Absorptive Frequency-Selective Reflector Based on Bent Metallic Strip Embedded With Chip-Resistor
Binchao Zhang, Cheng Jin, Zhongxiang Shen
Abstract
A new methodology for designing a dual-polarized absorptive frequency-selective reflector (AFSR) with wide reflection and absorption bands is proposed in this communication. The AFSR is made up by an array of interweaved bent metallic strips embedded with chip-resistors in the center on a metallic ground. The absorption- reflection-absorption response is obtained by generating multimode resonance with wave antinode and wave-node characteristics of the proposed structure. Four metallic strips are interweaved together to realize dual-polarized performance for its rotational symmetry characteristic. The designed AFSR is fabricated and measured, and the measured results agree well with simulation. It is shown that the measured fractional 3 dB reflection bandwidth is 46.2% between two absorption bands. In addition, the AFSR has stable performance for both TE and TM polarizations under various oblique incidence angles up to 40°, and the whole profile of the structure is only 0.076 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> , where λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> is the lowest frequency of the operating frequency band.