Abstract
This article presents a compact dual-band bandpass filter (BPF) using a pair of one-end shorted uniform-impedance resonators (SUIRs) and a single dual-mode resonator (DMR). A pair of SUIRs with mixed electric and magnetic coupling (MEMC) not only realizes the lower passband but also serves as the feeding lines with source-load coupling to excite the DMR to produce the upper passband. Four transmission zeros due to the cancelling effect of MEMC, harmonic effect, source-load coupling, and inherent property of DMR improve the passband selectivity, band-to-band isolation, and out-of-band rejection. As an example, a dual-band BPF operating at 1.57/2.4 GHz with compact size of 0.1λg × 0.127λg is designed and fabricated. The simulation agrees very well with measurement. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1537–1540, 2016
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