| 摘要 |
PROBLEM TO BE SOLVED: To minimize the generation of interference radio waves to other radio communication systems or other radio communication channels, to secure sufficient reception radio wave strength even through an obstacle such as a wall, and to perform the short distance radio communication of a large capacity. SOLUTION: In a weak radio communication system for transmitting and receiving radio signals based on a weak radio standard between a transmitter and a receiver, a distance between the transmitter and the receiver is set to be less than a distance used for radio wave strength stipulation of the weak radio standard, and the transmitter is provided with a radio wave transmission means for emitting transmission radio waves in the direction of the receiver and emitting them so as to have a focus between the transmitter and the receiver. COPYRIGHT: (C)2006,JPO&NCIPI
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