Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
VARIABLE CAPACITANCE ELEMENT AND TUNABLE FILTER
Document Type and Number:
WIPO Patent Application WO/2012/114931
Kind Code:
A1
Abstract:
Provided is a variable capacitance element that uses a dielectric layer the dielectric constant of which changes with the application of voltage, and that enables a piezoelectric substrate such as a piezoelectric resonator or a tunable filter to be miniaturized. A variable capacitance element (1) comprises the following: a piezoelectric substrate (2); an oriented buffer layer (3) formed on top of the piezoelectric substrate (2); a dielectric layer (4) formed on top of the buffer layer (3), the dielectric constant of the dielectric layer changes with the application of voltage; and a first electrode and a second electrode provided so as to enable the application of electric field to the dielectric layer (4).

Inventors:
KADOTA MICHIO (JP)
KOUTSAROFF IVOYL P (JP)
KIMURA TETSUYA (JP)
TOCHISHITA HIKARI (JP)
Application Number:
PCT/JP2012/053343
Publication Date:
August 30, 2012
Filing Date:
February 14, 2012
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MURATA MANUFACTURING CO (JP)
KADOTA MICHIO (JP)
KOUTSAROFF IVOYL P (JP)
KIMURA TETSUYA (JP)
TOCHISHITA HIKARI (JP)
International Classes:
H01G7/06; H03H9/17; H03H9/64
Foreign References:
JP2008085081A2008-04-10
JP2010053399A2010-03-11
JPH11261028A1999-09-24
JP2004221128A2004-08-05
Other References:
None
See also references of EP 2680285A4
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
Patent business corporation Miyazaki and table-of-contents patent firm (JP)
Download PDF:
View/Download PDF      PDF Help
Claims:



 
Previous Patent: TUNABLE FILTER AND METHOD FOR MANUFACTURING SAME

Next Patent: METHOD OF EVALUATING DEGREE OF SKIN STRESS ACCUMULATION