CN215732196U

CN215732196U - High-power light built-in broken line grid type polarization conversion antenna housing

Info

Publication number: CN215732196U
Application number: CN202122051320.8U
Authority: CN
Inventors: 李相强; 黄贵春; 张健穹; 王庆峰
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-02-01
Anticipated expiration: 2031-08-27

Abstract

The utility model discloses a high-power light built-in fold line grating type polarization conversion antenna housing which is arranged on an antenna array and comprises a polarization conversion plate and a medium sealing cover, wherein the polarization conversion plate is positioned in the medium sealing cover and comprises a medium layer and a conducting layer; the antenna array comprises a spiral array antenna and an antenna substrate, and the spiral array antenna is fixed on the antenna substrate; the polarization conversion plate is fixedly connected with the antenna array through an internal strut; the dielectric sealing cover is coplanar with the wave plane of the antenna array. Through the mode, the high-power light built-in fold line grating type polarization conversion antenna housing can be provided, and the effects of line-circular polarization interconversion and antenna housing sealing can be simultaneously achieved, so that the antenna housing is suitable for microwave radiation under the high-power condition. The device has the characteristics of simple and compact structure, light weight, strong environmental adaptability and high peak power.

Description

High-power light built-in broken line grid type polarization conversion antenna housing

Technical Field

The utility model relates to the technical field of high-power microwaves, in particular to a high-power light built-in broken line grating type polarization conversion antenna housing.

Background

With the development of high-power microwave technology, the requirements for the radiation antenna are not limited to high power, but on the premise of ensuring high power, the radiation antenna has a multifunctional and multipurpose application requirement, which is mainly embodied in that the antenna needs to work in different polarization modes. The polarization characteristic is one of the core parameters of the antenna, and in some practical applications, the antenna needs to operate in multiple polarization states simultaneously or in time-sharing mode, and the polarization converter is generated accordingly. Currently, external polarization converters reported at home and abroad can be roughly classified into four types: grating-type polarization converters, meander-line grating-type polarization converters, metamaterial-or super-surface-based polarization converters, and Frequency Selective Surface (FSS) -based polarization converters. Among these, metamaterial or super-surface based polarization converters and Frequency Selective Surface (FSS) based polarization converters are under low power conditions.

The broken line grating type polarizer is researched by a team to develop an embedded high-power polarization conversion antenna housing, but the embedded high-power polarization conversion antenna housing is large in mass due to the fact that the density of materials selected by an embedding process is high, and the total thickness of a medium layer is increased due to an embedded structure. Meanwhile, the embedded polarization conversion plate is located outside the medium sealing plate and has weak environmental adaptability.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a high-power light built-in fold line grating type polarization conversion antenna housing.

In order to achieve the purpose of the utility model, the utility model adopts the technical scheme that:

a high-power light built-in broken line grating type polarization conversion antenna housing is provided, wherein the polarization conversion antenna housing is arranged on an antenna array and comprises a polarization conversion plate and a medium sealing cover; the polarization conversion plate is positioned in the medium sealing cover and comprises a medium layer and a conducting layer; the antenna array is positioned at the bottom of the dielectric sealing cover and comprises a spiral array antenna and an antenna substrate, and the spiral array antenna is fixed on the antenna substrate; the polarization conversion plate is fixedly connected with the antenna array through an internal strut; the dielectric sealing cover is coplanar with the wave plane of the antenna array.

Further, the dielectric layers comprise a first dielectric layer and a second dielectric layer, the first dielectric layer and the second dielectric layer are arranged at intervals, and an air layer is formed in the middle area of the first dielectric layer and the second dielectric layer.

Furthermore, the conducting layer comprises a first conducting layer and a second conducting layer, and the first conducting layer and the second conducting layer are respectively arranged on the upper plane and the lower plane of the second dielectric layer and are closely attached to the second dielectric layer.

Further, the first conducting layer and the second conducting layer are the same in structure and are conducting material patterns with two-dimensional periodicity.

Further, the conductive material pattern is a zigzag periodic fold line, the width w of the periodic fold line, the height h of the fold line, the horizontal period a, the vertical period b, and the inward angle radius r₁Radius of outward angle r₂Are all positive numbers.

Further, the first conductive layer and the second conductive layer are made of the same material.

Further, the first dielectric layer and the second dielectric layer are made of different materials.

The utility model has the following beneficial effects:

the periodic broken line grating structure is adopted, the polarization conversion antenna housing structure is simplified, and the whole weight of the antenna housing is reduced by selecting a light medium; the polarization conversion plate is placed in the sealing cover, so that the metal layer is prevented from contacting air, and the power capacity of the polarization conversion antenna housing is improved; the polarization conversion is realized in the antenna housing, so that the environmental adaptability of the antenna housing is enhanced, the size of an antenna system is basically not increased, the structure is simple and compact, the antenna housing is suitable for an application scene of circular polarization-linear polarization interconversion under a high-power condition, and the antenna housing is not influenced by an external environment.

Drawings

Fig. 1 is a schematic view of a radome structure according to the present invention;

fig. 2 is a schematic plane structure diagram of a conductive layer of an antenna housing according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a simulation curve of the reflection coefficient of the antenna system according to the embodiment of the present invention;

FIG. 4 is a schematic diagram of an axial ratio simulation curve of an antenna system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating simulation of field intensity distribution on a top surface of an antenna housing according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating simulation of field intensity distribution of a conductive layer according to an embodiment of the present invention.

Description of reference numerals: 11. a first dielectric layer; 12. an air layer; 13. a second dielectric layer; 21. a first conductive layer; 22. a second conductive layer; 31. an inner strut; 40. a helical array antenna; 41. an antenna substrate.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the utility model as defined and defined in the appended claims, and all changes that come within the meaning and range of equivalency of the claims are to be embraced therein.

This example is a high-power light-duty built-in broken line grating type polarization conversion radome, as shown in fig. 1, which includes: a polarization conversion plate and a medium sealing cover; the polarization conversion plate is positioned in the medium sealing cover and comprises a medium layer and a conducting layer; the antenna array is positioned at the bottom of the dielectric sealing cover and comprises a spiral array antenna and an antenna substrate, and the spiral array antenna is fixed on the antenna substrate; the polarization conversion plate is fixedly connected with the antenna array through an internal strut; the dielectric sealing cover is coplanar with the wave plane of the antenna array.

The helical array antenna 40 emits a plane wave whose wavefront is planar.

In the embodiment, a C-band high-power radial line helical array antenna 40 is adopted to form a transmitting system, and the working frequency is 4.3 GHz.

The top of the radome of the present example is also a planar structure coplanar with the wave front, see fig. 1 and 2.

The radome of the embodiment comprises 2 single-layer dielectric layers, 1 layer of air and 2 conductive layers. Shown in fig. 1 are a first dielectric layer 11, an air layer 12, a second dielectric layer 13, and first and second conductive layers 21 and 22, respectively.

First conductive layer 21 and second conductive layer 22 are plated on the upper and lower surfaces of second dielectric layer 13 in positions that are mirrored with respect to second dielectric layer 13.

In this embodiment, the first dielectric layer 11 is made of high density polyethylene, the first conductive layer 21 and the second conductive layer 22 are made of the same metal copper, and the second dielectric layer 13 is made of plating grade ABS plastic.

In this example, the first conductive layer 21 and the second conductive layer 22 have the same structure and shape, and a zigzag line pattern made of a conductive material is formed as shown in fig. 2. The horizontal period a of the broken line pattern is 18.5mm, the vertical period b of the broken line pattern is 24.5mm, the height h of the broken line is 17.3mm, the width w of the broken line is 4mm, and the outer arc radius r of the broken line pattern₁5.5mm, the radius r of the inner arc of the broken line grid₂The thickness d1 of the medium layer 12 is 5mm, and the thickness d2 of the medium of the sealing cover is 4 mm; the parameters form a transmitting system formed by loading a built-in broken line grating type polarization conversion antenna housing with the size of 350mm multiplied by 410mm to a C-band high-power radial line spiral array antenna, and the conversion from linear polarized waves to circularly polarized waves can be realized.

Obviously, according to the reciprocity principle, the radome of the present embodiment can also realize the conversion from circularly polarized waves to linearly polarized waves.

Those skilled in the art will understand that parameters of the dielectric layer, such as dielectric constant and thickness, and the pattern parameters w, h, a, b, r of the conductive layer in this example, can be adjusted₁、r₂The antenna housing can be suitable for transmitting systems with different working frequencies to finish the interconversion of linearly polarized wave and circularly polarized wave. According to the antenna housing, the thickness t of the conducting layer has no influence on microwave electrical parameters of the antenna housing, and the thickness of the conducting layer can be not considered.

The working principle of the radome of the embodiment is simply described as follows:

the linear polarized wave can be decomposed into a vertical shield component and a horizontal component, when the linear polarized wave enters, the folded wire grid respectively presents shunt inductance and capacitance effects on the vertical component and the horizontal component to generate phase lag and lead, and when the vertical component and the horizontal component have equal field strengths and have a phase difference of 90 degrees, the linear polarized wave is converted into circular polarized wave; the conversion of circularly polarized waves into linearly polarized waves can also be realized from the principle of reciprocity. The parameters of the folded wire grid and the medium plate are reasonably adjusted, so that the polarization conversion antenna housing can keep a good matching state and good polarization conversion efficiency, and the polarization conversion antenna housing can be suitable for different working frequencies. Importantly, the metal broken line gate electrode is plated on the light-duty dielectric plate, so that the whole weight of the antenna housing is small, the structure is compact, the metal broken line gate electrode is positioned in the sealing cover and is prevented from being in contact with air and an external environment, the power capacity of the polarization conversion antenna housing can be effectively improved, and the practicability of the antenna housing is improved.

Compared with the prior art, the utility model adopts a built-in structure, avoids the contact of a metal fold line and air, improves the power capacity of the polarization conversion antenna housing, and reduces the weight of the antenna housing by adopting a surface electroplating structure. Polarization conversion is realized in the interior of the antenna housing, the size of an antenna system cannot be increased, the system is simple and compact in structure, the polarization conversion process is located in the sealing cover, the environmental influence is small, and the adaptability and the practicability are high. The method is suitable for being applied and implemented in practical engineering of interconversion of linear polarized waves and circular polarized waves under the high-power condition.

The first conductive layer 21 and the second conductive layer 22 in this embodiment can be manufactured into the folded wire grids by coating, etching, and other processes, a light electroplating material such as electroplating-grade ABS is selected for double-sided electroplating, then metal folded wire grids are formed on two sides of the dielectric substrate by etching, and finally the metal folded wire grids are fixed to the antenna substrate 41 through the inner pillars of the radome.

From the data simulation results, as shown in FIG. 3, at a frequency of 4.3GHz, the reflection coefficient S₁₁<0.2, the matching effect is good. When the working frequency f is 4.3GHz, the high-power radial line helical array antenna radiates circular polarized waves, and the reflection coefficient S is₁₁0.18, and 20dB of axial ratio AR, as shown in the figure3 and 4. The radiation wave is linearly polarized wave after passing through the antenna housing, and the effect of converting circularly polarized wave into linearly polarized wave is good. The maximum field strength at the outer surface of the radome (outside the first dielectric layer 11) is 84.1V/m, see fig. 5. Calculating the power capacity to be 636MW according to the breakdown threshold value of air being 3 MV/m; maximum field strength 869V/m on the wire grid, as shown in FIG. 6. And calculating the power capacity to be 80MW according to the dielectric internal breakdown threshold value of 11 MV/m. In general, the power capacity of the polarization conversion radome is 80 MW.

The results show that the polarization conversion antenna housing has the characteristics of high peak power, strong practicability, applicability in complex environment, simple and compact structure, good matching, excellent polarization conversion performance, mature processing technology and the like.

It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the utility model and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the utility model, and these changes and combinations are within the scope of the utility model.

Claims

1. A high-power light built-in fold line grating type polarization conversion antenna housing is provided, wherein the polarization conversion antenna housing is arranged on an antenna array, and is characterized by comprising a polarization conversion plate and a medium sealing cover, wherein the polarization conversion plate is positioned in the medium sealing cover and comprises a medium layer and a conducting layer; the antenna array comprises a spiral array antenna (40) and an antenna substrate (41), wherein the spiral array antenna (40) is fixed on the antenna substrate (41); the polarization conversion plate is fixedly connected with the antenna array through an inner strut (31); the dielectric sealing cover is coplanar with the wave plane of the antenna array.

2. The high-power light built-in folding line grating type polarization conversion radome of claim 1, wherein the dielectric layers comprise a first dielectric layer (11) and a second dielectric layer (13), the first dielectric layer (11) and the second dielectric layer (13) are arranged at intervals, and an air layer (12) is formed in the middle area of the first dielectric layer and the second dielectric layer.

3. The high-power light built-in fold line grating type polarization conversion radome of claim 2, wherein the conductive layers comprise a first conductive layer (21) and a second conductive layer (22), and the first conductive layer (21) and the second conductive layer (22) are respectively arranged on the upper plane and the lower plane of a second dielectric layer (13) and are closely attached to the second dielectric layer (13).

4. The high-power light built-in fold line grating polarization conversion radome of claim 3, wherein the first conductive layer (21) and the second conductive layer (22) are identical in structure and are both provided with two-dimensional periodic conductive material patterns.

5. The high-power light-weight built-in meander-grid polarization conversion radome of claim 4, wherein the conductive material pattern is a zigzag periodic meander, and the width w of the periodic meander, the height h of the periodic meander, the horizontal period a, the vertical period b, the inward angle radius r1, and the outward angle radius r2 are positive numbers.

6. The high-power light built-in fold line grating polarization conversion radome of claim 5, wherein the first conductive layer (21) and the second conductive layer (22) are made of the same material.

7. The high-power light built-in folding line grating type polarization conversion radome of claim 6, wherein the materials of the first medium layer (11) and the second medium layer (13) are different.