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Dual-Channel rotary joint for use on aerial vehicles

Link Microtek : 21 January, 2013  (New Product)
Rotary joint designed for use on board UAV and aircraft to enable ka-band satellite communications applications

The Engineering Division of Link Microtek has introduced a new dual-channel rotary joint that is specifically aimed at applications in Ka-band satellite communications systems on board aircraft or unmanned aerial vehicles.

Designed and manufactured at Link Microtek's premises in the centre of Basingstoke, the AM28RJUD device features a WR28 waveguide channel for transmissions in the 26.5 to 40GHz frequency band at up to 100W CW, combined with a DC-2GHz coaxial channel for receive signals.

The rotary joint complies with the relevant requirements of the RTCA DO-160 [AD/1] specification, which details environmental conditions and test procedures for airborne equipment - covering parameters such as temperature, pressure, humidity, shock and vibration.

To operate at the high frequencies of the Ka band, the device necessarily has small physical dimensions: it measures just 42mm between waveguide flanges and has an overall length of 120mm between coaxial connectors.

The non-contacting design of the waveguide channel makes for an inherently high power handling capability of 100W CW, together with a VSWR of 1.2:1 and a typical insertion loss of 0.6dB. The coaxial channel has a VSWR of 1.5:1 and an insertion loss of less than 0.4dB, while isolation between the two channels is better than 65dB.

Available fabricated in either aluminium or brass as standard, the AM28RJUD can be specified with a variety of different coaxial connectors, including SMA, N-type and TNC. As an option, the device can also be supplied with an integral slip-ring assembly.

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