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:
Aug. 10, 1999
Filed:
Aug. 10, 1998
Katsuhiro Ikada, Kanazawa, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A surface acoustic wave device has a structure in which first and second filters are connected in parallel at a connection point connected to an input terminal or an output terminal. The surface acoustic wave device includes the first SAW filter having a capacitive impedance in a passband of the second SAW filter and having a higher passband than the second SAW filter and the second SAW filter having a capacitive impedance in the passband of the first SAW filter and having a lower passband than the first SAW filter. The second SAW filter is connected in parallel at the connection point on the input terminal or output terminal side of the first SAW filter. The impedance of the first SAW filter in the passband at the parallel-connected end has, before parallel connection, a resistance component of about 1.2 Z.sub.0 or higher with respect to the characteristic impedance Z.sub.0 of the device, and is higher than the impedance of the second SAW filter in the passband at the parallel-connected end thereof.