Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1997-11-28
2000-05-23
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
343754, 343778, 343785, 333156, 333157, H01Q 322, H01Q 324, H01Q 326
Patent
active
060670479
ABSTRACT:
A user terminal (110) which comprises an electrically-controllable back-fed antenna (300, FIG. 3) is used for the formation of single and multiple beams. The electrically-controllable back-fed antenna comprises an RF power distribution/combination network (310), electrically-controllable phase-shifting elements (320), a control network (440, FIG. 4) and radiating/receiving elements (360). The control network is coupled to the electrically-controllable phase-shifting elements and is used for controlling the dielectric constant of dielectric material contained within the electrically-controllable phase-shifting elements. In a preferred embodiment, phase-shifting elements comprise waveguide sections containing at least one dielectric material, and the dielectric material includes a ferroelectric material, preferably comprising Barium Strontium Titanate (BST).
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Brookner, E., "Major Advances in Phased Arrays: Part II", Microwave Journal, Jun. 1997, pp. 84, 86, 88, 91, 92.
Buer Kenneth Vern
Cook Dean Lawrence
Corman David Warren
Dendy Deborah Sue
Blum Theodore M.
Klekotka James E.
Motorola Inc.
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