| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio device where a plurality of reception line signal frequencies are provided and sensitivity suppression based on harmonics in an operation clock signal is prevented. SOLUTION: A noise antenna 1 receives noise generated from a control unit 7 in a radio portable terminal 100 and application 12. A TRX antenna 2 is used for transmitting and receiving desired waves and also receives the noise generated inside the radio portable terminal 100. A radio section 3 comprises an antenna changing circuit 4 for changing a noise antenna 1 and the TRX antenna 2, a reception section 5, and a transmission section 6. The control unit 7 comprises a base band IC8 for controlling the radio section, a DSP 10, a memory 9, and a clock 11, cancels the noise by taking a difference between a signal receiving only the noise by the noise antenna and the desired waves where the noise received by the TRX antenna 2 is superposed; and can extract only the desired waves for obtaining stable reception sensitivity. COPYRIGHT: (C)2004,JPO&NCIPI
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