Patent ID: 8736396

Claim:
A radio communicating device comprising: a first communicating block; a second communicating block rotatable about an axis of rotation relative to said first communicating block; and a radio signal transmission line capable of information transmission by radio waves between said first communicating block and said second communicating block, wherein, a signal to be transmitted between said first communicating block and said second communicating block is converted into a radio signal as a circularly polarized wave, and the radio signal as the circularly polarized wave is transmitted via said radio signal transmission line, said radio signal transmission line is configured as a waveguide, said waveguide being disposed between said first communicating block and said second communicating block for connecting said first communicating block and said second communicating block an inside of said waveguide is filled with a dielectric material, and said waveguide is formed by performing a surface treatment that applies a coating of thin film of a metallic material so as to cover a periphery of said dielectric material.