3-D polarization insensitive ultrawideband frequency selective rasorber with switchable transmission band

作者：Dai, Yilin; Ding, Fan; Jin, Jing; Cheng, Houyuan; Fu, Yang; Zhou, Xiaofeng; Yang, Helin^*

来源：Optics Communications, 2024, 550: 130000.

DOI：10.1016/j.optcom.2023.130000

• 3-D structure
• Frequency selective rasorber
• Polarization insensitive
• Switchable transmission band

A novel polarization insensitive ultrawideband frequency selective rasorber (FSR) based on a 3-D cubic structure is proposed, and the fundamental operating principles of the three parts are demonstrated by equivalent circuit models. The first one is a 3-D FSR based on the multiple resonant absorptions of the curved longer dipole and shorter dipole excitation in the resonance chamber and the insertion of the interdigital resonator (IR) structure in the shorter dipole to form a transmission The passband with an insertion loss of less than 3 dB is 10.3-12.9 GHz (22.4%), and the frequency bandwidth with a reflection coefficient of less than -10 dB ranges from 4.2 to 20.5 GHz (132%). The second is a reconfigurable frequency selective surface (FSS) with two operating states, and the third is a 3-D FSR with a switchable passband feature that incorporates the above two structures of loaded switching diodes.