Parallel-Coupled Bandpass Filters Based on Lumped-Distributed Coupled-Line Sections
Date Issued
2005
Date
2005
Author(s)
Yang, Hsi-Ming
DOI
zh-TW
Abstract
In this study, parallel-coupled bandpass filters based on lumped-distributed coupled-line sections have been proposed to possess the merits of compact size, good selectivity, and good stopband rejection.
Novel parallel-coupled bandpass filters are proposed, by using additional lumped capacitors or inductors to reduce the length of coupled-line sections. In addition, by introducing the capacitive or inductive cross-coupling effect, transmission zeros can be achieved to improve the filter selectivity. The locations of transmission zeros may be simply adjusted by varying the cross-coupling capacitance or inductance. Simple equivalent-circuit models and design formulas are also established, from which the proposed parallel-coupled bandpass filters based on lumped-distributed coupled-line sections may be design and investigated.
Furthermore, the approach to suppress the spurious response is also discussed so as to enhance the stopband characteristics.
Subjects
帶通濾波器
耦合線
交互耦合
bandpass filters
coupled-line
cross-coupling
Type
thesis
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