An antenna system (10) includes circuitry (13) and an antenna unit (12). The antenna unit includes a multi-layer circuit board (21). The circuitry provides radio frequency signals, control signals and power to the circuit board. The circuit board has an array of antenna elements (23) on one side thereof,...http://www.google.se/patents/US6297775?utm_source=gb-gplus-sharePatent US6297775 - Compact phased array antenna system, and a method of operating same
