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Low-pass absorption type frequency selection structure of narrow transition zone

A narrow transition band and frequency selection technology, applied in the microwave field, can solve the problem of slow transition from wave transmission to wave absorption, and achieve the effects of reducing RCS, good stealth performance, and small size

Pending Publication Date: 2022-04-01
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0004] The existing low-pass AFSS transition band is too wide, making the transition from wave transmission to wave absorption very slow, so it is urgent to develop a transition band with as narrow a bandwidth as possible (transition from wave transmission to wave absorption as fast as possible), frequency selective characteristics Good Low Pass AFSS

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  • Low-pass absorption type frequency selection structure of narrow transition zone
  • Low-pass absorption type frequency selection structure of narrow transition zone
  • Low-pass absorption type frequency selection structure of narrow transition zone

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Embodiment Construction

[0043] The present invention is further analyzed below in conjunction with specific examples.

[0044] Such as figure 1 As shown, the low-pass AFSS with narrow transition band proposed by the present invention includes two parts. One part is a lossy layer, and the other part is a three-dimensional band-stop structure. An air gap is introduced between the lossy layer and the three-dimensional band-stop structure.

[0045] The top view of lossy layer 1 is as follows figure 2 As shown, the size of the lossy layer unit is 10×10 mm, and the details are shown in image 3 shown. The upper part is the first wave-absorbing surface, including the first bent metal wire 2 plated on the first dielectric substrate 1, the second bent metal wire 3 and the first radio frequency resistor 6 welded between the two metal wires. The lower part is the second wave-absorbing surface, which has the same structure as the first wave-absorbing surface. The first wave-absorbing surface is perpendicul...

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Abstract

The invention provides a low-pass absorption type frequency selection structure of a narrow transition zone. At present, reported low-pass absorption type frequency selection structures are not excellent in transition bandwidth and selectivity. The invention has a periodic structure. Each structural unit is composed of two parts, one part is a loss layer, and the other part is a three-dimensional band-stop structure. The loss layer adopts a radio-frequency resistor and a bent metal wire with a relatively large equivalent inductance value; and the three-dimensional band-stop structure adopts a metal strip printed on a dielectric substrate in the vertical direction. The whole structure has the characteristics of high-frequency wave absorption, low-frequency wave transmission and narrow transition zone. Performance indexes of the antenna housing are perfectly matched with performance indexes of a large number of ultra-wideband antennas which are applied to the military field and work in the VHF / UHF frequency band and antenna housings of frequency spectrum monitoring systems and the like, and the antenna housing has high applicability.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a low-pass absorption frequency selection structure with narrow transition band and insensitive to polarization. Background technique [0002] In the field of military equipment, Frequency Selective Surface / Structure (FSS) is often used as a radome to reduce the Radar Cross Section (RCS) and improve the stealth performance of combat platforms. The traditional FSS achieves the reduction of single-station RCS by deviating the radar reflected wave from the incident direction. However, it cannot solve the problem of dual-station / multi-station RCS reduction. In order to solve this problem, a new type of artificial electromagnetic structure combined with FSS and microwave absorber—Absorptive Frequency Selective Surface / Structure (AFSS) came into being. AFSS can realize the function of wave transmission in the pass band and wave absorption outside the pass band. [0003] Most curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00
Inventor 俞钰峰张聪会刘琦罗国清
Owner HANGZHOU DIANZI UNIV
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