Rotary joint for a rotary antenna and rotary antenna comprising such a joint

A rotary joint for a rotary antenna comprising a first part and a second part rotating relative to the first part, the rotary joint being intended to connect the first part and the second part of the antenna and to transmit electromagnetic signals between the parts, having a ring sector shape with a variable opening and defining a rotation axis passing through the ring center, a plurality of radial directions extending from the ring center toward its periphery and a plurality of circumferential directions extending along concentric circles arranged around said rotation axis, the rotary joint comprising:

• a stator intended to be fastened on the first part of the antenna and defining a surface for transmitting electromagnetic signals, perpendicular to said rotation axis;
• and
• a rotor intended to be fastened on the second part of the antenna and defining a surface for transmitting electromagnetic signals, perpendicular to said rotation axis,
• wherein one of said transmission surfaces includes primary means for delimiting electromagnetic signals and the other includes complementary means for delimiting electromagnetic signals,
• wherein said rotor is mounted rotating relative to said stator around said rotation axis such that in any position of said rotor, at least a part of said transmission surface of said rotor is positioned to face least a part of said transmission surface of said stator, and
• wherein in any position of said rotor, the facing parts of said transmission surfaces of said rotor and said stator form at least one transmission path between them for the electromagnetic signals, the transmission path being delimited by said primary and complementary delimiting means and extending in a circumferential direction.