CST – Computer Simulation Technology

A Novel Frequency Selective Surface with Controllable Bandwidth and Steep Rejection Skirt
Amir Khurrum Rashid, Zhongxiang Shen
IEEE Antennas and Propagation Society International Symposium, 2009. APSURSI '09.
June 2009
1 - 4
Frequency selective surfaces (FSS) are very popular for many important applications including sub-reflector of dual antennas, spatial filter in radomes, etc. Traditional FSS however suffer from poor selectivity because their response generally follows a Butterworth or a Chebysheff function where out-of-band attenuation increases monotonically to infinity. Even the multi-layer FSS designs follow an all-pole transfer function, and it is thus difficult to obtain high selectivity or an elliptic response curve. Only recently a new FSS with quasi-elliptic response was proposed in [1] that consists of two coupled dual-mode resonators. The dual-mode resonators have been realized through a cavity of substrate integrated waveguide (SIW). Similar approaches have already been used for high performance filters and the designs based on dual-mode resonators are known to exhibit elliptic response, e.g. see [2, 3]. Unfortunately, most of these design approaches cannot directly be applied to conventional FSS, as these designs are very specific to waveguide or microstrip line applications. In this paper we propose a novel FSS that shows high selectivity of response, along with an excellent control of bandwidth. It is based on a dual-mode resonator, yet the resulting structure is simple and easy to fabricate. Our structure effectively consists of a stack of printed circuit boards (PCB) where each board carries a one-dimensional periodic array of microstrip lines.

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