| 摘要 |
PROBLEM TO BE SOLVED: To remotely wirelessly adjust variable capacitors which are provided in a loop antenna for the adjustment to an object operating frequency for transmission reception of the antenna and provided to a feeding part of the antenna for impedance matching adjustment of a feeding section. SOLUTION: A control section that is directly coupled with a variable capacitor provided to a loop antenna 10 to vary the capacitance, and reception control sections (a reception control section 17 for frequency and a reception control section 8 for feeding) are provided to the former control section to receive an optical signal for controlling the control section and to decode it. The reception control section allows a command signal generating section 13 to generate a control signal to command the change of the capacitance of the variable capacitor. This signal is changed into an optical signal and transmitted, and the optical signal is received by the reception control section and converted into a control signal to vary the capacitance of the variable capacitor thereby adjusting remotely feeding and the frequency of the loop antenna 10. |
