Title:
VARIABLE CAPACITANCE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2007/145259
Kind Code:
A1
Abstract:
It is possible to provide a variable capacitance circuit of a small size capable
of reducing distortion and current consumption and satisfying the power resistance
at a low cost. The variable capacitance circuit includes: a first variable capacitance
element unit formed by connecting n (n is a natural number not smaller than 2) variable
capacitance capacitors including at least one variable capacitance element
having a dielectric layer whose dielectric constant changes in accordance with
an applied DC voltage and a pair of electrodes sandwiching the dielectric layer,
the n first variable capacitance element units being connected in series when
viewed from high frequency and in parallel when viewed from DC current; and a second
variable capacitance element unit to which voltage amplitude smaller than voltage
amplitude of a high-frequency signal applied to the first variable capacitance
element unit is applied and which includes one variable capacitance element
or m (m is a natural number smaller than n) variable capacitance capacitors which
are connected in series.
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Inventors:
KATTA, Hiroshi (R & D Center Keihanna, 3-5-3 Hikaridai, Seika-cho, Soraku-gu, Kyoto 37, 6190237, JP)
Application Number:
JP2007/061933
Publication Date:
December 21, 2007
Filing Date:
June 13, 2007
Export Citation:
Assignee:
KYOCERA CORPORATION (6 Takeda Tobadono-cho, Fushimi-ku Kyoto-sh, Kyoto 01, 6128501, JP)
京セラ株式会社 (〒01 京都府京都市伏見区竹田鳥羽殿町６番地 Kyoto, 6128501, JP)
京セラ株式会社 (〒01 京都府京都市伏見区竹田鳥羽殿町６番地 Kyoto, 6128501, JP)
International Classes:
H03H7/00; H01G7/06; H03H5/12; H03H7/20; H03H7/38
Attorney, Agent or Firm:
SAIKYO, Keiichiro et al. (Shikishima Building, 2-6 Bingomachi 3-chome,Chuo-ku, Osaka-shi, Osaka 51, 5410051, JP)
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