阅读说明：本技术 一种双线极化加双圆极化四端口可重构介质谐振天线 (Double-linear polarization and double-circular polarization four-port reconfigurable dielectric resonant antenna ) 是由 陈智娇 江雨键 俞俊生 姚远 亓丽梅 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种双线极化加双圆极化四端口可重构介质谐振天线,属于无线通信领域。从上到下依次为圆形介质块、两层介质块、介质馈板、介质基板、同轴探针和底部馈电网络。圆形介质块下方通过介质馈板与介质基板固定,固定连接处通孔中穿过同轴探针。两层介质块固定在介质基板中心,在介质基板中心留有缝隙。介质基板下表面分布底部馈电网络,在每个角上设置一个端口。圆形介质块通过同轴探针连接底部馈电网络,对应连接一、四端口,激励线极化,切换馈电端口实现水平和垂直极化方向上的可重构；两层介质块通过缝隙与底部馈电网络耦合,对应连接二、三端口,激励圆极化,切换馈电端口实现左旋和右旋圆极化的可重构。本发明实现多种可重构配置。(The invention discloses a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna, and belongs to the field of wireless communication. The feed line comprises a circular dielectric block, two layers of dielectric blocks, a dielectric feed plate, a dielectric substrate, a coaxial probe and a bottom feed network from top to bottom in sequence. The lower part of the circular medium block is fixed with the medium substrate through the medium feed plate, and the coaxial probe penetrates through the through hole at the fixed connection part. The two layers of dielectric blocks are fixed at the center of the dielectric substrate, and a gap is reserved at the center of the dielectric substrate. And a bottom feed network is distributed on the lower surface of the dielectric substrate, and a port is arranged at each corner. The circular dielectric block is connected with a bottom feed network through a coaxial probe, is correspondingly connected with a first port and a fourth port, excites linear polarization, and switches feed ports to realize reconfiguration in horizontal and vertical polarization directions; the two layers of dielectric blocks are coupled with the bottom feed network through gaps, are correspondingly connected with the two ports and the three ports, excite circular polarization, and switch the feed ports to realize reconfiguration of left-hand circular polarization and right-hand circular polarization. The invention realizes various reconfigurable configurations.)

1. A dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna is characterized by sequentially comprising a circular dielectric resonant block, two layers of dielectric resonant blocks, a dielectric resonant feed plate, a dielectric substrate, a coaxial probe and a bottom feed network from top to bottom;

the left side and the right side below the top circular dielectric resonance block are symmetrically provided with dielectric resonance feed plates, and the dielectric resonance feed plates are fixed with the dielectric substrate through soldering tin to support the circular dielectric resonance block;

a through hole is formed in the position, connected with the dielectric substrate, outside the dielectric resonance feed plate and used for penetrating through the coaxial probe;

the two layers of dielectric resonance blocks comprise upper and lower layers of dielectric resonance blocks with the same size and different dielectric constants, and are adhered together through conductive adhesive; the lower surfaces of the two layers of dielectric resonance blocks are fixed at the center of the upper surface of the dielectric substrate, and a gap is reserved between the lower surfaces of the two layers of dielectric resonance blocks and the dielectric substrate;

the method specifically comprises the following steps:

the upper surface of the dielectric substrate is provided with a copper coating, however, a blank gap is left on the dielectric substrate at the center under the two layers of dielectric resonance blocks, which is equivalent to introducing a second resonance structure, and the working frequency band of the gap and the dielectric resonance blocks are positioned in the same range by adjusting the size of the gap strip, so that the purpose of expanding the bandwidth is realized;

the dielectric substrate is a rectangular plate, and the bottom of the lower surface of the dielectric substrate is distributed with a feed network; the medium substrate adopts a four-port excitation mode, each corner is provided with a port, and the ports are named as a first port, a second port, a third port and a fourth port along the clockwise direction;

each port of the bottom feed network is respectively connected with a microstrip line and a corresponding extension line, the first port and the fourth port are connected with the orthogonal coupling feed network through the respective extension lines, and the two ports are respectively connected with a coaxial probe in the through hole at the tail end of the extension line of the microstrip line; the second port and the third port are connected with the semicircular microstrip line structure through extension lines;

feeding through the first port, wherein the difference between the length of the microstrip line between the first port and the coaxial probe and the length of the microstrip line between the fourth port and the coaxial probe is 0, and the phase difference between the corresponding first port and the corresponding fourth port is 0 degree;

feeding through the fourth port, so that the difference between the length of the microstrip line between the first port and the coaxial probe and the length of the microstrip line between the fourth port and the coaxial probe is 1/2 lambda, and the corresponding phase difference between the first port and the fourth port is 180 degrees;

the circular dielectric resonance block is connected with a bottom feed network through a coaxial probe connected with the dielectric resonance feed plate, and then the bottom feed network is correspondingly connected with a first port and a fourth port of the dielectric substrate, so that excitation linear polarization is realized;

the microstrip line extension lines corresponding to the second port and the third port are bent or the positions of the microstrip line extension lines are adjusted, so that the structure of the bottom feed network and the two layers of dielectric resonance blocks above the bottom feed network are positioned in the center of the dielectric substrate, the two layers of dielectric resonance blocks realize coupling feed with the bottom feed network through a copper-plated layer gap, and the bottom feed network is correspondingly connected with the second port and the third port of the dielectric substrate, so that circular polarization excitation is realized.

2. The dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna as claimed in claim 1, wherein in the two-layer dielectric resonator block, the dielectric constant of the upper dielectric resonator block is greater than that of the lower dielectric resonator block; the two layers of dielectric resonance blocks are circular, the radius of the two layers of dielectric resonance blocks is smaller than that of the top circular dielectric resonance block, and the centers of the two layers of dielectric resonance blocks are coincident.

3. The dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna as claimed in claim 1, wherein the two-layer dielectric resonator block is replaced by a three-layer dielectric resonator block or a four-layer dielectric resonator block.

4. The dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna as claimed in claim 1, wherein the dielectric resonant feed plate is adhered with a copper foil patch through a conductive adhesive.

5. The dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna as claimed in claim 1, wherein the blank slot is formed by three rectangles or four rectangles, and is in a shape of a triangle, a slot shaped like a Chinese character 'mi', a cross slot, a pattern formed by randomly rotating the three rectangles or the four rectangles left and right.

6. The dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna as claimed in claim 1, wherein the microstrip line width of the bottom feed network is calculated by tx-line software.

7. The dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna as claimed in claim 1, wherein the number of the coaxial probes is two, the upper end surfaces of the coaxial probes are respectively welded and fixed with the two dielectric resonant feed plates, and the lower end surfaces of the coaxial probes are flush with the lower surface of the dielectric substrate and connected with the bottom feed network.

8. The dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna as claimed in claim 1, wherein for the first port and the fourth port, due to the phase difference between the two ports being 0 ° and 180 °, horizontal linear polarization (x-LP) or vertical linear polarization (y-LP) is achieved by changing the feed port, resulting in an apple-like radiation pattern and a circular radiation pattern, achieving a reconfigurable radiation mode; for the second port and the third port, the circular polarization can be realized through the phase difference realized by the circular microstrip line, the reconfiguration between the left-hand circular polarization mode and the right-hand circular polarization mode can be realized by changing the feed port, and the feed ports with different polarizations are switched to ensure that the antenna realizes the reconfigurable function of the polarization mode.

Technical Field

The invention belongs to the field of wireless communication, and particularly relates to a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna.

Background

Dielectric resonant antennas have been widely studied for use in the past few decades because they are composed of low-loss microwave dielectric materials, the resonant frequency of which is determined by the size, shape and relative permittivity of the resonator.

The existing research work has mainly focused on linear polarized dielectric resonator antennas, while circular polarized dielectric resonator antennas have received much attention due to their ability to provide more stable links and to resist multipath distortion. Year 2018, 13/6, the 3GPP conference in san diego sets the first international 5G standard, which includes two spectral ranges: FR1 is from 450MHz to 6000MHz, commonly known as Sub-6GHz and FR2 is from 24250MHz to 52600 MHz. Based on this standard, more antennas operating in the relevant frequency bands will be studied and designed.

Dielectric Resonator Antennas (DRAs) have the advantages of high efficiency, wide bandwidth, easy excitation, compact size, high design freedom, etc., and have attracted considerable attention in modern wireless communication systems. The basic shape of the dielectric resonator block has many options, such as rectangular, cylindrical or hemispherical, and the design has great flexibility. The dielectric constant is chosen over a wide range (6-140), allowing the designer flexibility in controlling size and bandwidth; the dielectric resonator antenna radiates through the whole resonator surface, has no conductor and surface wave loss, has small dielectric loss and high radiation efficiency. The antenna has many feeding modes, including probe feeding, slot coupling feeding, microstrip line feeding, coplanar waveguide feeding, dielectric mirror waveguide feeding and the like, and the feeding technologies of other antennas are easily applied to the dielectric resonator antenna, so that various modes can be excited, and broadside or conical radiation modes can be generated according to different covering requirements. The dielectric resonator antenna is simple to process, low in cost and convenient to integrate and design. Based on the advantages, the dielectric resonant antenna is widely applied to the fields of radar systems, mobile satellite communication, phased array antennas and the like, and shows potential application value in 5G application.

The reconfigurable antenna is also a research hotspot of the dielectric resonant antenna, and since the research project of RECAP reconfigurable is proposed and established by the national defense advanced research program office in 1999, the reconfigurable antenna can greatly reduce the number of devices in the system and reduce the complexity, the volume and the cost of the system, so that the reconfigurable antenna becomes an important development direction in wireless communication, satellite communication, imaging and detection systems. The reconfigurable technology brings variable working frequency, and the software-defined base station and the intelligent radio frequency system can adapt to working scenes of multiple users, multiple standards and multiple frequency bands. The reconfigurable characteristic of the antenna is achieved by changing the current distribution on the antenna by using some existing techniques, thereby changing the electromagnetic field distribution around the antenna.

The reconfigurable antenna is divided into a frequency reconfigurable antenna, a directional diagram reconfigurable antenna, a polarization reconfigurable antenna and a multi-electromagnetic parameter reconfigurable antenna according to functions. One or more of various parameters such as frequency, lobe pattern, polarization mode and the like of the antenna can be reconstructed by changing the distribution, physical structure, feed network or radiation edge of the surface current of the reconfigurable antenna, so that the reconfigurable antenna adapts to the change of environment and the complex system requirement.

Disclosure of Invention

The invention provides a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna, which aims at solving the problems that the existing reconfigurable dielectric resonant antenna can only realize one reconfigurable function and the bottom feed network is complex, and can realize the reconfiguration of a polarization mode and a radiation mode.

The four-port reconfigurable dielectric resonant antenna sequentially comprises a circular dielectric resonant block, two layers of dielectric resonant blocks, a dielectric resonant feed plate, a dielectric substrate, a coaxial probe and a bottom feed network from top to bottom;

further replacing the two layers of dielectric resonance blocks with three layers of dielectric resonance blocks or four layers of dielectric resonance blocks;

the dielectric resonance feeding plates are symmetrically arranged at the left side and the right side below the top circular dielectric resonance block and are fixed with the dielectric substrate through soldering tin to support the circular dielectric resonance block.

A copper foil patch is pasted on the surface of the dielectric resonance feed plate through a conductive adhesive; and a through hole is formed at the position where the outer side of the dielectric resonance feed plate is connected with the dielectric substrate and is used for penetrating through the coaxial probe. The number of the coaxial probes is 2, the upper end surfaces of the coaxial probes are respectively welded and fixed with the two dielectric resonance feed plates, and the lower end surfaces of the coaxial probes are flush with the lower surface of the dielectric substrate and connected with a bottom feed network;

the two layers of dielectric resonance blocks comprise upper and lower layers of dielectric resonance blocks with the same size and different dielectric constants, and are adhered together through conductive adhesive; the dielectric constant of the upper dielectric resonance block is larger than that of the lower dielectric resonance block; the two layers of dielectric resonance blocks are circular, the radius of the two layers of dielectric resonance blocks is smaller than that of the top circular dielectric resonance block, and the centers of the two layers of dielectric resonance blocks are coincident.

The upper surfaces of the two layers of dielectric resonance blocks and the lower surface of the top round dielectric resonance block have no requirement; the lower surfaces of the two layers of dielectric resonance blocks are fixed at the center of the upper surface of the dielectric substrate, and a gap is reserved between the lower surfaces of the two layers of dielectric resonance blocks and the dielectric substrate;

the method specifically comprises the following steps:

the upper surface of the dielectric substrate is provided with a copper coating, however, four small rectangular blanks are reserved on the dielectric substrate at the center under the two layers of dielectric resonance blocks to serve as gaps, which is equivalent to introducing a second resonance structure, and the working frequency range of the gaps and the dielectric resonance blocks are positioned in the same range by adjusting the size of the gap strips, so that the purpose of expanding the bandwidth is realized.

The shape of the gap is a pattern formed by arbitrary left-right rotation of a cross-shaped gap or four rectangles;

the dielectric substrate is a rectangular plate, and the bottom of the lower surface is distributed with a feed network. The medium substrate adopts a four-port excitation mode, a port is arranged on each corner, and the ports are named as a first port, a second port, a third port and a fourth port along the clockwise direction.

Each port of the bottom feed network is respectively connected with a microstrip line and a corresponding extension line, the first port and the fourth port are connected with the orthogonal coupling feed network through the respective extension lines, and the two ports are respectively connected with a coaxial probe in the through hole at the tail end of the extension line of the microstrip line; the second port and the third port are connected with the semicircular microstrip line structure through extension lines.

Further calculating the microstrip line width of the bottom feed network through tx-line software;

and feeding through the first port, wherein the difference between the length of the microstrip line between the first port and the coaxial probe and the length of the microstrip line between the fourth port and the coaxial probe is 0, and the phase difference between the corresponding first port and the corresponding fourth port is 0 degree.

Feeding through the fourth port, the difference between the length of the microstrip line between the first port and the coaxial probe and the length of the microstrip line between the fourth port and the coaxial probe is 1/2 λ, and the corresponding phase difference between the arrival at the first port and the arrival at the fourth port is 180 °.

The circular dielectric resonance block is connected with a bottom feed network through a coaxial probe connected with the dielectric resonance feed plate, and then the bottom feed network is correspondingly connected with a first port and a fourth port of the dielectric substrate, so that excitation linear polarization is realized;

the microstrip line extension lines corresponding to the second port and the third port are bent or the positions of the microstrip line extension lines are adjusted, so that the structure of the bottom feed network and the two layers of dielectric resonance blocks above the bottom feed network are positioned in the center of the dielectric substrate, the two layers of dielectric resonance blocks realize coupling feed with the bottom feed network through a copper-plated layer gap, and the bottom feed network is correspondingly connected with the second port and the third port of the dielectric substrate, so that circular polarization excitation is realized.

For the first port and the fourth port, since the phase difference between the two ports is 0 ° and 180 °, horizontal linear polarization (x-LP) or vertical linear polarization (y-LP) is achieved by changing the feed port, resulting in an apple-like radiation pattern and a circular radiation pattern, enabling a reconfigurable radiation mode. For the second port and the third port, the phase difference realized by the circular microstrip line can realize circular polarization, so that the antenna realizes the function of reconfigurable polarization mode.

The invention has the advantages that:

1. the invention relates to a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna, which adopts a multi-port excitation form in the same antenna structure to excite different ports to realize multiple resonant modes.

2. The invention relates to a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna. Meanwhile, gaps after optimized design are introduced to the copper-plated layer of the dielectric substrate, and the bandwidth is increased.

3. The invention relates to a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna, which adopts an improved hybrid orthogonal coupling network and a microstrip line extension line with a circular structure as a bottom feed network, provides a stable phase difference, uses a PCB (printed Circuit Board) printing technology to print the feed network on FR-4, and uses 3D (three-dimensional) printing for processing, thereby achieving the purposes of low cost and easiness in processing and manufacturing.

4. According to the double-linear polarization and double-circular polarization four-port reconfigurable dielectric resonant antenna, coupling between ports is reduced by introducing the dielectric resonant blocks with multiple dielectric layers and reasonable layout and design.

5. According to the double-linear polarization and double-circular polarization four-port reconfigurable dielectric resonant antenna, the radiation mode reconfiguration of linear polarization in the horizontal and vertical polarization directions is realized by changing the feed port, the mode reconfiguration of circular polarization between left-hand rotation and right-hand rotation is realized, and the polarization mode reconfiguration between circular polarization and linear polarization is realized.

Drawings

Fig. 1 is a schematic structural diagram of a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna according to the present invention;

FIG. 2 is a schematic structural diagram of a bottom feed network of a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna according to the present invention;

FIG. 3 is a schematic diagram of a copper-plated layer slot structure of a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna according to the present invention;

fig. 4 shows the main polarization and cross polarization radiation patterns of the e-plane and the h-plane when different ports of the dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna are fed according to the embodiment of the invention; wherein fig. 4a is a second port radiation pattern, fig. 4b is a third port radiation pattern, and fig. 4c is a fourth port radiation pattern;

fig. 5 is a diagram of different port feed S parameters of a dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonator antenna in the embodiment of the present invention.

In the figure:

1-a circular dielectric resonator block; 2-two layers of dielectric resonator blocks; 3-a dielectric resonant feed plate; 4-a first port; 5-a fourth port; 6-a second port; 7-a third port; 8-a dielectric substrate; 9-a through hole; 10-a coaxial probe; 11-microstrip line extension.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The double-linear polarization and double-circular polarization four-port reconfigurable dielectric resonant antenna provided by the invention integrates multiple functions in the same antenna structure, and is an innovative and challenging structure; circular dielectric resonator block and multi-dielectric-layer dielectric resonator block structures are used, and a gap is introduced on a copper-plated layer of a dielectric substrate to increase bandwidth. In addition, the improved hybrid orthogonal coupling network and the extension line of the circular microstrip line are used for providing stable phase difference, and meanwhile, the reconfigurable radiation mode and the reconfigurable polarization mode in two polarization directions are realized.

A dual-linear polarization and dual-circular polarization four-port reconfigurable dielectric resonant antenna is structurally shown in figure 1 and sequentially comprises a circular dielectric resonant block 1, two layers of dielectric resonant blocks 2, a dielectric resonant feed plate 3, a dielectric substrate 8, two coaxial probes 10 and a bottom feed network from top to bottom;

further, the two-layer dielectric resonance block 2 is replaced by a three-layer dielectric resonance block or a four-layer dielectric resonance block.

The dielectric resonance feeding plates 3 are symmetrically arranged at the left side and the right side below the circular dielectric resonance block 1, and the dielectric resonance feeding plates 3 are fixed with the dielectric substrate 8 through soldering tin to support the circular dielectric resonance block 1. A copper foil patch is pasted on the surface of the dielectric resonance feed plate 3 through a conductive adhesive; and a through hole 9 is formed at the position where the outer side of the dielectric resonance feed plate 3 is connected with the dielectric substrate 8 and is used for penetrating through the coaxial probe 10. The number of the coaxial probes is 2, the upper end surfaces of the coaxial probes are respectively welded and fixed with the two dielectric resonance feed plates 3, and the lower end surfaces of the coaxial probes are flush with the lower surface of the dielectric substrate 8 and connected with a bottom feed network 11;

the dielectric substrate 8 is a rectangular plate, the upper surface of the dielectric substrate is provided with a copper coating, two layers of dielectric resonance blocks 2 are fixed in the center of the upper surface, the two layers of dielectric resonance blocks 2 are circular and comprise upper and lower layers of dielectric resonance blocks with different dielectric constants, and the dielectric constant of the upper layer of dielectric resonance block is greater than that of the lower layer of dielectric resonance block; the two layers of dielectric resonance blocks 2 are fixed together through conductive adhesive, the radius of the two layers of dielectric resonance blocks 2 is smaller than that of the circular dielectric resonance block 1, and the circle centers of the two layers of dielectric resonance blocks are coincident.

The upper surfaces of the two layers of dielectric resonance blocks 2 are attached to the lower surface of the circular dielectric resonance block 1 or gaps are reserved between the upper surfaces of the two layers of dielectric resonance blocks;

an air gap without copper plating is reserved between the lower surface of the two layers of dielectric resonance blocks 2 and the dielectric substrate 8, which is equivalent to introducing a second resonance structure, and the working frequency band of the gap and the dielectric resonance blocks are positioned in the same range by adjusting the size of the gap, so that the purpose of expanding the bandwidth is realized.

As shown in fig. 3, the shape of the gap is a pattern formed by arbitrary left-right rotation of a cross-shaped gap, a cross-shaped gap or four rectangular blank gaps; the four rectangular blank slits may be replaced with three rectangular blank slits.

As shown in fig. 2, the dielectric substrate 8 is provided with a 50 ohm SMA coaxial port at each of the four corners, designated as a first port 4, a second port 6, a third port 7 and a fourth port 5 in the clockwise direction.

The bottom feed network on the lower surface of the dielectric substrate 8 is composed of an improved orthogonal coupling feed network, a semicircular microstrip line and an extension line, and is of a four-port extension line structure. Calculating the width of the bottom microstrip line by tx-line software;

the improved orthogonal coupling feed network is that: the extension lines 11 corresponding to each port are respectively added, the difference of the lengths of the extension lines 11 can cause the phase difference of the ports, and the difference of the length of the microstrip line between the first port 4 and the through hole and the length of the microstrip line between the fourth port 5 and the through hole are respectively 0 and 1/2 lambda, so that the phase is further adjusted to achieve the stable phase difference between the first port and the fourth port of 0 DEG and 180 deg.

Because the positions of the through holes 9 are symmetrical, if the lengths of the microstrip line extension lines 11 of the ports are kept different, the bending angles and the positions of the microstrip line extension lines 11 need to be adjusted, so that the bottom feed network and the upper dielectric resonance block are ensured to be positioned in the center of the dielectric substrate 8, and the tail ends of the microstrip lines are directly connected with the upper dielectric resonance block through the coaxial probes 10 for feeding.

The four-port extension line structure is respectively connected with the first port 4, the second port 6, the third port 7 and the fourth port 5 correspondingly, and the specific corresponding relationship is as follows:

the circular dielectric resonance block 1 is connected with a bottom feed network through a coaxial probe 10 connected with the dielectric resonance feed plate 3, and then a microstrip line extension line 11 of the bottom feed network is correspondingly connected with a first port 4 and a fourth port 5 of a dielectric substrate 8, so that excitation linear polarization is realized; the two layers of dielectric resonance blocks 2 are mutually coupled with the bottom feed network through a gap on the copper-plated layer, and then a microstrip line extension line 11 of the bottom feed network is correspondingly connected with the second port 6 and the third port 7 of the dielectric substrate 8, so that circular polarization excitation is realized.

For the first port 4 and the fourth port 5, as the phase difference between the two ports is 0 ° and 180 °, horizontal linear polarization (x-LP) or vertical linear polarization (y-LP) is achieved by changing the feed port, resulting in an apple-like radiation pattern and a circular radiation pattern, achieving a reconfigurable radiation mode. For the second port 6 and the third port 7, the circular polarization can be realized by the phase difference realized by the circular microstrip line, and the reconfiguration of the left-hand circular polarization and the right-hand circular polarization can be realized by changing the feed port. Meanwhile, the feed port is changed, so that the antenna can be switched between circular polarization and linear polarization, and the reconfigurable function of the polarization mode is realized.

The antenna is preliminarily designed to integrate the two functions of polarization or mode reconfiguration, so that the antenna can be switched among left-hand circular polarization (LHCP), right-hand circular polarization (RHCP), x-direction linear polarization (x-LP) and y-direction linear polarization (y-LP), and the antenna realizes the function of full polarization reconfiguration.

The bottom feed network designed by the invention realizes various reconstructions by feeding different ports, reduces the coupling among the ports by reasonable layout and design, finds that certain coupling exists among the ports in actual simulation design, introduces DRA with a multi-dielectric-layer structure by replacing a feeding mode to realize the difference of polarization modes, and can effectively reduce the coupling among different ports.