Waveguide rotary joint

H - Electricity – 01 – P

Patent

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Details

H01P 1/06 (2006.01)

Patent

CA 2110676

The rotor of the joint includes two rectangular waveguide ports, carrying two separate signals. The stator has two corresponding rectangular waveguide ports. The ports are coupled with a circular waveguide, which comprises two relatively rotatable stub-cylinders, disposed co-axially in-line on the axis of rotation. Signal A is transmitted through the circular waveguide, across the joint, in the TM01 propagation mode, while signal B is transmitted across the joint in the TE01 mode. These circular-symmetrical modes, with mutually orthogonal field distribution, are able to cut cross-talk interference, since the mode transducers of these modes maintain good mutual isolation, even though the signals are present together in the circular waveguide, and at the same or similar frequency. The TM01 mode (signal A) is excited, and received, by means of slots formed in the end wall of the circular waveguide stubs. The port for signal A communicates with the circular waveguide through the two slots. The TE01 mode (signal B) is excited, and received, by means of four axial slots formed in the cylindrical wall of the circular waveguide. The transducer for signal B is disposed in a wrap-around relationship with the circular waveguide, and is in communication with the circular waveguide through the four slots. An E-plane junctional continuation communicates the port for signal B, via two slots, with the transducer for signal B.

Le rotor du joint comprend deux ports de guide d'onde rectangulaire, acheminant deux signaux distincts. Le stator a deux ports de guide d'onde rectangulaire correspondants. Les ports sont couplés à un guide d'onde circulaire, qui comprend deux tronçons cylindriques tournant l'un par rapport à l'autre disposés coaxialement dans l'axe de rotation. Le signal A est transmis au joint par l'intermédiaire du guide d'onde circulaire en mode de propagation TM01, tandis que le signal B est transmis au joint en mode TE01. Ces modes circulaires-symétriques, avec répartition orthogonale des champs l'un par rapport à l'autre, peuvent couper la diaphonie, étant donné que les transducteurs de ces modes maintiennent une bonne isolation entre eux, même si les signaux sont présents simultanément dans le guide d'onde circulaire, et à la même fréquence ou à une fréquence similaire. Le mode TM01 (signal A) est excité, et reçu, au moyen de fentes formées dans la paroi terminale des tronçons de guide d'onde circulaire. Le port du signal A communique avec le guide d'onde circulaire par les deux fentes. Le mode TE01 (signal B) est excité, et reçu, au moyen de quatre fentes axiales formées dans la paroi cylindrique du guide d'onde circulaire. Le transducteur du signal B entoure le guide d'onde circulaire, et communique avec celui-ci par les quatre fentes. Un prolongement de jonction dans le plan E fait communiquer le port du signal B, par deux fentes, avec le transducteur du signal B.

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