Patent ID: 9602192
Date: 2017-03-21
CPC Classifications: H01P,H01Q,H02P,H04B

Claim:
1. A communication apparatus which uses radio waves between a stator and a rotator, comprising: a stator; a substantially cylindrical rotator which rotates around a rotation shaft attached to the stator, the communication apparatus performing two-way communication between at least one rotator-specific communication device placed on the rotator and one stator-specific communication device placed on the stator by using radio waves to transmit a downstream signal from the stator-specific communication device to the rotator-specific communication device and transmit an upstream signal from the rotator-specific communication device to the stator-specific communication device, wherein the stator-specific communication device is connected to a plurality of stator-specific antennas, the rotator-specific communication device is connected to at least one rotator-specific antenna, the stator-specific antennas and the rotator-specific antenna are respectively placed on the stator and the rotator in such a manner as that radiation surfaces thereof face each other, the rotator-specific communication device includes a signal strength indicator which detects a signal strength of the downstream signal, and the stator-specific communication device includes