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Compact wideband bandpass filters using rhombus-shaped triple-mode resonator

✍ Scribed by Sai Wai Wong; Lei Zhu

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
196 KB
Volume
51
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

A novel compact wideband bandpass filter is proposed using a stub‐loaded triple‐mode resonator (TMR) with rhombus configuration. This TMR is formed by shunt‐loading a stepped‐impedance stub at the center of a half‐wavelength resonator. As this TMR is driven in its two sides by two identical quarter‐wavelength parallel coupled lines, a wideband passband with a fractional bandwidth 80% is achieved. With the help of a two‐section stub, two transmission zeros are excited near the lower and higher cut‐off frequencies so as to sharpen the roll‐off skirt of the passband. A two‐stage filter is finally designed to enhance the rejection skirts. Measured results for the two fabricated filters confirm the predicted results with sharp rejection skirt and wideband performances. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2107–2109, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24536

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