| 摘要 |
PURPOSE: An RF device and a control method are provided to analyze a processing value of a signal processing unit to watch a frequency spectrum, intensity of an interferential signal, an interference channel and a propagation environment of a modulation system, thereby selecting the best channel. CONSTITUTION: A coupler unit(400) divides a signal from an antenna. A signal processing unit(200) analyzes a frequency spectrum and a reflecting coefficient of a received signal through the coupler unit. A reader unit(300) transmits and receives at least two channel signals. Based on the analyzed frequency spectrum and reflecting coefficient, a control unit(100) selects a channel with the best state. The control unit controls the reader unit to transmit and receive data through the selected channel.
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