Communications: radio wave antennas – Antennas – Wave guide type
Patent
1991-12-13
1994-05-03
Ham, Seungsook
Communications: radio wave antennas
Antennas
Wave guide type
343754, 333156, 333157, 342368, H01Q 330, H01P 118
Patent
active
053091663
ABSTRACT:
A phased array antenna includes an array of phase shifters, each shifter being operable for shifting the phase of RF energy passing therethrough. Each shifter includes a quantity of ferroelectric material disposed throughout a region. RF energy propagating from a source passes through the material. A thin conductive electrode is disposed in the center of the material, the electrode having a bias voltage imposed thereon. Such voltage creates an electric field across the material, which for a uniaxial ferroelectric orients the optic axis of the material in a direction which is both normal to the direction of propagation of the RF energy and parallel to the polarization direction of the RF energy. The electric field changes the wave propagation constant (i.e., for a uniaxial ferroelectric, the extraordinary wave refractive index, n.sub.e), producing a varying path length of the RF energy in the material, resulting in a controllable alteration of the phase of the RF energy. The varying phase shift produced by each phase shifter controls the antenna's radiating direction.
REFERENCES:
patent: 2505424 (1950-04-01), Moseley
patent: 4323901 (1982-04-01), De Wames et al.
patent: 4636799 (1987-01-01), Kubick
patent: 4706094 (1987-11-01), Kubick
patent: 4809011 (1989-02-01), Kunz
patent: 4987418 (1991-01-01), Kosowsky et al.
patent: 5032805 (1991-07-01), Elmer et al.
Collier Donald C.
Krug Kevin J.
Kustom Brittan
Ham Seungsook
Kosakowski Richard H.
O'Shea Patrick J.
United Technologies Corporation
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