| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a high frequency component of frequency bands unnecessary to field transmission, and to reduce effect on surrounding electronics. SOLUTION: The field transmission system comprises a variable capacity diode 1; inductors 2 and 3; resistors 4, 5, and 6; capacitors 7, 8, and 9; a buffer 10; a circuit ground 14; AC signal terminals 11 and 13 for inputting and outputting of a signal to a variable reactance; and a control signal input 12. The inductor 3 and the capacitor 9 are provided to eliminate unwanted high frequency component. Impedance of the inductor 3 is established to a level higher than the capacitor 9, in a frequency domain higher than the frequency bands used for transmission. COPYRIGHT: (C)2007,JPO&INPIT
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