Communications: radio wave antennas – Antennas – Including magnetic material
Patent
1993-04-26
1995-09-12
Hajec, Donald
Communications: radio wave antennas
Antennas
Including magnetic material
343785, 343786, H01Q 100
Patent
active
054500923
ABSTRACT:
The ferroelectric scanning RF antenna includes a ferroelectric material having conductors deposited thereon that are connected to an adjustable d.c. or a.c. voltage source. The scanning antenna is placed in an RF transmission line that includes appropriate input and output impedance matching devices such as quarter-wave transformers. The scanning section of the RF scanning antenna is constructed of two prismatic structures of a ferroelectric material. When the two prismatic structures are at the same zero bias voltage, then the RF energy passing through the antenna is not deflected and a boresight radiation pattern is obtained. Application of a bias voltage reduces the permittivity and the refractive index of the outer prismatic structure. The RF energy is refracted away from the normal at the interface between the prismatic surfaces and the radiation pattern is scanned in one direction. Application of a bias voltage reduces the permittivity and the refractive index of the inner prismatic structure. The input RF energy is refracted towards the normal at the boundary of the two prismatic surfaces and the RF radiation pattern is scanned in the opposite direction. The scanning part of the ferroelectric scanning RF antenna may be embedded as part of a monolithic microwave integrated circuit. The scanning part of the ferroelectric scanning RF antenna may be constructed of a thin ferroelectric film. The copper losses is reduced by using a high Tc superconductor material as the conducting surface. The ferroelectric material is operated in the paraelectric phase slightly above its Curie temperature.
REFERENCES:
patent: 4809011 (1989-02-01), Kunz
patent: 5032805 (1991-07-01), Elmer et al.
Walker, "Superconducting Superdirectional Antenna Arrays", IEEE Transactions On Antennas And Propagations, vol. AP-25, No. 6, Nov. 1977, pp. 885-887.
Hajec Donald
Le Hoang-anh
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