Abstract
This paper reports a dual-polarized graphene-based multi-functional device which could switch between rasorber and absorber flexibly. The only difference between rasorber and absorber is that rasorber has a transmission window with low loss. Therefore, a wideband absorber is proposed at the first step. Then, four split-ring resonators (SRRs) are introduced to the absorber, which makes the electromagnetic (EM) energy could be reflected at the certain frequency band. The state (on/off) of SRRs and absorber can be controlled by the chemical potential of graphene. To find a new pathway for this part of the reflected energy, metal ground of the absorber is replaced by a reconfigurable graphene-based frequency selective surface (FSS). The proposed FSS could be switched between FSS and metal plate by controlling the chemical potential of graphene ring embedded in the bottom metal layer. Therefore, the proposed multi-functional device could be obtained by combing the absorber with SRRs and reconfigurable FSS. When the proposed device serves as a rasorber, it has an absorption-transmission-absorption response with superior selectivity. When it performs as an absorber, it has wideband performance with high absorptive rate. It is an attractive candidate for stealth applications.
Highlights
Frequency selective surface (FSS) radome allows EM waves to transmit in the transmission band and reflect the EM waves out-of-band [1]–[3]
The final scattering parameters and the corresponding absorption rate of the proposed rasorber/absorber simulated by HFSS are displayed in Figs. 6(a-b) under TE polarization
The simulated 10-dB impedance bandwidth is 110.2% from 0.275 to 0.95 THz, meaning that EM waves could pass through or be absorbed within this frequency band. |S21| above −3dB means that these part of EM waves could pass through the proposed design with low insertion loss
Summary
Frequency selective surface (FSS) radome allows EM waves to transmit in the transmission band and reflect the EM waves out-of-band [1]–[3]. FSS can reduce mono-static radar cross section (RCS) greatly. The reflected wave by FSS increases scattering in other directions, which could be detected by bistatic/multistatic radar [4]. Frequency-selective rasorber has been studied since rasorber can pass EM waves in the passband and absorb EM waves outside the passband. By this way, both mono-static and bistatic out-of-band RCS can be reduced. Rasorber has superior performance over conventionally used FSS in reducing RCS
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