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A super-compact dual-band bandpass filter using mixed lumped and distributed circuits

Jianmei Zhou, Jianxing Li, Yaxin Wen, Yi Ren and Kai-Da Xu

Journal of Electromagnetic Waves and Applications, 2025, vol. 39, issue 14, 1647-1658

Abstract: In this paper, a super-compact dual-band bandpass filter (SC-DBBPF) with wide 3-dB fractional bandwidth (FBW) is designed. The proposed SC-DBBPF comprises two sets of coupled-lines, one pair of short-circuited stubs, and one pair of open-circuited stubs, which are separated by three lumped capacitors. The mixed lumped and distributed circuits make the entire circuit more miniaturized. Based on the design of symmetric circuit structures, the circuit model of the proposed filter can be studied using the theory of lossless transmission lines and the odd- and even-mode methods. The frequency response of the SC-DBBPF can be obtained by MATLAB using impedance deduction of equivalent circuit. For verification, a prototype centered at 0.28 GHz and 1.3 GHz is fabricated, which occupies an area of only 0.029λg × 0.093λg (λg denotes guided wavelength at the first center frequency 0.28 GHz). Moreover, the insert losses are lower than 0.19 and 0.25 dB in the lower and upper bands respectively, while the return losses are both greater than 18 dB in the two passbands. The results of experiment are very consistent with theoretical calculations, circuit, and electromagnetic simulations, validating the concept of the proposed technique.

Date: 2025
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DOI: 10.1080/09205071.2025.2527320

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Journal of Electromagnetic Waves and Applications is currently edited by Mohamad Abou El-Nasr and Pankaj Kumar Choudhury

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