Communications device, resonant circuit, and method of applying control voltage
First Claim
Patent Images
1. A communications device comprising:
- a resonant antenna including a variable capacitance element having a dielectric unit formed of a ferroelectric material, and performing non-contact communications with the outside; and
a control voltage generation unit generating a control voltage for controlling capacitance of the variable capacitance element, applying the generated control voltage to the dielectric unit of the variable capacitance element, and inverting an application direction of the control voltage applied to the dielectric unit at a predetermined rate, wherein at least one of a first control voltage applying operation just before a timing for inverting the application direction of the control voltage and a second control voltage applying operation just after the timing is the non-contact communications operation with the outside.
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Abstract
A communications device includes a resonant antenna including a variable capacitance element having a dielectric unit formed of a ferroelectric material, and performing non-contact communications with the outside; and a control voltage generation unit generating a control voltage for controlling capacitance of the variable capacitance element, applying the generated control voltage to the dielectric unit of the variable capacitance element, and inverting an application direction of the control voltage applied to the dielectric unit at a predetermined rate.
8 Citations
17 Claims
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1. A communications device comprising:
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a resonant antenna including a variable capacitance element having a dielectric unit formed of a ferroelectric material, and performing non-contact communications with the outside; and a control voltage generation unit generating a control voltage for controlling capacitance of the variable capacitance element, applying the generated control voltage to the dielectric unit of the variable capacitance element, and inverting an application direction of the control voltage applied to the dielectric unit at a predetermined rate, wherein at least one of a first control voltage applying operation just before a timing for inverting the application direction of the control voltage and a second control voltage applying operation just after the timing is the non-contact communications operation with the outside. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A resonant circuit comprising:
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a variable capacitance element having a dielectric unit formed of a ferroelectric material; and a control voltage generation unit generating a control voltage for controlling capacitance of the variable capacitance element, applying the generated control voltage to the dielectric unit of the variable capacitance element, and inverting an application direction of the control voltage applied to the dielectric unit at a predetermined rate, wherein at least one of a first control voltage applying operation before a timing for inverting the application direction of the control voltage and a second control voltage applying operation after the timing corresponds to the non-contact communications operation with the outside. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of applying a control voltage comprising:
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in a communications device including a variable capacitance element having a dielectric unit formed of a ferroelectric material, and a control voltage generation unit generating a control voltage for controlling capacitance of the variable capacitance element; applying, by the control voltage generation unit, a first control voltage to the dielectric unit in a predetermined direction; and applying, by the control voltage generation unit, a second control voltage through inverting an application direction of the control voltage at a predetermined rate after applying the first control voltage in the predetermined direction, wherein at least one of a first control voltage applying operation before a timing for inverting the application direction of the control voltage and a second control voltage applying operation after the timing corresponds to the non-contact communications operation with the outside.
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Specification