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:
Jul. 24, 1984
Filed:
Feb. 16, 1982
Robert F D'Avello, Schaumburg, IL (US);
Raymond L Sokola, Lake Zurich, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A unique RF signal combining/sorting apparatus is disclosed that includes first and second filters each comprised of one or more bandstop/bandpass filters intercoupled by transmission lines. The bandstop/bandpass filters include a shunt inductor or capacitor and a dielectric block having an input electrode plated on its top surface and a hole located at predetermined distance from the input electrode. The dielectric material is preferably a ceramic comprised of BaO, TiO.sub.2 and ZrO.sub.2. The dielectric block is entirely plated with copper or silver except for a portion of the top surface surrounding the hole and electrode and is essentially a capacitively coupled, short-circuited coaxial transmission line. Each of the first and second filters is tuned to pass the frequencies of one signal and attenuate the frequencies of the signal passed by the other. The unique RF signal combining/sorting apparatus can be configured as a multi-signal combiner, multi-signal sorter, or multi-signal combiner/sorter. This feature of the unique RF signal combining/sorting apparatus renders it particularly well suited for use as an antenna duplexer for radio transmitters and receivers.