SHORT-DISTANCE WIRELESS COMMUNICATION DEVICE
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 resonan...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | 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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