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. 27, 2007
Filed:
Nov. 24, 2004
Applicant:
Eiju Komuro, Chuo-ku, JP;
Inventor:
Eiju Komuro, Chuo-ku, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H 9/70 (2006.01); H03H 9/54 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electric filter according to an embodiment of the present invention is an electric filter having a piezoelectric resonatorto obtain a signal of a predetermined resonance frequency from a bulk wave propagating inside a piezoelectric filmThis electric filter is configured to satisfy k>(BP/0.6f), where kis the square of an effective electromechanical coupling coefficient of the piezoelectric resonatorBP a pass bandwidth of the electric filter, and f a center frequency of a target pass band of the electric filter.