| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication device and a radio communication system which can desirably control directivity of radio waves and surely operating an aimed apparatus without being influenced by an installation condition of a radio transmitter, a radio receiver or the like, or a radio-wave environment.SOLUTION: The radio communication system 100 includes a radio transmitter 1 and a radio receiver 2. The radio transmitter 1 includes a radio module 50 and a power source part 40, and the power source part 40 includes a secondary battery 42, a solar cell 41 and a charging circuit 43. The radio receiver 2 includes a radio module 70 and a CPU 80. The radio module 70 includes an antenna element 71, a high-frequency circuit 72, a signal processing circuit 73 and an infrared sensor 74. The radio receiver 2 and the infrared sensor 74 have significant directivity toward the front side of the infrared sensor 74, but do not have significant directivity toward the rear side of the infrared sensor 74 in contrast. |
