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Stepped impedance hairpin design of a tunable bandpass filter with harmonic suppression

✍ Scribed by Yu-Wei Chen; Min-Hua Ho

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
159 KB
Volume
48
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

Stepped impedance hairpin resonators (SIHRs) with harmonic suppression and capability of frequency tuning are incorporated into a bandpass filter design. A tapped‐in U‐shaped feed structure is introduced to suppress harmonics and to reduce the passband insertion losses. The passband flexibility is accomplished by using a pair of tuning varactors. A simple method to implant a zero in the frequency response is also studied herein to further deepen the passband skirt. A 176% (4.32 GHz) stopband bandwidth is observed under more than 20‐dB band rejection. A measured minimum insertion loss of 1.19 dB is observed for the circuit with absence of the tuning varactors. Using the varactors, this filter has achieved a 22% frequency tuning range with all the insertion losses less than 5 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 697–701, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21447

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