ANTENNA ADJUSTMENT CIRCUIT, ANTENNA ADJUSTMENT METHOD, AND COMMUNICATION UNIT
First Claim
Patent Images
1. An antenna adjustment circuit, comprising:
- a drive section inputting an alternating drive signal to a variable capacitance connected to an antenna; and
a control section setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance.
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Abstract
An antenna adjustment circuit includes: a drive section that inputs an alternating drive signal to a variable capacitance connected to an antenna; and a control section that sets a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance.
11 Citations
20 Claims
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1. An antenna adjustment circuit, comprising:
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a drive section inputting an alternating drive signal to a variable capacitance connected to an antenna; and a control section setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An antenna adjustment method, comprising:
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inputting an alternating drive signal to a variable capacitance connected to an antenna; and setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance.
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19. A communication unit with an antenna, a communication section performing communication using the antenna, and an antenna adjustment circuit, the antenna adjustment circuit comprising:
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a drive section inputting an alternating drive signal to a variable capacitance connected to the antenna; and a control section setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance. - View Dependent Claims (20)
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Specification