A waveguide rotary joint includes a first waveguide member comprising a first waveguide portion, and a second waveguide member comprising a second waveguide portion, the second waveguide member rotatably connected via a curved circumferential path to the first waveguide member, wherein the second waveguide portion is adjacent to the first waveguide portion to define a first split rectangular waveguide. A first waveguide input/output port is communicatively coupled to the first waveguide portion, and a second waveguide input/output port is communicatively coupled to the second waveguide portion. Relative rotation between the first waveguide member and the second waveguide member changes an angular length of the first waveguide connecting the first waveguide input/output port to the second waveguide input/output port.

A waveguide rotary joint includes a first waveguide member comprising a first waveguide portion, and a second waveguide member comprising a second waveguide portion, the second waveguide member rotatably connected via a curved circumferential path to the first waveguide member, wherein the second waveguide portion is adjacent to the first waveguide portion to define a first split rectangular waveguide. A first waveguide input/output port is communicatively coupled to the first waveguide portion, and a second waveguide input/output port is communicatively coupled to the second waveguide portion. Relative rotation between the first waveguide member and the second waveguide member changes an angular length of the first waveguide connecting the first waveguide input/output port to the second waveguide input/output port.

An RF joint rotating about an axis of rotation (Z) includes a number N, greater than or equal to 1, of RF transmission channels, a first, internal surface of symmetry of revolution about the axis (Z) and of RF transmission having a first, internal radius r1, and a second, external surface of symmetry of revolution about the axis (Z) and of RF transmission having a second, external radius r2, strictly less than the first, internal radius r1. The first and second RF transmission surfaces facing one another and rotationally mobile about the axis (Z) are configured through the first and second radii r1, r2, the geometry of the first and second RF access ports, and the geometry of the first and second RF containment and guidance means, such that: each RF transmission channel Vi, i varying from 1 to N, comprises a first RF rotating waveguide, and the N first RF rotating waveguides are distributed angularly over a predetermined number NC, greater than or equal to 1 and less than or equal to N, of sections of surfaces of revolution about the axis (Z) of the second RF transmission surface, each of the NC sections being situated along the longitudinal axis of symmetry (Z) at a predetermined different level L1(k).

A polarizer apparatus for RF communications including an in-line waveguide switch having a first port with a rectangular waveguide shape, and a second port having a circular waveguide shape. The waveguide switch includes a plurality of rotatable disks coupled and arranged between the input and output of said waveguide switch, each of the disks having an opening provided therein which defines at least a portion of a signal path configured to allow RF signals to propagate therethrough. The waveguide switch includes an actuating mechanism arranged to rotate the disks to positions relative to each other which modify the polarization of RF signals propagating through the openings. The polarizer apparatus includes a feed coupled to the output of the waveguide switch, the feed including a vane polarizer arranged to circularly polarize signals provided thereto from the output of the waveguide switch.

A rotary joint including a stator intended to be fastened on a first part of the antenna and defining a transmission surface, and a rotor intended to be fastened on a second part of the antenna and defining a transmission surface, wherein one of the transmission surfaces includes primary means for delimiting electromagnetic signals and the other includes complementary means for delimiting electromagnetic signals; the rotor being mounted rotating relative to the stator such that at least part of the transmission surface of the rotor is positioned across from at least part of the transmission surface of the stator, the facing parts forming at least one transmission path between them for the electromagnetic signals delimited by the primary and complementary delimiting means.

A vehicle having a communication system is disclosed. The system includes two electrical couplings, coupled by way of a rotary joint having a bearing waveguide. Each electrical coupling includes an interface waveguide configured to couple to external signals. Each electrical coupling also includes a waveguide section configured to propagate electromagnetic signals between the interface waveguide and the bearing waveguide of the rotary joint. Additionally, the rotary joint is configured to allow one electrical coupling to rotate with respect to the other electrical coupling. An axis of rotation of the rotary joint is defined by a center of a portion of the waveguides. Yet further, the rotary joint allows electromagnetic energy to propagate between the waveguides of the electrical couplings.

A polarizer apparatus for RF communications including an in-line waveguide switch having a first port with a rectangular waveguide shape, and a second port having a circular waveguide shape. The waveguide switch includes a plurality of rotatable disks coupled and arranged between the input and output of said waveguide switch, each of the disks having an opening provided therein which defines at least a portion of a signal path configured to allow RF signals to propagate therethrough. The waveguide switch includes an actuating mechanism arranged to rotate the disks to positions relative to each other which modify the polarization of RF signals propagating through the openings. The polarizer apparatus includes a feed coupled to the output of the waveguide switch, the feed including a vane polarizer arranged to circularly polarize signals provided thereto from the output of the waveguide switch.

A rotary joint including a stator intended to be fastened on a first part of the antenna and defining a transmission surface, and a rotor intended to be fastened on a second part of the antenna and defining a transmission surface, wherein one of the transmission surfaces includes primary means for delimiting electromagnetic signals and the other includes complementary means for delimiting electromagnetic signals; the rotor being mounted rotating relative to the stator such that at least part of the transmission surface of the rotor is positioned across from at least part of the transmission surface of the stator, the facing parts forming at least one transmission path between them for the electromagnetic signals delimited by the primary and complementary delimiting means.

Electrical instrument for applying radiofrequency and/or microwave frequency energy to tissue, comprising: a distal part comprising an instrument tip for applying radiofrequency and/or microwave frequency energy to tissue, the instrument tip comprising first and second conductive elements: a coaxial feed cable comprising an inner conductor, a tubular outer conductor coaxial with the inner conductor, and dielectric material separating the inner and outer conductors, the coaxial feed cable being for conveying radiofrequency and/or microwave frequency energy to the distal part; wherein: the inner conductor is electrically connected to the first conductive element and the outer conductor is electrically connected to the second conductive element through a rotatable connection between the distal part and the coaxial feed cable that allows rotation of the distal part relative to the coaxial feed cable: and the instrument comprises an actuator for rotating the distal part in a first rotational direction relative to the feed cable.

A guided wave radar fluid level measurement system can measure the level of product in a tank. A pulse of RF energy sent along a waveguide in the tank can be reflected where the waveguide enters the product. A time of flight measurement can indicate the product level. The product inside the tank can flow and that flow can push the waveguide and thereby torque and possibly bend the waveguide. A streamlined wave guide is torqued less when the streamlining is aligned with the direction of flow. A rotating connector can provide for the waveguide to rotate and a weathervane effect can align the streamlined waveguide with the flow.