Patent ID: 7064726
Filing Date: 2006-06-20
Classification: H01P,H01Q

Abstract:
1. An antenna apparatus comprising: a fixed-side transmission line having an electric field distribution or a magnetic field distribution that is axially symmetrical in a propagating direction; a rotation-side transmission line, having an axially symmetrical electric field distribution or magnetic field distribution, arranged coaxially with the fixed-side transmission line so as to be rotatable about an axis of the fixed-side transmission line; a transmission-line side choke disposed between the fixed-side transmission line and the rotation-side transmission line and arranged to cause a short-circuit between the fixed-side transmission line and the rotation-side transmission line at a high frequency; and a primary radiator disposed in the rotation-side transmission line so as to be rotatable together with the rotation-side transmission line for radiating high-frequency signals that have passed through the rotation-side transmission line in a direction that is different from that of a rotation axis of the rotation-side transmission line.