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Three-dimensional band absorption-type absorptive frequency selective structure

A frequency selective, absorptive technology for microwave applications

Active Publication Date: 2019-02-01
嘉兴诺艾迪通信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each periodic structural unit is formed by stacking upper and lower layers of parallel plate waveguides

Method used

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  • Three-dimensional band absorption-type absorptive frequency selective structure
  • Three-dimensional band absorption-type absorptive frequency selective structure
  • Three-dimensional band absorption-type absorptive frequency selective structure

Examples

Experimental program
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Embodiment

[0036] The present invention adopts the method of stacking two layers of parallel plate waveguides to build a three-dimensional band-absorbing AFSS, which can realize low-pass characteristics and generate an extremely wide absorbing band near high frequencies.

[0037] like figure 1 , 2 As shown, the three-dimensional band-absorbing AFSS based on the stepped impedance parallel-plate waveguide is a periodic structure, and each periodic structure unit includes two upper and lower layers of parallel-plate waveguides.

[0038] The upper parallel plate waveguide includes a first metal surface 1, a second metal surface 6, a first metal wire 2, a second metal wire 7, a first capacitor 3, a second capacitor 8, a first resistor 4 and a second resistor 5; the first capacitor 3 and the first resistor 4 are connected to the first metal surface 1 and the second metal surface 6 through the first metal wire 2; the second capacitor 8 is connected to the first metal surface 1 and the second m...

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PUM

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Abstract

The invention discloses a three-dimensional band absorption-type absorptive frequency selective structure, which is a periodically distributed structure. A structure unit adopts a mode of stacking oftwo layers of step-impedance parallel plate waveguides, loading of lumped capacitors and resistors is combined, and the performance of low-frequency wave transmission and high-frequency wave absorption is realized. The structure unit is composed of an upper parallel plate waveguide and front and rear loading parts, and a lower parallel plate waveguide and the rear loading part. The structure disclosed in the invention can be used for a stealth radome of a low frequency antenna in a military field. The three-dimensional band absorption-type absorptive frequency selective structure can transmitelectromagnetic waves at low frequencies without loss and can realize the wave absorption function in a wide frequency band at high frequencies, thereby reducing reflection of out-of-passband electromagnetic waves and realizing good stealth characteristics.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a three-dimensional band-absorbing type frequency selection structure based on a ladder impedance parallel plate waveguide. Background technique [0002] Frequency selective surface (FSS) is a spatial filter composed of periodically arranged structural units, which can effectively control the transmission and reflection characteristics of electromagnetic waves of different frequencies. In the military field, it can be used for stealth radome. By changing the shape, the reflected wave of the opponent's radar deviates from the incident direction, thereby reducing the radar cross section (Radar Cross Section, RCS) of the antenna. However, this reduction is only for single-station RCS. [0003] Absorbing frequency selective surface (Absorptive Frequency selective surface, AFSS) can be regarded as the combination of traditional frequency selective surface and absorber, which has bot...

Claims

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Application Information

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IPC IPC(8): H01P1/20
CPCH01P1/20
Inventor 俞钰峰罗国清俞伟良廖臻潘柏操童剑
Owner 嘉兴诺艾迪通信科技有限公司
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