Abstract
AbstractA modified compact stepped‐impedance hairpin resonator using an interdigital capacitor and its application to a bandpass filter design are presented. In comparison to the coupled line of a conventional stepped‐impedance hairpin resonator, the interdigital capacitor of the proposed resonator achieves a bigger parallel capacitance. Hence, the proposed resonator can achieve a compact size and a wider harmonic‐free bandwidth. Comparing the measured results of the two bandpass filters using the conventional resonators or the modified resonators suggests that the bandpass filter using the proposed resonators achieves a superior performance. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2007–2010, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23559
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