Peer-Reviewed Journal Details
Mandatory Fields
Riza, N. A.
1994
June
Applied Optics
ACOUSTOOPTIC LIQUID-CRYSTAL ANALOG BEAM FORMER FOR PHASED-ARRAY ANTENNAS
Validated
()
Optional Fields
33
1717
3712
37243712
A compact phased-array antenna acousto-optic beam former with element-level analog phase (0-2pi) and amplitude control using nematic-liquid-crystal display-type technology is experimentally demonstrated. Measurements indicate >6-bit phase control and 52.6 dB of amplitude-attenuation control. High-quality error calibration and antenna sidelobe-level control is possible with this low-control-power analog beam former. Optical system options using rf Bragg cells or wideband Bragg cells are discussed, with the rf design being the current preferred approach. Transmit-receive beam forming based on frequency upconversion-downconversion by electronic mixing is introduced for the rf Bragg-cell beam former, and comparisons with digital beam forming are highlighted. A millimeter-wave signal generation and control optical architecture is described.A compact phased-array antenna acousto-optic beam former with element-level analog phase (0-2pi) and amplitude control using nematic-liquid-crystal display-type technology is experimentally demonstrated. Measurements indicate >6-bit phase control and 52.6 dB of amplitude-attenuation control. High-quality error calibration and antenna sidelobe-level control is possible with this low-control-power analog beam former. Optical system options using rf Bragg cells or wideband Bragg cells are discussed, with the rf design being the current preferred approach. Transmit-receive beam forming based on frequency upconversion-downconversion by electronic mixing is introduced for the rf Bragg-cell beam former, and comparisons with digital beam forming are highlighted. A millimeter-wave signal generation and control optical architecture is described.
0003-69350003-6935
://WOS:A1994NU49700013://WOS:A1994NU49700013
Grant Details