Abstract
A dual-mode bandpass filter with a high selective performance for dual-band application is presented in this article.The filter is designed with square loop resonator with tree-shaped patches attached to the four inner corners of the loop, which equivalents to load capacitors in the inner of loop resonator. This loading can reduce the size of filter. The input/output feed lines located along a straight line. Such a feed arrangement is physically suitable for certain microwave networks. A demonstrated filter with the dual-band operating at 1.6 and 2.08 GHz was designed. Simulated and measured results indicate that a high selective dual-mode dual-band filter with wide harmonic responses has been achieved. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:666–669, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25784
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