Signal-Interference Stepped-Impedance-Line Microstrip Filters and Application to Duplexers

被引:38
作者
Gomez-Garcia, Roberto [1 ]
Munoz-Ferreras, Jose-Maria [1 ]
Sanchez-Renedo, Manuel [1 ]
机构
[1] Univ Alcala, Dept Signal Theory & Commun, Madrid 28871, Spain
关键词
Bandpass filter (BPF); dual-band filter; duplexer; microstrip; microwave filter; signal interference; stepped-impedance transmission line; transmission zero; ultra-wideband technology; SHARP-REJECTION; BAND; COMPACT; DESIGN;
D O I
10.1109/LMWC.2011.2160164
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this letter, signal-interference filtering sections shaped by two in-parallel stepped-impedance transmission lines are applied to frequency-asymmetrical microstrip filter design. When realizing single-passband filters, a different selectivity for the lower and upper stopband can be generated, making them appropriate for duplexing devices. In the case of double-passband filters, fully-asymmetrical dual bands in terms of bandwidth, cutoff slopes and class of filtering transfer function can be shaped. Examples of design curves to adjust the performances of the synthesized signal-interference section filtering profile are given, e. g., bandwidth or in-band ripple level for Chebyshev-type functions. To show practical viability, a duplexer and a spectrally-asymmetrical dual-passband filter circuit are also built and characterized.
引用
收藏
页码:421 / 423
页数:3
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