An Extended Configuration of a Stepped Impedance Comb-Line Filter

Toshio ISHIZAKI  Tomoki UWANO  Hideyuki MIYAKE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E79-C   No.5   pp.671-678
Publication Date: 1996/05/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave Devices for Mobile Communications)
Category: Passive Devices
Keyword: 
comb-line filter,  stepped impedance resonator,  laminated filter,  attenuation pole,  portable telephone,  

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Summary: 
An extended configuration of a stepped impedance comb-line filter is presented. The parallel stripline sections of stepped impedance resonators are coupled electromagnetically and a coupling capacitor is introduced. The creation of an attenuation pole near the passband was detailed. A design procedure for the two-pole extended filter is derived from an analysis using even-and odd-mode impedances. Experimental filters were constructed by ceramic lamination technique. They exhibited excellent performances suitable for portable telephones.