Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1988-09-10
1990-05-29
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342 54, H01Q 300
Patent
active
049299565
ABSTRACT:
A wideband, true time delay antenna beamforming network 10 for millimeter wave phased array antennas is disclosed herein. The beamforming network 10 of the present invention includes a laser 30 for generating a beam B of electromagnetic energy. The beamforming network 10 further includes an electro-optic modulator 40 for modulating the beam B in response to an input signal S modulated about a first frequency f.sub.o. A first antenna array 80 generates a first electromagnetic field pattern P by radiating the modulated beam B' in a first direction. The present invention further includes a constrained lens 90 for receiving the first field pattern P and for emitting an antenna driver feed beam F in a second direction in response thereto. An antenna array driver 115 electro-magnetically coupled to the constrained lens 90 by the feed beam F provides a set of signals modulated about the first frequency f.sub.o to drive an antenna array 20.
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T. R. Joseph et al, "Applications of Microwave Fiber Optic Links", Antennas and Propagation, vol. 1, Jun. 15-19, 1987, pp. 422-425.
J. McFarland et al, "Multiple-Beam Constrained Lens", Microwaves, Aug. 1963, pp. 82-89.
Lee Jar J.
Yen Huan-Wun
Blum Theodore M.
Coble P. M.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Aircraft Company
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