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Design of UWB Bandpass Filter Using Stepped-Impedance Stub-Loaded Resonator

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2 Author(s)
Qing-Xin Chu ; Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China ; Xu-Kun Tian

In this letter, an ultra-wideband (UWB) bandpass filter (BPF) using stepped-impedance stub-loaded resonator (SISLR) is presented. Characterized by theoretical analysis, the proposed SISLR is found to have the advantage of providing more degrees of freedom to adjust the resonant frequencies. Besides, two transmission zeros can be created at both lower and upper sides of the passband. Benefiting from these features, a UWB BPF is then investigated by incorporating this SISLR and two aperture-backed interdigital coupled-lines. Finally, this filter is built and tested. The simulated and measured results are in good agreement with each other, showing good wideband filtering performance with sharp rejection skirts outside the passband.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:20 ,  Issue: 9 )