Abstract
This article presents a bandpass filter with second harmonic suppression using nonuniform open stubs.The proposed bandpass filter uses the nonuniform open stub instead of the uniform open stub to suppress the second spurious harmonic frequency. The nonuniform open stub consists of two serial combined stepped impedance resonators with different characteristic impedances and different electrical lengths. The use of nonuniform open stubs improves the second harmonic suppression. The proposed bandpass filter using nonuniform open stub provides the broad bandwidth outside the passband without external circuits. The proposed bandpass filter has a return loss below 10 dB from 2.42 to 2.54 GHz and improved second harmonic suppression of 48 dB at 4.54 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1451–1453, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27640
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