An antenna array assembly is described herein. The assembly includes a housing, a plurality of antennas arranged in an array, an antenna switcher in communication with the array and a tuner. The tuner is in communication with the antenna switcher. The tuner has a memory and a channel look-up table contained therein. The look-up table has a remembered association between an optimal signal associated with each channel of the tuner and one of the plurality of antennas. The tuner is configured to automatically select from the look-up table only one of the plurality of antennas that has detected the optimal signal associated with the channel. When that channel is selected by a user the tuner instructs the antenna switcher to switch to the single antenna that is detecting the optimal signal in accordance with the look-up table.

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.

Embodiments of the present disclosure provide a rotary assembly. The rotary assembly comprises a stator disk, a rotor disk rotationally cooperated with the stator disk, at least one transmitting antenna disposed on a mating surface of one of the stator disk or the rotor disk, and at least one receiving antenna disposed on the mating surface of the other of the stator disk or the rotor disk. The transmitting antenna and the receiving antenna are electromagnetically coupled to maintain signal integrity during relative rotation.

A coupler provides a high speed datalink between rotatable parts, which includes comprising a circular gap shaped as a hollow-cylindric volume and at least two antennae. The gap is formed between a first ring and a second ring rotatable against the first ring. A first antenna is mechanically coupled to the first ring and a second antenna is mechanically coupled to the second ring. The antennae are configured to effectuate a microwave signal connection between them the antennae based on multiple reflections of the signal at the rings.

Systems configured to implement semi-closed wireless data transfer for rotary joints are disclosed. An example system includes first and second RF transceivers, to be included in different components of a rotary joint. The first and second RF transceivers implement elliptically (e.g., circularly) polarized antennas to realize a short distance communication link (e.g., a 60 GHz short distance communication link) between the two components of a rotary joint. The example system further includes an open-ended waveguide (OEWG) between the first and second RF transceivers, for receiving, at a first end of the OEWG, wireless signals transmitted by one of the first and second RF transceivers, transmitting the received signals through the OEWG, and radiating, at a second end of the OEWG, wireless signals indicative of the received wireless signals, to be received by another one of the first and second RF transceivers.