Double-frequency-band frequency selective surface reflector plate applied to reflector antenna

A frequency selective surface and reflector technology, applied in the field of electronics, can solve problems such as poor angle stability, resonant frequency shift, narrow passband bandwidth, etc., to overcome the instability of polarization characteristics and meet dual-frequency communication Requirements, good effect of dual-frequency communication requirements

Inactive Publication Date: 2013-06-12
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure still has disadvantages: first, the dual-frequency passband produced by the structure using the isomorphic unit has the same characteristic parameters, and the change of the size will change the characteristic parameters of the passband accordingly; second, the structure adopts two A unit with a similar shape, and the two are nested with each other, which will produce coupling characteristics; third, the structure has narrow passband bandwidth characteristics, and the angular stability is not very good
However, the disadvantage of this complementary frequency selective surface is that when the electromagnetic wave is obliquely incident, the resonant frequency will shift with the increase of the incident angle, and the frequency shift of high frequency is especially serious, which will affect the working performance of the frequency selective surface. Cannot meet the requirements of communication quality
However, the disadvantage of the hybrid frequency selective surface is that there is coupling between the structural units of the hybrid frequency selective surface. When the electromagnetic wave is obliquely incident, the resonant frequency will shift with the increase of the incident angle, which will affect the frequency. Choose the performance of the surface
However, the polarization-insensitive dual-frequency active frequency selective surface still has the disadvantage that because the frequency selective surface depends on loading the lumped device and the feed network, there are certain errors and service life in the production and processing of the lumped element, which requires regular maintenance;
[0007] The use of a feed network increases the complexity of the structure, and periodic deployment requires a complex feed network

Method used

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  • Double-frequency-band frequency selective surface reflector plate applied to reflector antenna
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  • Double-frequency-band frequency selective surface reflector plate applied to reflector antenna

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: The operating frequency of the reflector formed by m×n reflector units along the X and Y axis directions after period expansion is 20 / 44GHz, wherein the period expansion number of reflector units on the X axis is m=60, and the reflection The period extension number of plate units on the Y axis is n=40, and the center-to-center distance between adjacent reflector units is w=4.4mm.

[0034] The dielectric unit 3 is made of FR4 dielectric material with a length of l=4.4mm, a width of w=4.4mm, a thickness of h=2mm, and a dielectric constant of 4.4.

[0035] The center-to-center spacing between the ring patches 4 in the upper frequency selective surface unit 1 is w t =2.2mm, the outer radius of the ring patch 4 is r to =0.9mm, the value of inner radius is r ti = 0.72 mm. The side length of the square patch 5 in the lower frequency selective surface unit 2 is w=4.4mm, and the radius of the middle circular hole is r bo =2.1mm; the inner radius of the outer ri...

Embodiment 2

[0036] Embodiment 2: The operating frequency of the reflector formed by m×n reflector units along the X and Y axis directions is 15 / 33 GHz, where the number of period extensions of the reflector units on the X axis is m=50, and the reflection The period expansion number of plate units on the Y axis is n=40, and the center-to-center distance between adjacent reflecting plate units is w=8mm.

[0037] The dielectric unit 3 is made of FR4 dielectric material with a length of l=8mm, a width of w=8mm, a thickness of h=2.4mm, and a dielectric constant of 4.4.

[0038] The center-to-center spacing between the ring patches 4 in the upper frequency selective surface unit 1 is w t = 4mm, the outer radius of the ring patch 4 is r to =1.8mm, the value of inner radius is r ti = 1.5 mm. The side length of the square patch 5 in the lower frequency selection surface unit 2 is w=8mm, and the radius of the middle circular hole is r bo =3.9mm; the inner radius of the outer ring patch 7 is r ...

Embodiment 3

[0039] Embodiment 3: The operating frequency of the reflector formed by m×n reflector units along the X and Y axis directions after period extension is 14 / 28GHz, wherein the period expansion number of reflector units on the X axis is m=40, and the reflection The period extension number of plate units on the Y axis is n=40, and the center-to-center distance between adjacent reflecting plate units is w=10mm.

[0040] The dielectric unit 3 is made of FR4 dielectric material with a length of l=10mm, a width of w=10mm, a thickness of h=1.6mm, and a dielectric constant of 4.4.

[0041] The center-to-center spacing between the ring patches 4 in the upper frequency selective surface unit 1 is w t =5mm, the outer radius of the ring patch 4 is r to =2.3mm, the inner radius is 1.9mm. The side length of the square patch 5 in the lower frequency selection surface unit 2 is w=10mm, and the radius of the middle circular hole is r bo =4.3mm; the inner radius of the outer ring patch 7 is r ...

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Abstract

The invention discloses a double-frequency-band frequency selective surface reflector plate applied to a reflector antenna, which is mainly used for solving the problem that the angle stability can not be achieved due to the narrower bandwidth of the traditional reflector antenna. The reflector plate is formed by periodically continuing a reflector plate unit in directions of an X-coordinate and a Y-coordinate on which the reflector plate unit is located, wherein the reflector plate unit consists of a medium unit, an upper frequency selection surface unit and a lower frequency selection surface unit; the upper frequency selection surface unit consists of ring patches which are arranged according to a matrix, the lower frequency selection surface unit consists of a square-shaped patch and a vehicle-wheel-shaped patch, a hole is formed in the center of the square-shaped patch, and the vehicle-wheel-shaped patch is in central superposition with the square-shaped patch. According to the double-frequency-band frequency selective surface reflector plate disclosed by the invention, the bandwidth of a resonance frequency band is extended, the multi-angle stability is achieved, and the strength of signals in a communication frequency band is increased.

Description

technical field [0001] The invention belongs to the technical field of electronics, and further relates to a dual-band frequency-selective surface reflector for reflector antennas in the technical field of electromagnetic materials. The invention can be used in satellite communication, mobile communication, multi-feed and multi-frequency multiplexing reflection surface antenna and the like. Background technique [0002] The frequency selective surface can not only effectively control the reflection and transmission of the incident electromagnetic wave, but also perform frequency selection and polarization selection on the electromagnetic wave. Reflective characteristics, with spatial filtering function. In the microwave field, the important role of the frequency selective surface in the multi-band multiplexing system makes it applicable to the multiplexer of the frequency band of the communication satellite, and the reflector antenna of the multi-feed multi-frequency multip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/22
Inventor 姜文李成凯洪涛于松涛张扬邓兆斌龚书喜
Owner XIDIAN UNIV
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