A novel miniaturised dual-band bandpass filter using a single modified stepped impedance resonator (SIR) is presented. Some different shaped slots cutting on the middle patch of the SIR are adopted to improve the return loss in the two passbands and control the resonant frequencies. Meanwhile, the impedance ratio can be changed by changing L or W to tune the resonant frequencies. To improve the selectivity and achieve a high out-of-band rejection, source-load coupling is utilised. The simulated and measured results are presented and show good agreement.
This article presents a novel bandpass-response power divider with high frequency selectivity. The centrally stub-loaded resonators are applied to this power divider in order to provide bandpass-filtering frequency response. In addition, the presented power divider has three transmission zeros, which can be used to improve the frequency selectivity. The measured results demonstrate the good performance of the fabricated bandpass-response power divider with high selectivity. V C 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1560-1562, 2013; View this article online at wileyonlinelibrary.com.
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