ARRAY TRANSMITTER RECEIVER CONTROLLED BY A TRUE TIME-DELAY FIBEROPTICBEAMFORMER/

We demonstrate a phased-array antenna controlled by a fiber-optic beam former in true tine-delayed transmit mode and in phase-delayed receive mode. The wavelength-tunable optical carrier propagating in a high-di spersion fiber realizes a true time-delay, with the steering direction set by a single voltage controlling the wavelength. The linear antenn a is a sparsely-populated array with eight broadband spiral elements. The transmitter operates in 2-18 GHz frequency range over +/- 50 degre es azimuth steering, and the receiver operates in 6-16 GHz frequency r ange over +/- 35 degrees azimuth steering.