A Dual-Polarized C-X-Ku-Band Frequency-Selective Rasorber With Wide High-Transmission Passband

A dual-polarized C-X-Ku-band frequency-selective rasorber (FSR) with a wide high-transmission passband is proposed in this letter. The proposed FSR is formed by cascading an lossy layer with inner-gate cross frame and a nonresonant lossless layer. This structure can simultaneously achieve polarization insensitivity, angular stability and wideband performance. The simulation results show that the transmissivity of −1 dB ranges from 10.10 to 13.01 GHz, with a fractional bandwidth of 25.2%. The reflectivity below −10 dB ranges from 4.19 to 17.81 GHz, with a fractional bandwidth of 123.8%. The stable absorption and transmission characteristics in dual-polarization mode are maintained up to 30 <tex-math notation="LaTeX">^∘</tex-math> . A prototype of the proposed FSR is fabricated and the measurement agrees well with the simulation. The proposed design can be a desirable scheme for broadband antennas enclosed by stealth radomes.