Design of a Broadband Frequency Selective Absorption and Transmission Structure

This paper designed a broadband Frequency Selective Rasorber (FSR). The Rasorber is mainly composed of top absorbing structure and bottom band pass frequency selective surface (FSS). The absorbing structure is a miniaturized orthogonal Jerusalem metal patch with an impedance device loaded in the middle, which can achieve good broadband absorbing efficiency at low frequency bands; Bandpass FSS is a coupled resonant structure, which not only has good passband flat top characteristics, but also has a good cut-off characteristics outside. After modeling analysis and scanning parameter optimization, the structural parameters are determined, and the absorption band of 4.2~11.2GHz and the transmission band of 11.8~17.8GHz are realized within the incident angle of 30°. The relative bandwidth of -10dB absorption is greater than 85%, and the relative bandwidth of - 3dB is more than 85%. The relative bandwidth of the wave is greater than 40%.