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. 09, 2021
Filed:
Dec. 13, 2018
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Yuichi Takamine, Nagaokakyo, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A quadplexer includes a first filter and a second filter whose passband has frequencies higher than the first filter. The first filter has a ladder filter structure including series resonators disposed on a first path and parallel resonators disposed on a path connecting the first path and ground. A series resonator that is closest to a common terminal among the series resonators includes an IDT electrode that excites elastic waves, and a reflector that reflects the elastic waves excited by the IDT electrode. A distance between the IDT electrode and the reflector is greater than or equal to about 0.44λ and less than about 0.5λ where λ is a wavelength of the elastic waves that is defined by an electrode cycle of the IDT electrode.