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The design of a compact quasi-elliptic filter using stepped impedance resonators with harmonic suppression

✍ Scribed by Yu-Wei Chen; Min-Hua Ho; Yen-Ju Liu

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 286 KB
Volume: 49
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.22298

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✦ Synopsis

Abstract

A bandpass filter is designed at 2.4 GHz using two end‐connected quarter‐wavelength stepped impedance resonators. The quarter‐wavelength stepped impedance resonators having one end shorted are formed by a half‐wavelength stepped impedance resonator with its middle shorting to ground. The modes that the shorted‐end λ/4 stepped impedance resonator supports are the (1 + 2__n__)/4. An enhanced U‐shape coupling feed is adopted in the filter design to reduce the insertion losses as well as to suppress the first higher harmonic. A dual‐path design is implemented in the proposed filter to create a quasi‐elliptic frequency response. The equivalent circuit model is developed and the experiments are conducted for circuit design verification. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 800–804, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22298

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