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UWB bandpass filter with wide stopband using open stubs

✍ Scribed by Ru-Yuan Yang; Cheng-Yuan Hung; Yan-Kuin Su; Min-Hang Weng

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
186 KB
Volume
49
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

In this paper, a compact pseudo‐interdigital ultra‐wideband filter using several open stubs to improve the stopband is designed and implemented on FR4 substrate. This filter at center frequency f~0~ of 4 GHz has presented almost very good measured characteristics, including the bandwidth of 3–5.1 GHz (3‐dB fractional bandwidth of 52%), low insertion loss of −0.6 ± 0.4 dB, sharp rejection due to two transmission zeros in the passband edge created by inter‐stage coupling, and wide stopband rejection greater than 15 dB from 5.3–9 GHz. Experimental results of the fabricated filter show a good agreement with the predict results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 573–575, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22212

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