One of Surrey Satellite Technologies Limited (SSTL) key missions in build is the Lunar Pathfinder, and all of the elements are coming together in anticipation of a launch toward the end of 2025. Check out the Lunar Pathfinder SANT (photo above), which is an S-band antenna and Antenna Pointing Mechanism (APM).
The antenna is a 0.86 meter Parabolic CFRP Reflector fed by a Backfire Helix, capable of transmitting and receiving in S-band (2.0 – 2.3 GHz) with gain >20dB.
The APM is a novel design which rotates two swashplates to achieve a pointing range up to 25 degrees off-center. The flight mass of the APM 9.3 kg, or 11.3 kg with the antenna installed.
The Lunar Pathfinder SANT has been developed in-house at SSTL to communicate with assets on the surface of the moon and in lunar orbit as part of the primary payload of the Lunar Pathfinder spacecraft.