| 摘要 |
PURPOSE: To enhance transmission quality by directing a null direction of the directivity of an antenna nearly to a perpendicular direction of parallel walls so as to form a radio zone thereby eliminating a problem of multi-path fading. CONSTITUTION: In a space surrounded by two or more walls having at least a couple of two parallel waves 1a, 1b, a null direction of the directivity of an antenna of a base station is directed nearly to a perpendicular direction of the parallel walls 1a, 1b to form a radio zone 7. In this case, the directivity of the antenna of the base station is not directed to the wall 1a and the directivity of the antenna of a terminal station is not directed to the wall 1b inevitably, and a resulting reflection wave repeating plural number of times of reflection between the two parallel walls 1a,1b is not made incident from the directivity of the antennas of the base station 2 and the terminal stations 4a, 4b, then a delay time is large the reflection wave with high signal intensity is not received, the effect of multi-path fading is not caused and the transmission quality is enhanced.
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