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Northrop Grumman develops InP-based antenna

A phased array antenna with over 10,000 InP-based MMICs, which forms part of a military satellite communication system, has been developed by Northrop Grumman Space Technology.

Northrop Grumman s InP-based antenna for the Advanced Extremely High Frequency (EHF) payload, a military satellite communication system, is nearer completion after successful electrical testing.

The uplink phased array antenna, which receives signals from ground terminals, directs radio frequency beams electronically instead of using mechanical reflectors. This means that one array can replace many reflectors and provide faster military satellite communications and low noise levels. The higher data rate of the InP antenna system will allow transmission of information such as real-time video, battlefield maps and target data.

The array contains over 10,000 InP-based MMICs and operates at 44GHz. Using highly directional signals from the antenna, the chances of jamming or interception by the enemy are reduced, allowing secure, reliable communication between command and control units and the satellite.

Northrop Grumman says that thanks to its compact phased array, the Advanced EHF system will have ten times greater capacity and six times faster channel data rates than its predecessor, the Milstar II communications satellite.

"The tests demonstrate that we are on track to deliver the first flight payload in April 2006," said Clayton Kau, manager of the Advanced EHF payload program.

Northrop Grumman will provide two Advanced EHF payloads to Lockheed Martin, prime contractor for the Advanced EHF system.

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