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An Extended Configuration of a Stepped Impedance Comb-Line Filter
Toshio ISHIZAKI Tomoki UWANO Hideyuki MIYAKE
IEICE TRANSACTIONS on Electronics
Publication Date: 1996/05/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave Devices for Mobile Communications)
Category: Passive Devices
comb-line filter, stepped impedance resonator, laminated filter, attenuation pole, portable telephone,
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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.