Title:
FREQUENCY-VARIABLE ACOUSTIC FILM RESONATOR, FILTER AND COMMUNICATION APPARATUS USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2008/016075
Kind Code:
A1
Abstract:
An acoustic film resonator comprises a first piezoelectric film (101); a pair of
primary electrodes (103,104) that are formed on the first piezoelectric film and
to which an electric signal is applied; a second piezoelectric film (102) that
is disposed such that oscillation occurring in the first piezoelectric film
propagates to the second piezoelectric film; a pair of secondary electrodes (104,105)
that are formed on the second piezoelectric film and that outputs an electric
signal; a load (108) connected between the secondary electrodes; and a control
part (109) that controls the value of the load. Thus, an acoustic film resonating
element is configured wherein an electric signal from the primary electrodes
is outputted from the secondary electrodes through a piezoelectric effect and
wherein the resonance frequency and the antiresonance frequency can be varied
by controlling the value of the load. Both the resonance frequency and the antiresonance
frequency can be varied at the same time without degrading the resonance characteristic.
Inventors:
NAKATSUKA, Hiroshi (())
中塚宏 (())
YAMAKAWA, Takehiko (())
中塚宏 (())
YAMAKAWA, Takehiko (())
Application Number:
JP2007/065058
Publication Date:
February 07, 2008
Filing Date:
August 01, 2007
Export Citation:
Assignee:
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 5718501, JP)
松下電器産業株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 5718501, JP)
NAKATSUKA, Hiroshi (())
中塚宏 (())
松下電器産業株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 5718501, JP)
NAKATSUKA, Hiroshi (())
中塚宏 (())
International Classes:
H03H9/17; H01L41/09; H03H9/02; H03H9/54
Attorney, Agent or Firm:
IKEUCHI SATO & PARTNER PATENT ATTORNEYS (26th Floor, OAP TOWER 8-30, Tenmabashi 1-chome, Kita-ku, Osaka-sh, Osaka 26, 5306026, JP)
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