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Stopband-Extended Balanced Bandpass Filter Using Coupled Stepped-Impedance Resonators

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3 Author(s)
Chung-Hwa Wu ; Nat. Taiwan Univ., Taipei ; Chi-Hsueh Wang ; Chun Hsiung Chen

A novel fourth-order balanced bandpass filter is proposed based on the half-wavelength (lambda/2) stepped-impedance resonators (SIRs). By properly adjusting the parameters of each SIR, the proposed filter may be made compact and its stopband may also be extended simultaneously. Specifically, a balanced filter with acceptable common-mode rejection is implemented with its differential-mode and common-mode stopbands extended up to 5.5 fo d, where fo d is the center frequency of differential-mode passband.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:17 ,  Issue: 7 )

Date of Publication:

July 2007

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