Abstract
In this study, a frequency-selective rasorber with a tunable passband and two absorptive bands is presented. It is designed using two active FSSs, an absorptive FSS realized with tripole elements, and a lossless bandpass FSS achieved with ring slots. Both active FSSs embedded with varactors realize the shift of transmission frequency bands by controlling the bias voltage of the feed network. The working principle is briefly investigated according to an equivalent circuit model. A prototype is fabricated and measured to verify the simulated results, which show that a passband is tuned from 3 to 4.78 GHz between two absorptive bands, and the maximum band of |S11| < −10 dB covers from 2.2 to 7.96 GHz.
Highlights
Frequency-selective surfaces (FSSs) with both absorptive and transmissive bands have attracted much attentions in recent years because they transmit the in-band EM waves and absorb the out-of-band signals [1,2,3]. ey are called as frequency-selective rasorber (FSR) or absorptive/transmissive frequency-selective surface (ATFSS)
Some FSRs have been reported by cascading one sheet of lossy FSS which provides an absorptive feature in absorptive bands and another layer of lossless FSS which serves as a passband filter
Different structures have been utilized for designing the lossy FSS, while different slot-shape unit cells have been used for the lossless FSS [4,5,6,7,8]
Summary
Frequency-selective surfaces (FSSs) with both absorptive and transmissive bands have attracted much attentions in recent years because they transmit the in-band EM waves and absorb the out-of-band signals [1,2,3]. ey are called as frequency-selective rasorber (FSR) or absorptive/transmissive frequency-selective surface (ATFSS). Frequency-selective surfaces (FSSs) with both absorptive and transmissive bands have attracted much attentions in recent years because they transmit the in-band EM waves and absorb the out-of-band signals [1,2,3]. Some FSRs have been reported by cascading one sheet of lossy FSS which provides an absorptive feature in absorptive bands and another layer of lossless FSS which serves as a passband filter. Different structures have been utilized for designing the lossy FSS, while different slot-shape unit cells have been used for the lossless FSS [4,5,6,7,8]. Most of the published FSRs, including the category that realized using 3D structures [9,10,11], realized a fixed passband that can be lower or higher than an absorptive band or between two absorptive bands. It is necessary to actively tune the transmission bands
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