|Title:||Compact Microstrip Bandpass Filters With Good Selectivity and Stopband Rejection||Authors:||Deng, Pu-Hua
|Keywords:||Bandpass filter;cross-coupling;microstrip;quarter-wavelength resonators||Issue Date:||Feb-2006||Publisher:||Taipei:National Taiwan University Dept Elect Engn||Journal Volume:||VOL. 54||Journal Issue:||NO. 2||Start page/Pages:||-||Source:||IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES||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.
|Appears in Collections:||電機工程學系|
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