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:
Apr. 04, 1989
Filed:
Mar. 19, 1987
Applicant:
Inventor:
Ikuo Katoh, Chiba, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H / ; H03H / ; H03H / ;
U.S. Cl.
CPC ...
333 / ; 333141 ; 333191 ; 333192 ;
Abstract
A phase equalizer with a pair of ceramic resonators with different resonant frequencies than each other provides convex group delay time characteristics, which compensates for the concave group delay time characteristics of a ceramic filter. Thus, the flat group delay time characteristics in the combination of a ceramic filter and a phase equalizer is obtained, and excellent speech quality in analog signal transmission and/or excellent error rate in data transmission is obtained, while keeping excellent selectivity in a wireless communication system.