Compact Microstrip Bandpass Filters With Good Selectivity and Stopband Rejection
Resource
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 54, NO. 2, FEBRUARY 200
Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Journal Volume
VOL. 54
Journal Issue
NO. 2
Pages
-
Date Issued
2006-02
Date
2006-02
Author(s)
Deng, Pu-Hua
Lin, Yo-Shen
Wang, Chi-Hsueh
Chen, Chun-Hsiung
DOI
246246/200611150121349
Abstract
Compact microstrip bandpass filters (second- and
fourth-order) are proposed based on the folded quarter-wavelength
( 4) resonators, which are mainly coupled through
the shunt inductors connected to the ground. By introducing a
cross-coupling capacitance directly between the input and output
ports of the second-order filter, a pair of transmission zeros may
be created to improve the selectivity. Moreover, by an extension
of the proposed second-order filter with the incorporation of an
additional cross-coupling capacitance, a fourth-order filter is
also proposed in which two pairs of transmission zeros may be
created to improve both the selectivity and stopband rejection.
The proposed fourth-order filter also has the merits of small
circuit area and no spurious response up to 3 0, where 0 is
the passband center frequency. To provide effective design tools,
simple equivalent-circuit models are also established.
Subjects
Bandpass filter
cross-coupling
microstrip
quarter-wavelength resonators
Publisher
Taipei:National Taiwan University Dept Elect Engn
Type
journal article
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