| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission/reception circuit and a transmission/reception circuit system that an output is increased by utilizing a reception coil as the resonance coil of a transmission coil at the time of transmission and a reception sensitivity is improved by decreasing a signal to turn to the reception coil by canceling transmission coil matching at the time of reception. SOLUTION: This system performs the transmission of power and signals and the reception of signals with electromagnetic waves and is provided with a transmission coil 3, a reception coil 4 having an electromagnetic coupling relation with this transmission coil, a resonance capacitor 32 for transmission connected to the reception coil, a reception coil matching circuit 7 connected to the reception coil and switching means 30 and 31 for connecting the resonance capacitor for transmission between both the terminals of the reception coil at the time of transmission, disconnecting the reception coil from the reception coil matching circuit, disconnecting the resonance capacitor for transmission from the reception coil at the time of reception and connecting the reception coil to the reception coil matching circuit, and the resonance capacitor for transmission has capacitance so that the resonance frequency of the transmission coil can be a frequency for transmission when the reception coil is to be functioned as a resonance coil. |
