Patent ID: 8860620

Claim:
An electromagnetic wave radiation coaxial cable, comprising: an inner conductor comprising a conductor and extending along a cable axis; an insulator covering the inner conductor; and an outer conductor spirally wound around the insulator in a single winding at a predetermined pitch to form a gap consisting essentially of a single spiral groove from which a part of the insulator is exposed, wherein a formula is established as: ɛ r - 1 < λ P < ɛ r + 1 wherein λ is a wavelength of a radio frequency signal to be transmitted or received, ∈r is a relative dielectric constant of the insulator at the wavelength λ, and P is a winding pitch of the outer conductor along a direction of the cable axis, and wherein the electromagnetic wave radiation coaxial cable is configured to radiate a circular polarized electromagnetic wave when the radio frequency signal is applied to the inner conductor.