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UWB bandpass filters using short-circuited shunt stub-embedded multiple-mode resonators

✍ Scribed by Sai Wai Wong; Lei Zhu

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 274 KB
Volume: 51
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.24687

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✦ Synopsis

Abstract

An ultra‐wideband (UWB) bandpass filter with good out‐of‐band rejection is presented in this work. As a starting part of designing UWB filter, a shunt short‐circuited stub is introduced at the center of a half‐wavelength resonator and it can generate two transmission zeros near the lower and upper cutoff frequencies. With the use of even‐ and odd‐mode approach, this initial multiple‐mode resonator is characterized and designed to build up a bandpass filter with good UWB passband and highly attenuated out‐of‐band skirt. Next, a coupled‐line section with cross‐coupling property is formed in this short‐circuited stub so as to widen the concerned upper‐stopband due to excitation of two more transmission zeros. Finally, a UWB bandpass filter prototype is fabricated to experimentally validate the attractive in‐band and out‐of‐band performances as predicted in theory. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2556–2559, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24687

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