SHORT-DISTANCE WIRELESS COMMUNICATION DEVICE
First Claim
1. A short-distance wireless communication device, comprising:
- an antenna coil;
a coupling degree detecting section which is configured to detect a coupling degree of the antenna coil corresponding to a frequency; and
a resonance frequency setting section which is configured to set a resonance frequency of the antenna coil, whereinshort-distance wireless communication device is configured to perform a communication using a carrier wave of a predetermined frequency with a different antenna coil which is opposed to the antenna coil,in a first period, the antenna coil transmits a carrier wave at a first level, and also the coupling degree detecting section detects a frequency for which the coupling degree is higher than a predetermined coupling degree, and sets the detected frequency as the resonance frequency in the resonance frequency setting section, andin a second period, the antenna coil transmits the carrier wave at a second level that is larger than the first level.
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Accused Products
Abstract
Provided is a contactless communication R/W device that has low power consumption and a wide communication area in contactless communication that performs delivery of electronic data with a contactless communication device. The contactless communication R/W device includes an antenna coil, a resonance frequency setting section which sets a resonance frequency, and a coupling degree detecting section which detects a coupling degree corresponding to the resonance frequency of a counterpart antenna coil. The contactless communication R/W device transmits, in a first period before the start of communication, a carrier wave at a first level, and detects the coupling degree while changing the resonance frequency, and then, in a second period, the antenna coil transmits a carrier wave at a second level that is larger than the first level.
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Citations
7 Claims
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1. A short-distance wireless communication device, comprising:
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an antenna coil; a coupling degree detecting section which is configured to detect a coupling degree of the antenna coil corresponding to a frequency; and a resonance frequency setting section which is configured to set a resonance frequency of the antenna coil, wherein short-distance wireless communication device is configured to perform a communication using a carrier wave of a predetermined frequency with a different antenna coil which is opposed to the antenna coil, in a first period, the antenna coil transmits a carrier wave at a first level, and also the coupling degree detecting section detects a frequency for which the coupling degree is higher than a predetermined coupling degree, and sets the detected frequency as the resonance frequency in the resonance frequency setting section, and in a second period, the antenna coil transmits the carrier wave at a second level that is larger than the first level. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification