Compact Distributed-Lumped Microstrip Bandpass Filters
Date Issued
2005
Date
2005
Author(s)
Kuo, Tsung-Nan
DOI
zh-TW
Abstract
In this study, novel compact distributed-lumped microstrip bandpass filters, based on folded quarter-wavelength(λ/4) resonators, are proposed. Two transmission zeros at upper and lower stopbands are created by introducing a cross-coupling capacitance directly between the input and output ports of a 2nd-order filter. This pair of transmission zeros would not degrade the passband insertion loss and may improve the selectively.
In order to achieve good spurious response and small circuit area, suitable open stubs and stepped impedance resonators are adopted in the filter design. The improved results are verified through experiments. Moreover, a novel 4th-order filter is also implemented. By suitably introducing two capacitive cross-coupling paths in the 4th-order filter, improved selectivity and good stopband rejection can be achieved.
Subjects
微帶線帶通濾波器
Microstrip Bandpass Filters
Type
thesis
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