Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1980-02-01
1982-05-25
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367155, 367103, 367905, H04B 1300
Patent
active
043320180
ABSTRACT:
A wide band, substantially constant beamwidth, frequency independent, scable 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 signals at the lowest frequencies. When used as a transmitter, a wide band source supplies a broad band frequency signal to a plurality of filters, time delays, amplifiers, switches and acoustic retinas for applying predetermined signals to the acoustic lenses. When used as a receiver the same plurality of filters, time delays, amplifiers, switches and acoustic retinas act in a complimentary reciprocal fashion in the recovery of signals. The geometrical distribution of the various frequencies over the array described above produces a substantially constant effective aperture to wavelength ratio independent of frequency for the antenna as a whole which results in formation of a substantially constant beamwidth, frequency independent beam while the time delays, being dependent only on the lens spacing and the scan angle and not on the wavelength provide for scanning independent of frequency.
REFERENCES:
patent: 3090030 (1963-05-01), Schuck
patent: 3364461 (1968-01-01), Trott
patent: 3457543 (1969-07-01), Akervold et al.
patent: 3601789 (1971-08-01), Sullivan
patent: 3928839 (1975-12-01), Warner et al.
patent: 4045800 (1977-08-01), Tang et al.
patent: 4158189 (1979-06-01), Wardle
patent: 4168482 (1979-09-01), Sternberg
patent: 4186398 (1980-01-01), Minnett
patent: 4218768 (1980-08-01), Hasslu
Anderson Warren A.
Sternberg Robert L.
Beers Robert F.
McGill Arthur A.
The United States of America as represented by the Secretary of
Tudor Harold J.
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