The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1999
Filed:
May. 22, 1997
Seigo Hino, Nagoya, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
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.