Balanced Coupled-Resonator Bandpass Filters Using Multisection Resonators for Common-Mode Suppression and Stopband Extension
Resource
IEEE Transactions on Microwave Theory and Techniques 55 (8): 1756-1763
Journal
IEEE Transactions on Microwave Theory and Techniques
Pages
1756-1763
Date Issued
2007
Date
2007
Author(s)
Wu, Chung-Hwa
Wang, Chi-Hsueh
Chen, Chun Hsiung
Abstract
Novel fourth-order balanced coupled-resonator bandpass filters are proposed using suitably designed half-wavelength (lambda/2) multisection resonators for common-mode suppression. By properly designing the input/output (I/O) resonators associated with the filter composed of four bi-section resonators, a balanced filter with good common-mode suppression is realized, but its rejection bandwidth is rather limited. To widen the rejection bandwidth, the I/O bi-section resonators are replaced by the tri-section ones so that a balanced filter with good common-mode suppression and wide rejection bandwidth may be realized by suitably arranging the composed bi-/tri-section resonators. Specifically, a stopband-extended balanced filter with good common-mode suppression (>50 dB) within the differential-mode passband is implemented and its stopbands are also extended up to 5f 0 d with a rejection level of 30 dB, where f 0 d is the center frequency in differential-mode operation.
Type
journal article
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