Abstract
AbstractThis letter proposes a parallel coupled‐line bandpass filter (BPF) using the folded slotted ground structures (SGSs) to improve the wide stopband. It is shown that the designed folded SGS has a very small area in comparison of previous works. The folded SGS exhibits a dual stopband characteristic owing to the bandgap resonant characteristic of SGS to suppress the harmonic frequency of the parallel coupled‐line BPF. Good agreement with electro‐magnetic simulation and measurement is demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 159–162, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22065
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