Wide Band Mosaic Lens Antenna Array.
Patent, Filed 1 Feb 80, patented 25 May 82,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A wide band, substantially constant beamwidth, frequency independent, scannable acoustic array uses a mosaic pattern acoustic lens arrangement of fully directive acoustic lens antennas as the primary array antenna elements. The lenses at the center of the array pass signals at all frequencies, the lenses near but not at the center pass all signals except those at the highest frequencies and the lenses on the outer periphery pass only those at the lowest frequencies. When used as a transmitter, a wide band source supplies a broad frequency signal to a plurality of filters, time delays, amplifiers, switches, and acoustic retinas for applying predetermined signals to the acoustic retinas act in a complimentary reciprocal fashion in the recovery of signals.