Abstract
We propose a novel compact bandpass filter having a mushroom with interlocked gap coupling on FR4 as a composite right- and left-handed structure. The physical size reduction is made possible by the zeroth-order resonance of the geometry. The stopband suppression >40 dB is obtained by creating transmission zeros implemented with open stubs at ports. The passband has insertion loss < 1.5 dB and return loss < −15 dB at WiMAX-band. The simulation and measurement validate the design. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:403–405, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27326
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