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High Performance Radar/Infrared Dual Band Bandpass Frequency Selective Surface

A frequency selective surface, high-performance technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., which can solve the problem that the multi-layer metal grid array structure cannot achieve radar/infrared dual-wave bandpass function, optical transmittance and shielding efficiency. Contradiction and other problems, to achieve the effect of optimizing optoelectronic characteristics, improving shielding efficiency, and realizing electromagnetic characteristics

Active Publication Date: 2016-11-30
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of single-layer optically transparent FSS optical transmittance and shielding efficiency, concentrated distribution of high-order diffraction energy in the prior art, and the multi-layer metal grid array structure cannot realize the radar / infrared dual-wave band-pass function, the present invention Provides a high-performance radar / infrared dual-band bandpass FSS

Method used

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  • High Performance Radar/Infrared Dual Band Bandpass Frequency Selective Surface
  • High Performance Radar/Infrared Dual Band Bandpass Frequency Selective Surface
  • High Performance Radar/Infrared Dual Band Bandpass Frequency Selective Surface

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Embodiment 1

[0028] When m=19, n=24, k=3, g=440μm, 2a=25μm, according to the constraints, we get figure 1 and figure 2 The periodic unit of the grid-shaped and circular-hole radar / infrared dual-bandpass FSS shown is based on the same line width of the metal grid, and the period of the metal grid of the double-layer optically transparent FSS is the period of the single-layer optically transparent FSS. When it is doubled, the transmittance of the two is basically the same, and the transmittance of the double-layer optically transparent FSS is designed to be 77%;

[0029] According to the shielding efficiency of the composite guidance window and the radar passband frequency, the thickness of the coupling dielectric is set. When the wavelength corresponding to the center frequency of the radar bandpass is λ, the electrical thickness of the coupling dielectric is the relative permittivity, d is the thickness of the coupling dielectric) is about 0.1λ~0.2λ, select ε r =4 . 803, the thickness...

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Abstract

The invention provides a high-performance radar / infrared dual-band bandpass FSS, which solves the contradiction between the optical transmittance and shielding efficiency of the single-layer optically transparent FSS in the prior art, the concentrated distribution of high-order diffraction energy, and the multi-layer metal grid array The technical problem that the structure cannot realize the radar / infrared dual-wave band-pass function belongs to the field of electromagnetic shielding technology. The FSS of the present invention includes two layers of the same optically transparent FSS and a coupling dielectric between the two layers of optically transparent FSS, the two layers of optically transparent FSS are parallel and symmetrical with respect to the coupling dielectric; A periodic array of cross holes on a polygonal metal grid or a square metal grid. While ensuring the light transmittance, the FSS of the present invention significantly improves the shielding efficiency, has a high cut-off degree, and can realize the band-pass transmission characteristics of flat top and steep cut-off.

Description

technical field [0001] The invention relates to a high-performance radar / infrared dual-band band-pass frequency selection surface, which belongs to the technical field of electromagnetic shielding. Background technique [0002] The grid structure frequency selective surface (FSS for short) with submillimeter-scale period and micrometer-scale line width shows different electromagnetic properties when electromagnetic waves of different wavelengths are incident: such as transparent state under visible light and infrared light , when the microwave wavelength is the same as the aperture FSS unit size, it also appears transparent, and for microwave and radio waves in other bands, it is equivalent to metallization, which realizes the isolation of internal and external electromagnetic waves, that is, prevents external electromagnetic interference. and internal electromagnetic leakage. However, in the prior art, single-layer optically transparent FSS, the contradiction between its s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
Inventor 徐念喜高劲松
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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