| 摘要 |
PROBLEM TO BE SOLVED: To keep stable communication performance, regardless of the arrangement places of a transmitter and a receiver, concerning a load controller using a radio communication apparatus which is constituted of the transmitter and the receiver for transmitting a control signal to turn on/off a load or to adjust a load level through the use of radio wave. SOLUTION: The load controller includes: a minute loop antenna 11 formed to be substantially vertical with respect to the mounting surface of a circuit board 2; a ground pattern 6 formed on the mounting surface of the circuit board 2 and functioning as a dipole antenna; and a radio circuit 12 mounted on the circuit board. When a conductive body is approaching, the rise of a resonance frequency in the minute loop antenna 11 caused by the conductive body is compensated by the reduction of the resonance frequency in the dipole antenna 6, thereby reducing inconsistency in impedance between the minute loop antenna 11 or the dipole antenna 6, and the radio circuit 12. COPYRIGHT: (C)2010,JPO&INPIT
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