volume | PIER Journals

Abstract

In this paper, a novel planar dual-band absorptive bandstop filter (ABSF) based on transmission lines is proposed. The filter structure is composed of multiple transmission lines and two chip resistors, which endows it with distinct advantages including multiple transmission zeros, high-selectivity dual-bandstop performance. Through formula derivations, the specific positions of the four transmission zeros within the operating frequency are precisely determined. Experimental measurement results demonstrate that the -10 dB fractional bandwidth of the first stopband is 50.27% (from 0.7 GHz to 1.17 GHz), while that of the second stopband reaches 13.18% (from 3.33 GHz to 3.8 GHz). Across the entire frequency, the insertion loss S₂₁ achieves a minimum of -45.20 dB at 1 GHz, and the return loss S₁₁ attains a maximum of -10.27 dB at 3.94 GHz. The physical dimensions of the filter are 102 mm × 26 mm (0.77λ₀ × 0.20λ₀).

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Dr. Jiapei Dong

Dr. Xiaoying Zuo

Ms. Mengxin He

Dr. Yajian Li

Dr. Juntao Cao

Dr. Zelin Sun