Abstract
This article presents a compact dual-band bandpass filter (BPF) based on mixed electric and magnetic coupling. SIR is utilized to construct mixed electric and magnetic coupling by placing the low-impedance stubs and the high-impedance stubs closely, respectively. A transmission zero can be generated and its location is determined by the dominant coupling. Detailed coupling mechanism has been analyzed. Dual-band response is realized by introducing two sets of SIRs and the two passbands can be designed independently owing to the two parallel signal paths. To further improve the frequency selectivity, source-load coupling is adopted in each path. Based on the transmission line theory and network acknowledge, the equivalent circuit of the proposed filter has been given and analyzed. To validate the approach, a dual-band BPF centered at 2.4/3.5 GHz has been fabricated. Good agreement is obtained between simulated and measured results. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1903–1907, 2014
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