Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1997-05-22
1999-01-26
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333134, H01P 1205, H01P 512
Patent
active
058642641
ABSTRACT:
A dielectric filter includes a dielectric ceramic block provided with three or more than three linearly arranged resonators. Coupling through bores are arranged between adjacent ones of the resonators and input/output pads are arranged vis-a-vis the respective outermost resonators for capacitive coupling. There are provided a pair of outer coupling electric paths extending from the respective input/output pads onto the open-circuit end surface which are arranged in juxtaposition with the respective outermost resonators with a coupling gap provided therebetween. A pair of inner coupling electric paths extends from the respective input/output pads onto the open-circuit end surface and are arranged between the outermost resonators in juxtaposition with the inner resonator or the respective inner resonators adjacent to the outermost resonators. A coupling gap is provided therebetween so as to remarkably reduce or eliminate the influence of the fly back x and consequently improve the attenuation performance of the dielectric filter.
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Patent Abstracts of Japan, Pub. No. 04095401, Mar. 27, 1992, Motoharu et al .
Ham Seungsook
NGK Spark Plug Co. Ltd.
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