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:
Feb. 14, 1984
Filed:
Feb. 16, 1982
Raymond L Sokola, Lake Zurich, IL (US);
Charles Choi, Schaumburg, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A unique ceramic bandpass filter is disclosed that is comprised of a dielectric block having one or more holes extending from its top surface to its bottom surface and further having input and output electrodes each disposed on the dielectric block at a predetermined distance from a corresponding hole. The dielectric material is preferably a ceramic comprised of BaO, TiO.sub.2 and ZrO.sub.2. If there is only one hole in the dielectric block, the input and output electrodes may be arranged around that hole. If there are two or more holes in the dielectric block, one electrode may be located near the hole at one end and the other electrode may be located near the hole at the opposite end of the dielectric block. The dielectric block is entirely plated with copper or silver with the exception of portions near each hole and the input and output electrodes. Each plated hole is essentially a coaxial resonator. Coupling between adjacent coaxial resonators provided by the plated holes can be adjusted by slots or additional holes located therebetween. Two or more of unique ceramic bandpass filters can be intercoupled to provide a filter with greater selectivity or a multi-band filter for combining and/or frequency sorting two or more signals into/from a composite signal.