volume | PIER Journals

Abstract

A novel design of a sharp-attenuation ultra-wideband bandstop filter is presented in this paper, which is composed of two transmission lines (TLs) and four pairs of coupled-lines. The five transmission zeros in the stopband can improve the bandwidth and roll-off factor of the filter. To verify the design, the filter is manufactured on printed circuit board (PCB), and its performance is measured. The 10-dB stopband insertion loss bandwidth of the filter is 0.45-3.76 GHz (relative bandwidth 157%), with good frequency selectivity. The 20-dB attenuation rate on the lower side of the stopband is about 154.5 dB/GHz.

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Ms. Mengxin He

Dr. Xiaoying Zuo

Dr. Hang Mei

Dr. Yajian Li