Title:
CAPACITATIVE ELEMENT
Document Type and Number:
WIPO Patent Application WO/2007/116471
Kind Code:
A1
Abstract:
This invention provides a capacitative element that comprises a dielectric
layer provided between a first electrode layer and a second electrode layer and
enables the capacitance to be changed by an externally applied voltage. The dielectric
layer is formed of a perovskite oxide represented by a chemical formula (A2+B4+O3)x-(A2+(C2+
1/3D5+
2/3)O3)y
which is a composite of a first perovskite oxide having a structure of A2+B4+O3and a second perovskite oxide having a structure of A2+(C2+
1/3D5+
2/3)O3
wherein composition ratio x + composition ratio y = 1, element A is a divalent metal
ion, element B is a tetravalent metal ion, element C is a divalent metal ion, and
element D is a pentavalent metal ion. This capacitative element causes a large
change in capacitance and is small in loss to high-frequency signals and thus
is useful as a variable capacitative element used in high-frequency circuits
such as portable telephones (cellular phones).
Inventors:
KURIHARA, Kazuaki (1-1 Kamikodanaka 4-chome, Nakahara-ku, Kawasaki-sh, Kanagawa 88, 2118588, JP)
栗原 和明 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 富士通株式会社内 Kanagawa, 2118588, JP)
SHIOGA, Takeshi (1-1 Kamikodanaka 4-chome, Nakahara-ku, Kawasaki-sh, Kanagawa 88, 2118588, JP)
塩賀 健司 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 富士通株式会社内 Kanagawa, 2118588, JP)
栗原 和明 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 富士通株式会社内 Kanagawa, 2118588, JP)
SHIOGA, Takeshi (1-1 Kamikodanaka 4-chome, Nakahara-ku, Kawasaki-sh, Kanagawa 88, 2118588, JP)
塩賀 健司 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 富士通株式会社内 Kanagawa, 2118588, JP)
Application Number:
JP2006/306853
Publication Date:
October 18, 2007
Filing Date:
March 31, 2006
Export Citation:
Assignee:
FUJITSU LIMITED (1-1 Kamikodanaka 4-chome, Nakahara-ku Kawasaki-sh, Kanagawa 88, 2118588, JP)
富士通株式会社 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 Kanagawa, 2118588, JP)
KURIHARA, Kazuaki (1-1 Kamikodanaka 4-chome, Nakahara-ku, Kawasaki-sh, Kanagawa 88, 2118588, JP)
栗原 和明 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 富士通株式会社内 Kanagawa, 2118588, JP)
SHIOGA, Takeshi (1-1 Kamikodanaka 4-chome, Nakahara-ku, Kawasaki-sh, Kanagawa 88, 2118588, JP)
富士通株式会社 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 Kanagawa, 2118588, JP)
KURIHARA, Kazuaki (1-1 Kamikodanaka 4-chome, Nakahara-ku, Kawasaki-sh, Kanagawa 88, 2118588, JP)
栗原 和明 (〒88 神奈川県川崎市中原区上小田中４丁目１番１号 富士通株式会社内 Kanagawa, 2118588, JP)
SHIOGA, Takeshi (1-1 Kamikodanaka 4-chome, Nakahara-ku, Kawasaki-sh, Kanagawa 88, 2118588, JP)
International Classes:
H01B3/12; C23C14/34; H01G4/12; H01G7/06; H01L21/822; H01L27/04
Attorney, Agent or Firm:
KITANO, Yoshihito (Exceed Yotsuya 2nd Floor 9, Daikyo-cho Shinjuku-k, Tokyo 15, 1600015, JP)