MOBILE RADIO COMMUNICATION SYSTEM

摘要

PURPOSE:To keep high transmission quality by using an antenna of a ground stationary station as a circularly polarized wave downward beam antenna an adopting an upward beam antenna for an antenna of a mobile body to select a circularly polarized wave in any rotating direction. CONSTITUTION:An antenna 2 installed on ground radiates a circularly polarized wave rotated to the right or left and an antenna 2' installed on ground radiates a circularly polarized wave rotated in the inverted direction to that of the antenna 2. On the other hand, an on-vehicle antenna 4 of a vehicle 3 receives a circularly polarized wave rotated in any direction and receives only any circularly polarized wave selectively. Thus, the antenna 4 mounted ON the vehicle 3 does not receive a signal reflected in a building or a road and led horizontally or downward. Since the rotation direction of the circularly polarized wave of the adjacent antenna installed on ground is set oppositely to each other, the reception of the direct wave from other adjacent ground installed antenna is prevented.