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Harmonic-rejected compact bandpass filter using dual-mode microstrip resonator with additional open stub

✍ Scribed by Tae-Soon Yun; Hee Nam; Byungje Lee; Jin-Joo Choi; Jin-Young Kim; Jong-Chul Lee

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
635 KB
Volume
52
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

In this article, a compact dual‐mode λ~g~/2 bandpass filter with the characteristic of harmonic rejection is designed and implemented.The second and third harmonics of the suggested bandpass filter are rejected by using the additional open stubs of the T‐type equivalent circuit for the quarter wavelength line. Also, the J‐inverter is investigated as functions of the impedance and electrical length of the open stub of dual‐mode λ~g~/2 resonator. From the results, the lower impedance of open stub of dual‐mode λ~g~/2 resonator is better for the good performance of the dual‐mode λ~g~/2 bandpass filter. The harmonic‐rejected dual‐mode λ~g~/2 bandpass filter shows the characteristic of suppression of harmonics until 8 GHz and the insertion and return losses of 0.96 and 18.89 dB, respectively, at the center frequency of 2.43 GHz. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2288–2291, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25457

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