Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1984-03-26
1986-10-07
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342368, 342371, 342383, H01Q 312
Patent
active
046162313
ABSTRACT:
A narrow-band phase shift beamformer system is disclosed. The outputs from the elements in a transducer array are each divided into two components whose amplitudes are respectively proportional to the sine and cosine of the required phase shift, which are then processed so that the steered beam may be formed by coherent summation. The proportionalities of the respective sine and cosine components are achieved by switched capacitor circuits, which are preferably implemented by LSI circuits, permitting substantial hardware savings and yielding highly accurate component proportionalities.
REFERENCES:
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patent: 3863258 (1975-01-01), Clark
patent: 3905009 (1975-09-01), Hughes et al.
patent: 3909751 (1975-09-01), Tang et al.
patent: 4228531 (1980-10-01), Bogert et al.
patent: 4484358 (1984-11-01), Iwahashi
patent: 4532515 (1985-07-01), Cantrell et al.
International Search Report for PCT/US/00248, dated Jun. 7, 1985.
J. J. Brady, "A Narrow-Band Phase Shift Beamformer Suitable for Integrated Circuit Implementation," J. Acoustical Soc. America, vol. 67, No. 3, pp. 1065-1077.
J. T. Caves et al., "Sampled Analog Filtering Using Switch and Capacitors as Resistor Equivalents," IEEE Journal of Solid-State Cir., vol. SC12, No. 6, Dec. 1977, pp. 592-599.
Autrey Samuel W.
Drab Harold G.
Blum Theodore M.
Cain David
Hughes Aircraft Company
Karambelas A. W.
Thompson Robert
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