platform, thereby enabling programming and adjustment of the control circuit and current controller;

[0026] 4. The present invention realizes the integrated design of the signal antenna cover by combining the antenna device and the multi-layer stacked medium;

[0027] 5. The present invention adjusts the dielectric constant of the indium antimonide material by adjusting the temperature and magnetic induction intensity, thereby achieving coded output of four polarization forms of electromagnetic waves. Compared with traditional signal antenna covers, the advantage of the present invention is that the polarization form of electromagnetic waves is coded and output, and electromagnetic waves radiated by specific antennas are received. The present invention is integrated and controllable, and is a high-performance signal selection and protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of a multi-layer tunable polarization-encoded radome structure;

[0029] Figure 2 Schematic diagram of the structure of a tunable polarization-encoding radome;

[0030] Figure 3 A three-dimensional diagram of a multi-layer tunable polarization-encoded radome structure;

[0031] Figure 4 A cross-sectional view of a multi-layer structured tunable polarization-encoding radome;

[0032] Figure 5 A schematic diagram of a coil of a multi-layer structured tunable polarization-encoding antenna cover structure;

[0033] Figure 6 A front view of a multi-layer structured tunable polarization-encoding radome carrier frustum;

[0034] Figure 7is a three-dimensional diagram of the antenna;

[0035] Figure 8 A schematic diagram of dielectric layer stacking of a multi-layer structured tunable polarization-encoded radome;

[0036] Figure 9 The basic working flow diagram of a multi-layer structured tunable polarization-encoded radome;

[0037] Figures 10(a), 10(b), 10(c), and 10(d) show that the polarization modes of the electromagnetic waves are elliptical polarization, right-hand circular polarization, linear polarization, and left-hand circular polarization, respectively. These are the four polarization forms corresponding to the frequency of 5.299 THz and the temperature and magnetic induction intensity encoded in four combinations of 268 K, 274 K, 1.86 T, and 0 T for the multi-layer structure tunable polarization-encoding antenna cover.

[0038] In the figure: 1. Dielectric layer; 2. Temperature controller; 3. Electromagnetic coil; 4. Protective cover; 5. Carrying table; 6. Power switch; 7. Data connection port; 8. Temperature controller interface; 9. Power cord interface; 10. Coil; 11. Magnet; 12. Control circuit; 13. Antenna; 14. Signal processor. DETAILED DESCRIPTION

[0039] 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 solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0040] This embodiment provides a multi-layer structure of tunable polarization coding antenna cover, the structure of which is as follows: Figures 1 to 9 The system comprises a dielectric layer 1, a temperature controller 2, an electromagnetic coil 3, a protective cover 4, a truncated stage 5, an antenna 13, and a control circuit 12. The dielectric layer 1 is a multi-layer dielectric stack composed of a common dielectric, indium antimonide (ISB), and two nonlinear materials. By adjusting the cyclotron frequency of the IAS material and thereby changing its dielectric constant, the polarization of electromagnetic waves at a specific frequency within the signal radome can be controlled.

[0041] like Figure 1 As shown, the present invention discloses a multi-layered, tunable, polarization-encoded radome, comprising a truncated carrier 5 with four ports provided on its wall: a power switch 6, a data connection port 7, a temperature controller port 8, and a power cord port 9. A protective cover 4, an electromagnetic coil 3, and a dielectric layer 1 are provided on the truncated carrier 4.

[0042] The electromagnetic coil 3, as Figure 5 As shown, it is mainly composed of a magnet 11 and an outer winding coil 10, wherein the control circuit 12 regulates the coil current, thereby changing the magnetic field strength and direction to achieve the regulation of the cyclotron frequency of the indium antimonide material.

[0043] The angle of the antenna 13 is adjusted by the object-carrying disc 5, thereby providing the antenna 13 with the conditions for transmitting and receiving signals at a specific angle. The main function of the antenna 13 is to complete signal transmission and reception, while the signal processor 15 completes signal processing. The control circuit 12 and the current controller are implemented through programming. The control circuit controls the object-carrying disc and the electromagnetic coil to change the size and direction of the external magnetic field generated by the electromagnetic coil, completing the adjustment of the antenna's signal transmission and reception angle and the cyclotron frequency of the indium antimonide material. The temperature controller can also adjust the frequency of indium antimonide, thereby affecting its dielectric constant. Therefore, the frequency and cyclotron frequency of the indium antimonide material and the angle of the antenna's signal transmission and reception can be controlled by programming, realizing the related mode modulation of the signal antenna cover at specific temperatures and magnetic induction intensities in four polarization coding forms.

[0044] Figure 8 The dielectric layer comprises a first dielectric, an indium antimonide material, a first nonlinear material, and a second nonlinear material. The dielectric layer is constructed in the form of "first dielectric-indium antimonide material-first dielectric-indium antimonide material-first nonlinear material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-second nonlinear material-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric." The thickness of the first dielectric is 1.52 μm, the thickness of the indium antimonide material is 3 μm, the thickness of the first nonlinear material is 13 μm, and the thickness of the second nonlinear material is 13 μm.

[0045] The refractive index of the first medium The expression of the refractive index function of the first nonlinear material G and the second nonlinear material F with the electric field E is n F =n1+χ1|E| 2 and n G =n2+χ2|E| 2 , n1 and n2 represent the linear dielectric refractive index, χ1 and χ2 are nonlinear coefficients, n1 = 2.72, χ1 = 1 × 10 -13 m 2 / V 2 , n2=1.2,χ2=6.2×10 -12 m 2 / V 2 .

[0046] Figure 9The flowchart of the multi-layer structure of the tunable polarization-encoded antenna cover can be seen from Figure 10 that the computer acts as the core controller to simultaneously regulate the control circuit and the temperature controller, wherein the control circuit changes the size of the external magnetic field generated by the electromagnetic coil by controlling the electromagnetic coil, thereby completing the adjustment of the antenna receiving and transmitting signal angle and the cyclotron frequency of the indium antimonide material, while the current controller can regulate the frequency of the indium antimonide material. Finally, the signal processor 15 feeds back the signal processing information to the computer to complete the signal processing.

[0047] Figures 10(a), 10(b), 10(c), and 10(d) show the adjustment diagrams of four polarization modes of a multi-layer tunable polarization-encoded radome. Figures 10(a), 10(b), 10(c), and 10(d) show the polarization modes of the electromagnetic wave: elliptical polarization, right-hand circular polarization, linear polarization, and left-hand circular polarization, respectively. Linear polarization requires a phase difference of 0° or ±180° between the two polarization modes. Right-hand circular polarization requires a phase difference of 90° between the transverse magnetic polarization and the transverse electric polarization, with the amplitude calculated as an axial ratio within 3dB. Left-hand circular polarization requires a phase difference of -90° between the transverse magnetic polarization (TM) and the transverse electric polarization (TE), with the amplitude calculated as an axial ratio within 3dB. The multi-physics polarization encoder will be further described below. The temperature and magnetic flux density under different conditions are defined as T1, T2, B1, and B2, respectively, where T1 and T2 are 268K and 274K, respectively. T1 is set to logic level "1" and T2 to logic level "0," designated as the first input. Similarly, B1 and B2 are 1.86T and 0T, respectively, listed as logic levels "1" and "0" for the second input. Two different logic inputs can encode four different polarization types: right-hand circular polarization, left-hand circular polarization, linear polarization, and elliptical polarization. As shown in Figure 10(a), since the frequency is 5.299THz, the temperature and magnetic flux density are T1 and B1, the input logic levels are "1" and "1," and the logic code is marked as "11." Figure 10(a) shows a phase difference of 45°, the reflectivity of the two waves is of arbitrary magnitude, and the axial ratio is greater than 3dB. Therefore, when the code is "11," the output coded polarization is elliptical. As shown in Figure 10(b), the temperature is T1, but the magnetic flux density is B2. In this case, the logic code is "10." Furthermore, the phase difference is -270° in the total reflection band, and its axial ratio is far less than 3 dB, indicating right-hand circular polarization. When the logic code is "01," the corresponding temperature and magnetic flux density are T2 and B1. In Figure 10(c), the phase difference is 0°. Furthermore, at 5.299 THz, the reflectivity amplitudes of both waves exceed 0.9, indicating linear polarization. Specifically, when the logic code is "00," the temperature and magnetic flux density are T2 and B2, respectively. Figure 10(d) shows that the phase difference in the TE and TM wave reflection bands at 5.299 THz is -90°. As can be seen from the enlarged view of the region from 5.28 THz to 5.36 THz in Figure 10(d), the axial ratio is far less than 3 dB. Therefore, the output polarization code is left-hand and right-hand circular polarization. To explain this coding state more concisely, the polar codes under different outputs are briefly shown in Table 1. The results show that this coding can be flexibly adjusted.

[0048] Table 1. Logical polar code table. (Actual input performance is shown in parentheses)

[0049]

[0050] Therefore, by adjusting the frequency of indium antimonide and the cyclotron frequency of indium antimonide, we can achieve the encoded output of the four polarization forms of electromagnetic waves by the signal antenna cover, so that the polarization form of the signal can be easily changed to achieve mode modulation of the electromagnetic wave.

[0051] Implementation principle: Indium antimonide material is the product of the intersection of indium antimonide disciplines and photonic crystal disciplines. Compared with general dielectrics, indium antimonide has better tunability in temperature and magnetic induction intensity: when dielectric components are periodically introduced, the modified structure also has tunability. The present invention utilizes the stacking of different dielectric materials to stack magnetized indium antimonide materials, ordinary dielectrics and nonlinear dielectrics, thereby realizing the encoding of the polarization form of electromagnetic waves under specific magnetic induction intensity and temperature changes, and controls the frequency of the indium antimonide material and the cyclotron frequency of the indium antimonide material as well as the angle of the antenna receiving and transmitting signals through computer programming, effectively controlling the dielectric constant of the indium antimonide material at a specific frequency to achieve polarization encoding. At the same time, the shielding function of the signal antenna cover against interference signals is increased, thereby improving its working reliability. Generally, antennas are reversible, that is, the same pair of antennas can be used as both transmitting antennas and receiving antennas. Combined with this structure, multi-angle selective signal transmission and reception can be realized.

[0052] Compared with traditional complex structures, the present invention has unique performance and advantages: (1) Controllability: By programming the frequency of the indium antimonide material, the cyclotron frequency of the indium antimonide material, and the angle at which the antenna transmits and receives signals, the polarization form of the electromagnetic wave can be coded and output, thereby achieving mode modulation of the electromagnetic wave; (2) Multifunctionality: The present invention can achieve mode modulation of signals related to angle and frequency. (3) Integration: The present invention realizes the integrated design of the signal antenna cover by combining the antenna device, the multi-layer stacked medium, and the protective cover device.

[0053] By adjusting the frequency and cyclotron frequency of the indium antimonide material, the present invention can encode the polarization of electromagnetic waves. Compared with traditional signal radomes, this invention has the advantage of being able to transmit and receive signals from multiple angles at a specific operating frequency, while simultaneously shielding signals of different polarization forms and receiving the desired signal.

[0054] 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.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0058] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. Throughout this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A multi-layer structure-based tunable polarization-encoded radome, characterized in that: include: The electromagnetic coil (3), the temperature controller (2), the dielectric layer (1) and the rotating object carrier (5) are sequentially arranged from top to bottom, and further comprises a protective cover (4), which covers the electromagnetic coil (3), the temperature controller (2), the dielectric layer (1) and the object carrier (5); The control circuit (12) is used to change the intensity and direction of the magnetic field generated by the electromagnetic coil (3) by controlling the current of the electromagnetic coil (3); The temperature controller (2) is used to change the ambient temperature; The dielectric layer (1) comprises an indium antimonide material, which is used to change the cyclotron frequency of the indium antimonide material and thus change the dielectric constant of the dielectric layer (1) according to changes in the intensity, direction and temperature of the environmental magnetic field; The dielectric layer (1) comprises: a first dielectric, an indium antimonide material, a first nonlinear material, and a second nonlinear material, and has a structure of: first dielectric-indium antimonide material-first dielectric-indium antimonide material-first nonlinear material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-second nonlinear material-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-indium antimonide material-first dielectric-first nonlinear material-indium antimonide material-first dielectric-indium antimonide material-first dielectric.

2. The multi-layer structure-based tunable polarization-encoded radome according to claim 1, characterized in that: The thickness of the first medium is (1.52±0.03) μm, the thickness of the indium antimonide material is (3±0.1) μm, the thickness of the first nonlinear material is (13±0.5) μm, and the thickness of the second nonlinear material is (13±0.5) μm.

3. The multi-layer structure-based tunable polarization-encoded radome according to claim 1, wherein: The refractive index functions of the first nonlinear material and the second nonlinear material vary with the electric field E The expression is n F = n 1+ χ 1| E | 2 and n G = n 2+ χ 2| E | 2 , n 1. n 2 denotes the linear dielectric refractive index of the first nonlinear material and the second nonlinear material, respectively, χ 1 and χ 2 represent the nonlinear coefficients of the first nonlinear material and the second nonlinear material respectively.

4. The multi-layer structure-based tunable polarization-encoded radome according to claim 1, characterized in that: The object-carrying circular platform is controlled to rotate by a micro motor.

5. The multi-layer structure-based tunable polarization-encoded radome according to claim 1, characterized in that: Four ports are provided on the wall of the object-carrying platform (5), namely a power switch (6), a data connection port (7), a control interface (8), and a power line interface (9); the power switch (6) is connected to the power line interface (9), and the power line interface (9) is connected to the power supply. The power switch (6) is used to control the power supply on and off and thus control the operation of the antenna cover. The data connection port (7) is connected to the computer, and the control interface (8) is connected to the computer.

6. The multi-layer structure-based tunable polarization-encoded radome according to claim 5, characterized in that: The electromagnetic coil (3) comprises a magnet and a coil wound around the magnet, the coil is connected to the control circuit (12), and the temperature controller (2) and the control circuit (12) are connected to the control interface (8).

7. The multi-layer structure-based tunable polarization-encoded radome according to claim 1, characterized in that: It also includes a signal processor (14), which is connected to the computer and the antenna (13) respectively, and is used to collect and process antenna signals and feed them back to the computer.

Images