| 摘要 |
PROBLEM TO BE SOLVED: To surely obtain an effect of switching by switching and selecting an antenna element used for transmission/reception of a radio signal from among a plurality of antenna elements and to successfully transmit/receive the radio signal even under an environment such as in a factory, where an influence of interference by a reflection signal is large by enhancing directivity of the antenna element. SOLUTION: Two antenna elements a1 and b1, a2 and b2 corresponding to the same type of polarized waves are arranged and supported so as to be separated from each other in the horizontal direction and the perpendicular direction. A signal transmission path of a received signal is formed so that a synthetic signal of a received signal by the antenna element a1 and a received signal by the antenna element b1 may be input to a predetermined signal processing part. COPYRIGHT: (C)2007,JPO&INPIT
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