Abstract
This letter presents a novel dual-band bandpass filter using dual-mode open-loop resonator. Non-degenerate modes of the dual-mode resonator are excited by loading a center-loaded T-shaped stub and its nature is investigated through the even-odd mode analysis. Based on the aforementioned dual-mode resonators, a compact dual-band filter is designed. Results verify that the fabricated filter with the central frequencies of 1.8 and 2.4 GHz and the fractional bandwidth of 8.3 and 12.9% are obtained. Also, there are several transmission zeros located at both sides of each passband. It provides the filter with improved selectivity and stopband suppression. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2370–2372, 2012; View this article online at wileyonlinelibrary.com.. DOI 10.1002/mop.27080
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