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Title: The Quasi-Elliptic Bandpass Filter Using Quarter-Wavelength Stepped Impedance Resonators
Authors: Chen, Yu-Wei;Liu, Yen-Ju;Ho, Min-Hua
Contributors: 電子工程學系
Date: 2006-06
Issue Date: 2012-05-22T06:27:05Z
Publisher: PIERS
Abstract: A bandpass filter is designed using two end-connected quarter-wavelength stepped impedance resonators. The quarter-wavelength stepped impedance resonators are implemented by a half-wavelength stepped impedance resonator with its middle shorting to ground. Hence, the modes that the λ/4 stepped impedance resonator supports are the (1+2n)/4 which also occur on the branches of a combline. An enhanced U-shape coupling feed is adopted in the filter design to reduce the insertion losses as well as suppressing the harmonics. The proposed filter has a quasi-elliptic frequency response. An equivalent circuit model is developed and the experiments are conducted for circuit design verification.
Relation: PIERS ONLINE, 2(6): 605-608
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