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A Broadband Wave-transmitting Frequency Selective Absorber Based on 2.5d Structure

A frequency-selective and wave-absorbing technology, applied in the field of artificial metamaterials, can solve the problems of sensitive incoming wave polarization, narrow wave-transmitting bandwidth of wave absorbers, and difficult 3D structure processing, so as to improve angular stability and reliability. Integration, widening -1dB transmission bandwidth, avoiding the effect of angle-sensitive characteristics

Active Publication Date: 2021-06-08
XIDIAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 3D structure has many disadvantages such as difficult processing, high processing cost, large finished product volume and sensitivity to incoming wave polarization.
However, there is still a big gap between the relative bandwidth of 30.3% and the working bandwidth of the broadband antenna system
In addition, the cascading of multiple resonators makes the structural unit larger in size, poor in angular stability, and difficult to apply in a limited space.
[0005] With the wide application of broadband antenna systems and the urgent need for single-station and dual-station RCS reduction in broadband antenna systems, the existing frequency-selective absorbers have narrow wave-transmission bandwidths and large unit sizes. The frequency selective absorber with wave, high angular stability and polarization-insensitive wide wave-transmission band (S21 is less than -1dB) is used in broadband radar antenna systems with stealth requirements, but it has not yet been realized to meet the stealth requirements of broadband antenna systems frequency selective absorber

Method used

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  • A Broadband Wave-transmitting Frequency Selective Absorber Based on 2.5d Structure
  • A Broadband Wave-transmitting Frequency Selective Absorber Based on 2.5d Structure
  • A Broadband Wave-transmitting Frequency Selective Absorber Based on 2.5d Structure

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Embodiment 1

[0028] Low scattering characteristics are an essential feature of advanced weapons and equipment. With the wide application of radar detection technology and multi-station radar, conventional stealth radome can only reduce the single-station RCS and cannot meet the stealth requirements of weapons and equipment. However, conventional absorbers do not have selectivity in the frequency domain, which seriously affects the working requirements of the antenna system for transmitting and receiving electromagnetic waves. Therefore, frequency-selective absorbers with frequency-selective characteristics have become a research hotspot in the field of stealth. However, in the prior art, the high-transmission bandwidth of the frequency-selective absorber is often narrow, which is contrary to the development trend of the broadband work of the airborne radar antenna system. Therefore, there are objective applications for the frequency-selective absorber with wide wave-transmission characterist...

Embodiment 2

[0034] The overall composition of the broadband wave-transparent frequency-selective absorber based on the 2.5D structure is the same as in Embodiment 1. In the present invention, the side length of the dielectric plate of the loss layer is a, 5mm≤a≤10mm, and the size of the dielectric plate is related to the wave-transparent work of the resonator. Frequency is related, the operating frequency of the resonator (that is, the center frequency of the wave-transmitting band of the present invention) is related to the 2.5D bent metal strip structure formed by bending the double-sided rounded metal patch along a right-angle path, when the length and width of the dielectric plate change , the 2.5D bent metal strip structure formed by bending the bilateral rounded metal patch along the right angle can also change accordingly.

[0035] The thickness of the lossy layer dielectric plate in the present invention is hd1, 0.25mm≤hd1≤2mm. The dielectric constant is j, 1.5≤j≤4.5. In this exa...

Embodiment 3

[0037] The overall composition of the broadband wave-transparent frequency-selective absorber based on the 2.5D structure is the same as in Embodiment 1. In the present invention, the side length of the dielectric plate of the loss layer is a, 5mm≤a≤10mm, and the size of the dielectric plate is related to the wave-transparent work of the resonator. Frequency is related, the operating frequency of the resonator (that is, the center frequency of the wave-transmitting band of the present invention) is related to the 2.5D bent metal strip structure formed by bending the double-sided rounded metal patch along a right-angle path, when the length and width of the dielectric plate change , the 2.5D bent metal strip structure formed by bending the bilateral rounded metal patch along the right angle can also change accordingly. In this example, side length a=10mm, thickness hd1=2mm, j=4.5.

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Abstract

The invention is a broadband wave-transparent frequency-selective absorber based on a 2.5D structure, which solves the problem of narrow wave-transmission bandwidth of the existing frequency-selective absorber. The frequency selective absorber is composed of a loss layer, a lossless layer and an air layer. Periodically arranged resonators are printed on the loss layer. Each resonator subunit rotates 90° and 180° along the center of the dielectric plate with 0° as the reference direction. ° and 270° positioning; each subunit has short and long single-sided rounded corners, double-sided rounded corners and rectangular metal patches of equal width; long and short single-sided rounded corners are printed alternately on the medium The same double-sided rounded metal patch on the upper and lower layers of the board forms a 2.5D bent metal strip along a right-angle bending path. The invention uses a 2.5D structure to form a right-angle bent metal strip structure, broadens the wave-transmission bandwidth of the frequency selective absorber, and realizes wide wave-transmission band, bilateral wave absorption, polarization insensitivity, angle stability and small unit size characteristics, and is suitable for Broadband antenna system with stealth requirements.

Description

technical field [0001] The invention belongs to the technical field of artificial metamaterials, and relates to a frequency selective absorber, specifically a broadband wave-transparent frequency selective absorber based on a 2.5D structure, which can be used in radar antennas, communication antennas and many other broadband applications with low scattering requirements. antenna system. Background technique [0002] Low scattering characteristics are one of the important evaluation indicators in the design of modern weapon equipment. The frequency-selective surface radome with bandpass characteristics has wave-transmitting characteristics in the working frequency band of the antenna, so as to ensure that the radiation characteristics of the antenna system are not affected. In the non-working frequency band of the antenna, this type of radome can reflect the incoming wave to other non-threatening directions, effectively reducing the single-site radar cross section (RCS) of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q15/0013H01Q15/0086H01Q17/008
Inventor 姜文杨泽芊刘鹏葛江诚洪涛孙红兵李小秋
Owner XIDIAN UNIV
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