Millimeter wave arrays using Rotman lens and optical heterodyne

Details Millimeter wave arrays using Rotman lens and optical heterodyne Millimeter wave arrays using Rotman lens and optical heterodyne

1996-02-28

1997-10-14

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

342376, 342 54, H01Q 322

Patent

active

056776977

ABSTRACT:
An optical heterodyne system provides the radiation source and beam scan control of a millimeter wave (MMW) array antenna. The heterodyne system is an optical feed system to produce the MMW by mixing the optical outputs from two lasers, distribute the signal source to an array of radiating elements through a Rotman lens and optical fibers, generate the differential phase shift for beam scan in the optical domain, change the beam direction by switching the input laser being used to illuminate the Rotman lens or by varying the frequency of one of the laser sources. The feed system includes a plurality n-1 lasers spaced along the transmit side of the lens, and a center laser disposed on the center axis of the transmit side. A l:n switch receives a command input to determine which of the n-1 lasers will operate. The beat frequency between the center laser operating frequency and that of the n-1 lasers is the MMW frequency. N optical receive elements are spaced along the output side of the Rotman lens and are connected to a corresponding photodetector by equal length optical fibers. The output of each photodetector is amplified and fed to a corresponding radiating element. The system also operates in a corresponding receive mode.

REFERENCES:
patent: 4803490 (1989-02-01), Kruger
patent: 4929956 (1990-05-01), Lee et al.
patent: 5128687 (1992-07-01), Fay
patent: 5333000 (1994-07-01), Hietala et al.
patent: 5543805 (1996-08-01), Thaniyavarn

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