Wide Transmission Band Frequency-Selective Rasorber Based on Convoluted Resonator

Reconfigurable Frequency Selective Rasorber Covering Extremely Wide Transmission Frequency Range

“…Table 2 summarizes the comparison of the proposed device with other published reconfigurable rasorbers. The proposed device exhibits a maximum absorption bandwidth of 87.9%, comparable with the state-of-art maximum absorption bandwidth (88.09%) achieved in [28]. While the other reconfigurable rasorbers exhibit a single passband under all conditions, the proposed rasorber can be switched between modes with single, dual and triple transmission bands with at least one absorption band.…”

“…However, the resultant narrow transmission band is not favored in broadband applications. Although high-order FSS has also been used in rasorber design to achieve broad transmission bandwidth and fast roll-off characteristic [25], [28], the reciprocity of EM wave transmission within the passband degrades its stealth performance.…”

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

“…Rasorber consisting of frequency selective surface (FSS) and resistive layer can reduce the radar cross‐section (RCS) of antennas within its absorption band(s) while allows the radiated wave to transmit through within its passband 1‐14 . Since 2009, a number of rasorbers with narrow transmission band have been reported, in which absorption bands were achieved at the frequencies above (i.e., T‐A type), 1‐3 below (i.e., A‐T type) 4,5 and on both sides 6,7 (i.e., A‐T‐A type) of the transmission band.…”

“…Besides, rasorber with narrow but tunable passband was also reported, 14 making it suitable for frequency hopping applications. Moreover, high‐order FSSs 15,16 were utilized to design rasorbers with extended passband for wide‐band applications 11‐13 . However, due to the reciprocity of electromagnetic (EM) wave transmission, rasorber is nearly transparent to EM waves within its passband and the RCS of antenna cannot be suppressed.…”

Dual‐polarized frequency selective rasorber with dual absorption bands

“…Typically, an AFST is designed by using one of two concepts: the two‐dimensional frequency selective surface (2‐D FSS) and three‐dimensional frequency selective surface (3‐D FSS). Generally, the 2‐D FSS design generates limited resonance modes, and it is usually lack of ideal angular stability, which may lead to undesirable responses 9–14 . As for the 3‐D FSS‐based AFST design, it basically utilizes parallel structures, comprising of lossy and lossless resonators.…”