Ka-band rotary joint includes Tx, Rx and power


Ka-band rotary joint includes Tx, Rx and power - Link-Microtek-LM644

“By combining the functions of the microwave rotary joint and slip ring into one device, the AM28RJDSR assembly helps SOTM system manufacturers minimise the height of their antenna radomes,” said the firm.

There is a central 27.5-31GHz channel, implemented in WR28 waveguide and K-type coax, for transmitting RF signals with a power at up to 40W, while a DC-2.15GHz SMA coaxial outer channel is provided for L-band receive signals.

On top of this the slip ring conveys electrical power from the system stationary pedestal to components on the rotating side, including motors, encoders and GPS receivers.

Microwave performance includes a VSWR of 1.3:1 and a typical insertion loss of just 0.5dB on the transmit channel, while the receive channel has a power rating of 1W, a VSWR of 1.5:1 and a typical insertion loss of 0.4dB.

Isolation between the channels is specified as -25dB.

Designed for lock-on and dither operation with 360° rotation in both directions, the device is fabricated from lightweight aluminium and is suitable for use in ambient temperatures ranging from -40 to 60°C.

Applications are expected on mobile ground vehicles, ships or aircraft to provide broadband network access for high-data-rate applications such as real-time high-definition video or transmission of telemetry data.


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