CN112688074B - Adjustable signal radome based on multi-layer structure - Google Patents

Abstract

The invention discloses an adjustable signal radome based on a multilayer structure. The device comprises a dielectric layer, an electromagnetic coil, a protective cover, a carrying circular table, an antenna, a rotating device and a control circuit; the dielectric layer comprises a plurality of dielectric groups which are sequentially stacked; the medium group comprises a first medium, a plasma crystal and a first medium which are sequentially arranged; the electromagnetic coil consists of a magnet and a coil, is arranged at the periphery of the dielectric layer through a bracket and is connected with a current controller; the protective cover is used as a rigid structure to protect internal devices; the carrying round table is used as a base of the radome; the antenna is placed on a circular shaft of the rotating device to complete the receiving and sending of signals; the invention utilizes the stacking of different dielectric materials and regulates the plasma frequency, the plasma cyclotron frequency and the angle of transmitting and receiving signals of the antenna in a programming mode, thereby realizing the regulation of the signal radome to required signals and the shielding of interference signals. The signal radome has the main advantages of integration, high sensitivity, adjustability and controllability, and belongs to a high-performance signal selection and protection device.

Description

Adjustable Signal Radome Based on Multilayer Structure

technical field

The invention belongs to the technical field of electronic communication, and in particular relates to an adjustable signal radome based on a multi-layer structure.

Background technique

With the development of modern high technology, radars are widely used in aircraft, missiles, navigation and other fields, and the use of radomes is also becoming more and more extensive.

The radome is the window of electromagnetic waves. Its function is to protect the antenna and prevent the environment from affecting and interfering with the working state of the radar antenna, so as to reduce the power driving the antenna, improve its working reliability, and ensure the radar antenna to work around the clock. The existence of the radome prolongs the service life of the antenna, simplifies the structure of the antenna, and reduces the weight of the structure. The radome is an important part of the radar system, and its performance directly affects the function of the radar system. It can be said that the radome is as important as the antenna. It is required that the radome has the least influence on the electromagnetic radiation characteristics of the antenna and meets the requirements of tactical technical indicators.

But there are following deficiencies in existing radome:

1. The radome cannot control and change the on-off frequency range of the signal, and it is difficult to realize the mode modulation of the frequency; 2. The radome is relatively heavy and has a complex structure, which is troublesome to install.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide an adjustable signal radome based on a multi-layer structure, which can realize the control of required signals.

In order to solve the problems of the technologies described above, the present invention is achieved by adopting the following technical solutions:

The invention provides an adjustable signal radome based on a multi-layer structure, which includes a round table for loading objects, a rotating device arranged on the round table for carrying objects, a micro motor for driving the rotating device, and a cover arranged on the rotating device. The dielectric layer, the electromagnetic coil covered on the dielectric layer, the protective cover provided on the electromagnetic coil, and the control circuit electrically connected with the electromagnetic coil; the rotating device includes a turntable, and the turntable and a circular shaft arranged on the turntable, the circular shaft is provided with a position for installing the antenna; the dielectric layer includes a plasma crystal, and the plasma crystal can change with the change of the magnetic field strength and direction of the environment Its plasma cyclotron frequency; the control circuit changes the strength and direction of the magnetic field generated by the electromagnetic coil by controlling the current of the electromagnetic coil, and then regulates the plasma cyclotron frequency of the plasma crystal; the control circuit communicates with the A micro motor is connected to control the rotation angle of the rotation device.

Further, the dielectric layer is a multi-layer dielectric stack structure, including a first dielectric, a second dielectric and a plasma crystal, and a unit layer of the dielectric layer is composed of "first dielectric-second dielectric-plasma crystal-second Medium - the first medium" form.

Further, the dielectric layer includes 6 unit layers; the thickness of the first dielectric is 1 mm, the thickness of the second dielectric is 2 mm, and the thickness of the plasma crystal is 0.2 mm.

第二介质的折射率n_B＝1。Further, the refractive index of the first medium

The refractive index n _B =1 of the second medium.

Further, the electromagnetic coil includes a magnet and a coil wound on the magnet, and the coil is electrically connected to the control circuit.

Further, the radome device performs data transmission and program control with a computer through a data connection port provided on the wall of the loading circular table.

Further, the radome further includes a current controller for regulating the plasma frequency, and the current controller can be connected to the current controller interface provided on the wall of the object-carrying circular platform.

Further, the radome further includes a signal processor, which is connected to a computer and feeds back signal processing information to the computer.

Further, a power switch for controlling on-off of the circuit and a power line interface for connecting to an external power supply are also provided on the wall of the object-carrying circular platform.

On the other hand, the present invention also provides a radar, including an antenna and the adjustable signal radome based on the multi-layer structure described in the first aspect.

Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

1. The present invention uses a combined stack of plasma material and ordinary medium as the medium layer to generate a transmission window in the broadband absorption band of the signal radome, and regulates the angle of the antenna to send and receive signals through the rotating device, and regulates the plasma gyration through the control circuit Frequency, to realize the adjustment of the transmission window in the absorption band or the total absorption in transmission, and then change the on-off frequency range of the signal to realize the mode modulation of the frequency;

2. The present invention is also equipped with a current controller, which can regulate the plasma frequency, so as to realize the regulation of the transmission window in the absorption band or the total absorption in transmission, and then change the on-off frequency range of the signal to realize the mode modulation of the frequency;

3. The control circuit and the current controller of the present invention are connected to the computer through the data connection port and the current controller interface arranged on the wall of the object-carrying round platform, so that the control circuit and the current controller can be programmed and adjusted;

4. The present invention realizes the integrated design of the signal radome by combining the antenna device, the multi-layer stacking medium and the protective cover device;

5. The present invention realizes the tuning of the transmission window in the absorption band and the total absorption in transmission through the adjustment of the plasma frequency and the plasma cyclotron frequency; compared with the traditional signal radome, the present invention has the advantage of being In the frequency band, multi-angle transmission and reception of signals can be completed, and at the same time, the shielding of interference signals and the transmission of required signals can be realized; the invention is integrated, highly sensitive, and adjustable, and belongs to a high-performance signal selection and protection device.

Description of drawings

Figure 1 is a schematic diagram of the overall system structure of the adjustable signal radome;

Fig. 2 is a schematic structural diagram of an adjustable signal radome;

Fig. 3 is a perspective view of the structure of the adjustable signal radome;

Figure 4 is a sectional view of the adjustable signal radome;

Fig. 5 is the coil schematic diagram of adjustable signal radome;

Fig. 6 is the front view of the rotating device of the adjustable signal radome;

Fig. 7 is a side view of the rotating device of the adjustable signal radome;

Figure 8 is a perspective view of the antenna;

Fig. 9 is a schematic diagram of the dielectric layer stacking of the adjustable signal radome;

Fig. 10 is three views of micro motor;

Fig. 11 is the basic working flowchart of adjustable signal radome;

Figure 12 shows the absorption, transmission and reflection of the plasma frequency ω _P =2π×1.2×10 ⁹ rad/s and ω _P =2π×1×10 ⁹ rad/s controlled by the plasma and the external magnetic field of the adjustable signal radome curve;

Figure 13 is the absorption, transmission and reflection curves of the plasma frequency ω _P =2π×1.5×10 ⁹ rad/s adjusted by the plasma and an external magnetic field for the adjustable signal radome;

Fig. 14 is the total absorption curve of the tunable signal radome in transmission modulated by plasma and external magnetic field.

In the picture:

1. Dielectric layer; 2. Electromagnetic coil; 3. Protective cover; 4. Loading round platform; 5. Rotating device; 6. Power switch; 7. Data connection port; 8. Current controller interface; 9. Power line interface; 10. Coil; 11. Magnet; 12. Control circuit; 13. Antenna; 14. Turntable; 15. Signal processor.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Embodiment one:

This embodiment provides an adjustable signal radome based on a multi-layer structure, the structure of which is shown in FIGS. 1 to 10 . It includes a dielectric layer 1, an electromagnetic coil 2, a protective cover 3, an object-carrying round platform 4, an antenna and a rotating device 5, and a control circuit 12; the dielectric layer 1 is a multi-layer dielectric stack structure composed of magnetized plasma materials and two common media . By adjusting the plasma frequency and plasma whirling frequency of the magnetized plasma material, the absorption and transmission working bandwidth of the signal radome can be adjusted.

As shown in Figures 1-4, the present invention discloses an adjustable signal radome based on a multi-layer structure, which includes an object-carrying round platform 4, and four ports are arranged on the wall of the object-carrying round platform 4, which are respectively a power switch 6 and a data connection port. 7. Current controller interface 8, power line interface 9. A protective cover 3 , an electromagnetic coil 2 , a dielectric layer 1 , and a rotating device 5 are arranged on the object-carrying round platform 4 .

The electromagnetic coil 2, as shown in FIG. 5, is mainly composed of a magnet 11 and an outer coil 10, wherein the control circuit 12 regulates the coil current, and then changes the magnetic field strength and direction to realize the regulation of the plasma cyclotron frequency.

Fig. 6 and Fig. 7 are respectively the front view and the side view of rotating device 5, and rotating device 5 is connected with the micro-motor that provides power, and micro-motor structure is as shown in Fig. 10, among Fig. 10 (a) (b) (c) respectively It is the three views of the micro-motor, and the angle of the antenna 13 is adjusted by rotating the circular shaft and the turntable 14, thereby providing the conditions for the antenna 13 to realize the transmission and reception of signals at various angles. The main function of the antenna 13 is to complete the transmission and reception of signals, and at the same time Signal processor 15 completes signal processing. As shown in Figure 8, the three-dimensional view of the antenna is shown in the figure, the control circuit 12 and the current controller are realized by programming, wherein the control circuit changes the magnitude and direction of the external magnetic field generated by the electromagnetic coil by controlling the turntable and the electromagnetic coil, and completes the adjustment of the antenna. The angle of sending and receiving signals and the adjustment of the plasma gyration frequency, and the current controller can regulate the plasma frequency. Therefore, we can control the plasma frequency, the plasma gyration frequency and the angle of the antenna sending and receiving signals through programming to realize the absorption band of the signal radome. Frequency-dependent mode modulation is achieved by shifting the transmission band to the left or right.

Dielectric layer 1 is made of two common mediums (the first medium A and the second first medium B) and plasma crystal (medium P), as shown in Figure 9, the thickness of the first medium A is 1mm, the second The thickness of the first medium B is 2 mm, and the thickness of the plasmonic photonic crystal P is 0.2 mm. The dielectric layer is composed of "A-B-P-B-A", the structure period is 6, and the total thickness is 37.2 mm.

Figure 11 is the basic working flow chart of the adjustable signal radome. It can be seen from Figure 11 that the computer acts as the core controller to simultaneously regulate the control circuit and the current controller. The size and direction of the external magnetic field can be used to complete the adjustment of the antenna sending and receiving signal angle and the plasma gyration frequency, and the current controller can regulate the plasma frequency. Finally, the signal processor 15 will feed back the signal processing information to the computer to complete a signal processing.

得到，N为载流子密度，e为电子电量，ε₀为真空介电常数，m_e为电子质量，通过外加电流即可改变载流子密度，从而实现对等离子体频率的调节。The current controller belongs to an independent external device, which is connected to the radome through the current controller interface set on the wall of the loading circular platform; the principle is: since the plasma frequency ωp can be obtained by the formula

It is obtained that N is the carrier density, _e is the electron quantity, ε ₀ is the vacuum permittivity, and me is the electron mass. The carrier density can be changed by applying an external current, thereby realizing the adjustment of the plasma frequency.

Figure 12 and Figure 13 are the absorption, transmission and reflection curves of the adjustable radome regulated by plasma and external magnetic field, and the incident angle of the signal is θ=82°. As shown in Fig. 12(a), the plasma frequency is ω _P =2π×1.2×10 ⁹ rad/s, and the collision frequency is ν _C =0.03ω _P . The distribution law of the plasma cyclotron frequency ω _C is a piecewise function, which is composed of two arithmetic series, and the specific expression is ω _cn =(1+0.05n)ω _p (n=0-20,60-76), The step size is 0.05. It can be seen from Fig. 12(a) that the absorption frequency domain of the signal radome is 1.2-2.2GHz and 4-4.6GHz, and the transmission frequency domain is 2.2-4GHz. As shown in Fig. 12(b), the plasma frequency is changed to ω _P =2π×1×10 ⁹ rad/s, and the collision frequency is ν _C =0.03ω _P . The distribution law of the plasma cyclotron frequency ω _C is a piecewise function, which is composed of two arithmetic series, and the specific expression is ω _cn =(1+0.05n)ω _p (n=0-20,56-76), The step size is 0.05. It can be seen from Fig. 12(b) that the absorption frequency domain of the radome is 2.02-2.47GHz, and the transmission frequency domain is 1.18-2.02GHz. Obviously, by adjusting the plasma frequency of the dielectric layer in the signal radome, the tunable absorption and transmission working bands of the signal radome can be realized.

As shown in Fig. 13(a), the plasma frequency is changed to ω _P =2π×1.5×10 ⁹ rad/s, and the collision frequency is ν _C =0.03ω _P . The distribution law of the plasma cyclotron frequency ω _C is a piecewise function, which is composed of two arithmetic series, and the specific expression is ω _cn =(1+0.05n)ω _p (n=10-20,70-80), The step size is 0.05; it can be seen from Figure 13(a) that the absorption frequency domain of the radome is 5.1-5.3GHz and 7.9-8.1GHz, and the transmission frequency domain is 5.3-8.1GHz. As shown in Fig. 13(b), the plasma frequency is ω _P =2π×1.5×10 ⁹ rad/s, and the collision frequency is ν _C =0.02ω _P . The distribution law of the plasma cyclotron frequency ω _C is a piecewise function, which is composed of two arithmetic series, and the specific expression is ω _cn =(1+0.05n)ω _p (n=40-44,60-64), step The length is 0.05; as can be seen from Figure 13(b), the radome absorption frequency domain is 5.8-6.1GHz and 6.7-7.0GHz, and the transmission frequency domain is 6.1-6.8GHz. Therefore, we can tune the working bandwidth of the radome absorption and transmission bands by adjusting the plasma frequency and the plasma cyclotron frequency.

As shown in Figure 14, the incident angle of the signal is θ=82°, the plasma frequency is adjusted to ω _P =2π×1.5×10 ⁹ rad/s, and the collision frequency is ν _C =0.03ω _P . The distribution law of the plasma cyclotron frequency ω _C is a piecewise function, which is composed of two arithmetic series, and the specific expression is ω _cn =(1+0.05n)ω _p (n=0-40,40-80), step The length is 0.05. As shown in the figure, the absorption frequency domain of the signal radome is 2-8GHz, and this phenomenon is called total absorption in transmission hereinafter.

Therefore, by adjusting the plasma frequency and the plasma cyclotron frequency, we can realize the left and right movement of the absorption band of the signal radome and the adjustment of the bandwidth, and at the same time, the movement of the reflection band and transmission band of the signal radome in different frequency bands can be realized. This makes it easy to change the on and off frequency range of the signal, enabling pattern modulation of the frequency.

Implementation principle: Plasma photonic crystals are the product of the intersection of plasma science and photonic crystal science. Plasma photonic crystals have higher tunable performance than traditional dielectric and metal photonic crystals: electromagnetic waves with a frequency lower than the plasma frequency Unable to propagate through the plasma, electromagnetic waves are guided below the plasma frequency when the medium component is periodically introduced. The present invention utilizes the stacking of different dielectric materials to stack the magnetized plasma and the common medium, so as to generate a transmission window in the broadband absorption working band, and regulate the plasma frequency, the plasma cyclotron frequency, and the angle of the antenna to send and receive signals through programming. Effectively control the absorption, transmission and reflection working frequency bands. At the same time, the shielding function of the signal radome to the interference signal is increased to improve its working reliability. Among them, the general antennas are reversible, that is, the same antenna can be used as both a transmitting antenna and a receiving antenna. Combined with this structure, multi-angle selective signal transmission and reception can be realized.

Compared with the traditional complex structure, the present invention has its unique performance and advantages: (1) Adjustable: adjust the plasma frequency and plasma cyclotron frequency and the angle of the antenna to transmit and receive signals through programming, so as to realize the transmission window in the absorption band or The adjustment of the total absorption in the transmission, and then change the on-off frequency range of the signal, and realize the mode modulation of the frequency; (2) multi-function: the present invention can realize the mode modulation of the angle- and frequency-related signals. (3) Integration: the present invention realizes the integrated design of the signal radome by combining the antenna device, the multi-layer stacking medium and the protective cover device.

The invention realizes the tuning of the transmission window in the absorption band and the total absorption in transmission through the adjustment of the plasma frequency and the plasma cyclotron frequency. Compared with the traditional signal radome, the present invention has the advantage that in the working frequency band, multi-angle transmission and reception of signals can be completed, and at the same time, the shielding of interference signals and the transmission of required signals can be realized.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features, and in the description of the present invention, the meaning of "multiple" is two or two above, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection Or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "below" and "under" the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is less horizontal than the second feature.

In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" etc. means that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above 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.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (10)

1. The adjustable signal radome based on the multilayer structure is characterized by comprising a carrying circular truncated cone (4), a rotating device (5) arranged on the carrying circular truncated cone (4), a micro motor for driving the rotating device (5), a medium layer (1) covered on the rotating device (5), an electromagnetic coil (2) covered on the medium layer (1), a protective cover (3) covered on the electromagnetic coil (2) and a control circuit (12) electrically connected with the electromagnetic coil (2);

the rotating device (5) comprises a rotating disc (14), a bracket arranged on the rotating disc (14) and a rotatable round shaft arranged on the bracket, wherein the round shaft is provided with a position for mounting an antenna (13);

the dielectric layer (1) comprises a plasma crystal, and the plasma cyclotron frequency of the plasma crystal can be changed along with the change of the magnetic field intensity and the direction of the environment;

the control circuit (12) changes the intensity and the direction of a magnetic field generated by the electromagnetic coil (2) by controlling the current of the electromagnetic coil (2), so as to regulate and control the plasma cyclotron frequency of the plasma crystal; the control circuit (12) is connected with the micro motor to control the rotation angle of the circular shaft of the rotating device (5).

2. The radome of claim 1, wherein the dielectric layer (1) is a multilayer dielectric stack structure comprising a first dielectric, a second dielectric and plasmonic crystals, and the unit layer of the dielectric layer (1) is formed by the form of "first dielectric-second dielectric-plasmonic crystals-second dielectric-first dielectric".

3. The radome of claim 2 wherein the dielectric layer (1) comprises 6 unit layers; the thickness of the first medium is 1mm, the thickness of the second medium is 2mm, and the thickness of the plasma crystal is 0.2mm.

4. The tunable signal radome of claim 3 wherein the first medium has an index of refraction of

The refractive index of the second medium is 1.

5. The multiple-layer structure-based adjustable-signal radome of claim 1, wherein the electromagnetic coil (2) comprises a magnet (11) and a coil (10) wound on the magnet (11), the coil (10) being electrically connected to the control circuit (12).

6. The radome based on multilayer structure, according to claim 1, characterized in that the radome device is in data transmission and program control with a computer via data connection ports (7) provided in the wall of the carrier table (4).

7. Multilayer structure based adjustable signal radome of claim 1, wherein the radome comprises a current controller for regulating the plasma frequency, which current controller is connectable to a current controller interface (8) arranged on the wall of the carrier table (4).

8. The radome of claim 1 wherein the radome further comprises a signal processor (15), the signal processor (15) is connected to a computer, and information about processing of the signal is fed back to the computer.

9. The adjustable-signal radome based on the multilayer structure as claimed in claim 1, wherein the wall of the carrying platform (4) is further provided with a power switch (6) for controlling the on/off of the circuit (12) and a power line interface (9) for connecting an external power supply.

10. A radar characterized by comprising an antenna (13) and an adjustable-signal radome based on a multilayer structure according to any one of claims 1-9.

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