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:
Mar. 17, 2009
Filed:
Mar. 04, 2005
Masaki Sobu, Tokyo, JP;
Katsunori Osanai, Tokyo, JP;
Masaki Sobu, Tokyo, JP;
Katsunori Osanai, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A surface acoustic wave element, a surface acoustic wave device, a duplexer, and a method of making a surface acoustic wave element which significantly restrain characteristics from deteriorating are provided. The surface acoustic wave element in accordance with the present invention comprises a piezoelectric substrate, and an IDT electrode formed on the piezoelectric substrate, whereas the piezoelectric substrate has a volume resistivity of not less than 3.6×10Ω·cm and not more than 1.5×10Ω·cm. This surface acoustic wave element comprises the piezoelectric substrate having a low volume resistivity, whereas the volume resistivity is reduced to 1.5×10Ω·cm or less. Therefore, discharging is restrained from occurring between IDT electrodes, whereby characteristics are significantly kept from deteriorating. Also, since the volume resistivity of the piezoelectric substrate is not less than 3.6×10Ω·cm, the IDT electrodes are significantly prevented from short-circuiting with each other.