专利汇可以提供Aerial device专利检索,专利查询,专利分析的服务。并且PURPOSE: To prevent the disturbance of communication due to the influence of a rotor blade of a helicopter by switching plural antennas attached to the upper part of the helicopter body synchronously with the rotation of the rotor blade.
CONSTITUTION: The antennas 1A and 1B attached to the upper part of the body of a helicopter 11 are connected to an antenna switch 2 which is controlled by the synchronizing signal received from a rotation synchronizing signal detector 4 of a rotor blade 12 of the helicopter. The radio waves switched by the switch 2 are supplied to a radio transmitter/receiver 3. Then the signals of both antennas 1A and 1B are switched synchronously with the rotational cycle of the blade 12. At the same time, both antenna 1A and 1B are attached at the positions where a phase shift is produced so that the antennas 1A and 1B are not shielded by the blade 12 at one time. Thus a fixed synthetic output wave is secured between both outputs of antennas 1A and 1B. As a result, the communication is never interrupted.
COPYRIGHT: (C)1990,JPO&Japio,下面是Aerial device专利的具体信息内容。
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