Frequency selective surface structure with wide passband and ultra-wide stopband

Abstract

The invention relates to a frequency selective surface structure with wide passband and ultra-wide stopband. The frequency selective surface structure comprises a fine square ring array layer, a spiral meander line array layer and a thick square ring array layer, wherein the fine square ring array layer is etched on an upper surface inner side dielectric plate, the spiral meander line array layer is etched on an intermediate metal layer lower side dielectric plate, the thick square ring array layer is etched on a lower surface outer side dielectric plate, an upper side foam material interlayer is further arranged between the upper surface inner side dielectric plate and the intermediate metal layer lower side dielectric plate, and a lower side foam material interlayer is further arranged between the intermediate metal layer lower side dielectric plate and the lower surface outer side dielectric plate. The frequency selective surface structure has the advantages of small unit size, small thickness, low transmission loss, wide passband, good out-of-band rejection, further has the beneficial effects of ultra-wide stopband, wide electromagnetic wave scanning angular domain and stable scanning along azimuth angle of frequency response, and can be widely applied to antenna housing design in platforms such as radars, satellite communication and aircrafts.

Description

technical field [0001] The invention relates to the technical field of frequency selective surface radome, in particular to a wide passband ultrawide stopband frequency selective surface structure. Background technique [0002] In modern communication, radar, aircraft and electronic countermeasure systems, antennas are often required to have a certain operating frequency bandwidth, and it is hoped that there is a certain suppression of electromagnetic signals that do not need frequencies outside the operating frequency band of the antenna, that is, anti-interference ability. Therefore, in these systems, it is usually required that the frequency selective surface radome used has the characteristics of low insertion loss, wide scanning angle and good angular stability in the passband, so as not to affect the original radiation performance of the antenna as much as possible; Out-of-band requires excellent broadband or even ultra-wideband out-of-band suppression effect, which ca...

AI Technical Summary

Problems solved by technology

[0003] However, most of the existing studies focus on the transmission ability of the frequency selective surface to electromagnetic waves within the operating frequency range, the transmission bandwidth is usually limited, and there is little discussion on the out-of-band suppression effect.

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