Elastic wave control element using piezoelectric materials
AssigneesRion Co., Ltd., Kobayasi Institute of Physical Research
InventorsHidekazu Kodama, Fumitaka Funahashi, Munehiro Date, Eiichi Fukada, Tomonao Okubo, Kazunori Kimura
Life of this patent
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Abstract
An elastic wave control element includes a piezoelectric material which is inserted into a propagation path for an elastic wave or installed in an oscillator to allow the elastic wave in a selected frequency to be damped, reflected, or transmitted. The piezoelectric material is provided with a pair of electrodes between which a negative capacitance circuit is connected to allow a loss factor of the negative capacitance circuit in a selected frequency or frequency band to be matched with a dielectric loss factor of the piezoelectric material.
Claims20
An elastic wave control element comprising:
- a piezoelectric material which is inserted into a propagation path for an elastic wave or installed in an oscillator to allow the elastic wave in a selected frequency to be damped, reflected or transmitted;
- a pair of electrodes provided with the piezoelectric material;
- a negative capacitance circuit connected between the pair of electrodes;
- and wherein capacitance and loss factor of the negative capacitance circuit and frequency characteristics thereof are selectively variable to allow the loss factor of the negative capacitance circuit in a selected frequency or a selected frequency range to be matched with a dielectric loss factor of the piezoelectric material.
An elastic wave control element comprising:
- a piezoelectric material which is inserted into a propagation path for an elastic wave or installed in an oscillator to allow the elastic wave in a selected frequency band to be damped, reflected, or transmitted;
- a pair of electrodes provided with the piezoelectric material;
- a negative capacitance circuit connected between the pair of electrodes;
- and wherein capacitance and loss factor of the negative capacitance circuit and frequency characteristics and temperature characteristics thereof are selectively variable to allow frequency characteristics and temperature characteristics of an absolute value of capacitance and the loss factor of the negative capacitance circuit to be matched with frequency characteristics and temperature characteristics of capacitance and the loss factor of the piezoelectric material in a selected frequency band and temperature range.
An elastic wave control element comprising:
- a piezoelectric material which is inserted into a propagation path for an elastic wave or installed in an oscillator to allow the elastic wave in a selected frequency band to be damped, reflected, or transmitted;
- a pair of electrodes provided with the piezoelectric material;
- a negative capacitance circuit connected between the pair of electrodes;
- and wherein capacitance and loss factor of the negative capacitance circuit and frequency characteristics thereof are selectively variable to allow frequency characteristics of an absolute value of capacitance and the loss factor of the negative capacitance circuit to be matched with frequency characteristics of capacitance and loss factor of the piezoelectric material in a selected frequency band.
An elastic wave control element comprising:
- a piezoelectric material which is inserted into a propagation path for an elastic wave or installed in an oscillator to allow the elastic wave in a selected frequency or frequency band to be damped, reflected or transmitted;
- a pair of electrodes provided with the piezoelectric material;
- a negative capacitance circuit connected between the pair of electrodes;
- and wherein capacitance and loss factor of the negative capacitance circuit and temperature characteristics thereof are selectively variable to allow temperature characteristics of an absolute value of capacitance and the loss factor of the negative capacitance circuit to be matched with temperature characteristics of capacitance and a loss factor of the piezoelectric material in a selected temperature range.
Dependencies are inferred from the claim text.