Miniaturized reconfigurable frequency selective surface with high selection characteristic and application

Abstract

The invention discloses a miniaturized reconfigurable frequency selective surface with a high selection characteristic and application, the miniaturized reconfigurable frequency selective surface comprises M * N periodically arranged two-dimensional resonance units, and each two-dimensional resonance unit comprises four layers of dielectric substrates and five layers of metal patches which are sequentially stacked from top to bottom; the first and second layers of metal patches and the first layer of dielectric substrate form an active parallel plate capacitor structure unit; the fourth layer of metal patch, the fifth layer of metal patch and the fourth layer of dielectric substrate form a passive parallel plate capacitor structure unit; and the active parallel plate capacitor structure unit and the passive parallel plate capacitor structure unit are cascaded, so that in-band flatness and out-of-band edge steep drop of a passband are realized, and high-frequency selection is realized. According to the invention, the defects of large unit size, insufficient out-of-band rejection, fixed FSS performance and single function are overcome; the antenna housing has the advantages of being high in passband selectivity, wide in stop band frequency band, small in size and low in profile, and the direct-current feed network is convenient to process. The antenna housing can be applied to antenna housing design in equipment with communication and radar stealth performance requirements.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to a miniaturized reconfigurable frequency selective surface based on a radome with high selectivity passband / wide stopband, which can be applied to radar systems or communication systems on aircraft, cruisers and missiles, etc. Radome design in . Background technique [0002] Frequency Selective Surface (FSS) is an array structure composed of a large number of identical units arranged in two-dimensional periodicity. Make a frequency selection. Due to the unique spatial filtering characteristics of FSS, it is widely used in electromagnetic stealth, radar absorbing materials, electromagnetic shielding and other aspects. [0003] Bandpass FSS is usually used in radome to achieve the purpose of reducing the radar cross section (Radar CrossSection, RCS) of the antenna system. Radar antennas are usually an important source of scattering in military systems. Conventional...

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Problems solved by technology

[0016] The purpose of the present invention is to solve the above-mentioned defects that exist in the prior art, to make up for the relatively large size of the reconfigurable frequency selective surface, the poor selection characteristics of the passband (flat passband, steep sideband, out-of-band suppression, etc.) and Insufficient in multi-band characteristics, and the shielding characteristics of the stop band, it provides a passband / stopband switching function and the two states have high selective bandpass and ultra-wideband reflection characteristics, and has a miniaturized low profile Frequency-selective surfaces of properties and reconfigurable properties

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