Improvement of Stop-Band Characteristics for Half-Wavelength Resonator Filters

Michiaki MATSUO  Hiroyuki YABUKI  Mitsuo MAKIMOTO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.7   pp.1472-1477
Publication Date: 2002/07/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
stripline filters,  coupled transmission lines,  attenuation,  poles and zeros,  

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Summary: 
In general, the attenuation characteristics of band-pass filters can be improved by generating attenuation poles in the stop band. In this paper, a design method for a planar band-pass filter with attenuation poles based on a half-wavelength resonator is proposed. According to this design, the attenuation poles can be obtained at any desired frequency by means of coupling structures. Two kinds of filter with the characteristics of steep skirt and wide stop-band were designed and fabricated with the result that the validity of the design method was demonstrated. Therefore, a filter with excellent attenuation characteristics for various applications can be achieved.