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Switchable rasorber with high‐order frequency selective surface for transmission bandwidth extension
Author(s) -
Li Ruiming,
Hu Haoquan,
Tian Jing,
Jiang Bixiao,
Chen Bo,
Lei Shiwen
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32789
Subject(s) - passband , bandwidth (computing) , materials science , fractional bandwidth , limiting , transmission (telecommunications) , optoelectronics , optics , electronic engineering , computer science , band pass filter , engineering , telecommunications , physics , resonator , mechanical engineering
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%.