Switchable rasorber with high‐order frequency selective surface for transmission bandwidth extension

Abstract

Switchable rasorber operating between rasorbing and absorbing states can effectively improve its stealth performance within the passband. However, the existing switchable rasorbers utilize single‐order frequency selective surfaces (FSSs), limiting their transmission bandwidth. This work proposes a switchable rasorber with expanded passband utilizing high‐order FSS. First, the switching principle of high‐order FSS is presented, which is then used to design the rasorber with an extended transmission band. The simulated results and experimental verification of the proposed switchable rasorber are also presented. Compared with the existing switchable rasorbers, the proposed device demonstrates the widest fractional transmission bandwidth of 17% and a minimum insertion loss of 0.54 dB in rasorbing state. In the absorbing state, the passband is eliminated and the device exhibits a single absorption band with fractional bandwidth of 89.3%.

Design of a broadband switchable frequency selective rasorber/absorber

“…According to Fig. 3(a) that the passband with the insertion loss within 1dB is obtained in 3.87-4.95GHz (24.5%), the result is better than those of references 12 . And there is an absorbing band in 1.37-3.53GHz when the absorption rates are over 80%.…”

An ultra‐wideband polarization‐insensitive optically transparent band‐notched absorber

“…4 Due to the superior characteristics, frequency-selective absorbers (FSAs) have received more attention. 5 Unlike conventional absorbers, FSA not only has one or more absorption bands but also has a passband [6][7][8][9] or stopband. [10][11][12][13] FSA with passbands can provide low insertion loss transmission and out-of-band wave absorption.…”

Design of a Dual‐Band Waveform‐Selective Metasurface Absorber Based on the Combination of Two Resonator Structures Loaded with Nonlinear Circuits

“…Therefore, additional degrees of freedom must be introduced for easy adjustment to meet the requirements of different application scenarios. Subsequently, various nonlinear lumped elements incorporated into MSAs have been proposed to achieve dynamic tuning, [ 18–23 ] power protection, [ 24,25 ] and other characteristics. [ 26 , 27 ]…”

“…Currently, control over the power, operating frequency, or reconfigurable performance can be achieved by incorporating nonlinear elements such as PIN diodes or varactor diodes into the resonator structure of MSs. [ 20–29 ] For instance, Zhou et al. designed an energy‐selective surface by integrating PIN diodes.…”