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. 23, 2024
Filed:
Nov. 12, 2020
Applicant:
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Inventor:
Koichiro Kawasaki, Nagaokakyo, JP;
Assignee:
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H 9/64 (2006.01); H03H 9/145 (2006.01); H03H 9/72 (2006.01); H03H 9/205 (2006.01);
U.S. Cl.
CPC ...
H03H 9/6489 (2013.01); H03H 9/14547 (2013.01); H03H 9/14552 (2013.01); H03H 9/14558 (2013.01); H03H 9/205 (2013.01); H03H 9/6483 (2013.01); H03H 9/725 (2013.01);
Abstract
In a filter device, a transversal elastic wave filter, which defines a delay element, is connected in parallel with a band pass filter. The transversal elastic wave filter has the same amplitude characteristic as and the opposite phase to the band pass filter at a desired frequency inside an attenuation range of the band pass filter. When a wavelength determined by an electrode finger period of IDTs and is denoted by λ, the distance between the first IDT and the second IDT of the elastic wave filter is about 12λ or less.