US Patent Application No: 2005/0200,234

Number of patents in Portfolio can not be more than 2000

Surface acoustic wave element, surface acoustic wave device, duplexer, and method of making surface acoustic wave element

ALSO PUBLISHED AS: 7504759

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Abstract

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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.times.10.sup.10 .OMEGA..multidot.cm and not more than 1.5.times.10.sup.14 .OMEGA..multidot.cm. This surface acoustic wave element comprises the piezoelectric substrate having a low volume resistivity, whereas the volume resistivity is reduced to 1.5.times.10.sup.14 .OMEGA..multidot.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.times.10.sup.10 .OMEGA..multidot.cm, the IDT electrodes are significantly prevented from short-circuiting with each other.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TDK CORPORATIONTOKYO, JP3908

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Osanai, Katsunori Tokyo, JP 2 0
Sobu, Masaki Tokyo, JP 10 1

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SEIKO EPSON CORPORATION (1)
* 5,426,340 Surface acoustic wave device and method of manufacturing the same 25 1994
 
NIHON DEMPA KOGYO CO., LTD. (1)
* 5,889,446 Surface acoustic wave device with a resistor thin film to remove pyroelectric effect charges 10 1997
 
KINSEKI LIMITED (1)
* 5,923,231 Surface acoustic wave device with an electrode insulating film and method for fabricating the same 29 1996
 
MURATA MANUFACTURING CO., LTD. (1)
* 6,734,601 Surface acoustic wave device, method for making the same, and communication apparatus including the same 3 2002
 
TAIYO YUDEN CO., LTD. (1)
* 5,796,205 Surface acoustic wave device and method of producing the same 9 1996
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
MURATA MANUFACTURING CO., LTD. (1)
* 7,425,881 Surface acoustic wave device and method that prevents restoration of a pyroelectric effect 2 2005
* Cited By Examiner