Abstract
AbstractA novel compact microstrip dual‐band bandpass filter (BPF) is developed with remarkably improved stopband characteristics. Two‐square open‐loop resonators are embedded in a U‐shaped resonator to achieve a significant size reduction of the filter. Meanwhile, a cross‐coupling between nonadjacent resonators is exploited to produce multiple transmission zeros in the stopbands of the filter. As a consequence, wide stopbands with sharp and large attenuations are obtained. Theoretical and measured frequency responses of the designed filter show a good agreement.© 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 618–620, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23154
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