Self-steering. self-focussing phased array for SHARP

Attention is given to SHARP (Stationary High Altitude Relay Platform), a proposed electrically powered light aircraft which will fly on station at 21000 m altitude for months on end. receiving its power from the ground. Its mission is to carry a transmitter and antenna for broadcasting, microwave relay, mobile communications or radar, at far less cost than a satellite. A large ground antenna transmits microwave power to the aircraft were the power is captured by an array of antenna-rectifiers and is used to propel the aircraft and to power the payload. It is assumed that a phased array will be used, and the phases of the elements adjusted to steer and focus the beam. The proposed system is self-focusing and self-steering: wherever the aircraft goes the beam points at it and is focused on it. The system has been simulated on a small scale with a 5 by 5 square array using Advanced Basic.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>