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A Novel Three-Dimensional Wide Stop Band Low Pass Frequency Selective Structure

A technology of frequency selection and wide stopband, applied in the field of stealth radome, can solve the problems of narrow stopband, failure to meet the use requirements, and large insertion loss of passband

Active Publication Date: 2020-07-07
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the band-stop frequency selection structure has already had many design schemes, but the band-stop frequency selection structure designed in the past often has a very narrow stop band, or the insertion loss of the low-frequency part of the pass band is relatively large, which cannot meet the application requirements.

Method used

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  • A Novel Three-Dimensional Wide Stop Band Low Pass Frequency Selective Structure
  • A Novel Three-Dimensional Wide Stop Band Low Pass Frequency Selective Structure
  • A Novel Three-Dimensional Wide Stop Band Low Pass Frequency Selective Structure

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Embodiment Construction

[0019] The present invention is further analyzed below in conjunction with specific examples.

[0020] The present invention adopts the method of stacking double-layer impedance discontinuous parallel plate waveguides to build a three-dimensional wide stopband low-pass frequency selection structure, which can realize low-pass characteristics and generate an extremely wide stopband near high frequencies.

[0021] like figure 1 , 2 As shown, the three-dimensional wide stopband low-pass frequency selective structure is a periodic structure, and each structural unit includes a parallel plate waveguide with discontinuous upper layer impedance and a parallel plate waveguide with discontinuous lower layer impedance.

[0022] The upper layer impedance discontinuous parallel plate waveguide includes a first metal surface 1 and a second metal surface 2 .

[0023] The lower impedance discontinuous parallel plate waveguide includes a second metal surface 2 and a third metal surface 4, a...

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Abstract

The invention relates to a novel three-dimensional wide-stopband low-pass frequency selection structure. The traditional frequency selection structure is designed into the band-pass type frequency selection structure; the band-pass width of the structure is limited; furthermore, a low-frequency band is difficultly covered; even if low-frequency band-pass can be realized, the size of a real objectneeding to be designed is also very huge; and thus, the structure is inconvenient to use. According to the novel three-dimensional wide-stopband low-pass frequency selection structure disclosed by theinvention, by adoption of a two-layer parallel-plate waveguide stacking manner, the two-layer parallel-plate waveguide middle is designed into the impedance discontinuous parallel-plate waveguide; the frequency selection structure having low-pass characteristic is designed; and furthermore, the structure has very wide stopband frequency band at the adjacent high-frequency position.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a novel three-dimensional wide stopband low-pass frequency selection structure, which can be used as a stealth radome for low-frequency (VHF / UHF) antennas, and its potential application scenarios include integrated communication masts for warships, etc. Background technique [0002] In current military applications, using frequency-selective surfaces / structures as radomes is one of the effective ways to reduce the radar cross section, and this method can effectively improve the stealth performance of combat platforms. [0003] The frequency selective surface is essentially a spatial filter, which can screen electromagnetic waves of a specific frequency band, polarization mode, and incident angle, transmit the required electromagnetic waves, and reflect the unnecessary electromagnetic waves. Therefore, the radome developed by using the frequency selective surface can reflect the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00
CPCH01Q15/0026
Inventor 罗国清俞伟良俞钰峰廖臻金华燕
Owner HANGZHOU DIANZI UNIV
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