Patent ID: 8369781
Filing Date: 2013-02-05
Classification: G06K

Abstract:
1. A radio data communication apparatus, comprising: a circuit unit configured to perform a data read operation and a data write operation relative to an IC tag, determine a unique IC tag communication frequency uniquely corresponding to the IC tag, and selectively output a carrier wave having a specific carrier wave frequency corresponding to said unique IC tag communication frequency; and at least one antenna unit, each antenna unit being arranged at a position separated from the circuit unit, and including an antenna configured to transmit a first signal and receive a second signal, and a signal modulation circuit configured to modulate the carrier wave and a data signal with a predetermined signal modulation to generate the first signal to be transmitted by radio transmission through the antenna to the specific IC tag in the data write operation, and conduct a predetermined signal demodulation to the second signal received from the specific IC tag in the data read operation, wherein the carrier wave and the data signal are transmitted by the circuit unit to the antenna unit in synchronism with each other, such that the carrier wave and the data signal are separated and not in a superimposed state in a transmission path between the circuit unit and the antenna unit.