Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1989-12-12
1991-08-06
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
343890, 343893, H01Q 322, H01Q 324, H01Q 326
Patent
active
050381490
ABSTRACT:
An antenna of the random spare volume array type comprising a plurality of elementary antennas with almost omnidirectional individual radiation distributed according to a statistically isotropic random relationship of distribution within an enveloping volume having a shape generated by revolution, the mean spacing between elementary antennas being notably greater than a half wavelength of the minimum frequency to be received or transmitted, each elementary antenna being connected to an active module comprising individually controllable phase-shifters themselves connected to a common distributor. According to the disclosure, the elementary antennas are formed by dipoles oriented vertically and supplied by a supply line comprising a first section, extending horizontally between the respective dipole and a common vertical tower coaxial with the enveloping volume having a shape generated by revolution, and a second section extending to the interior of this tower and ending in the distributor. The antenna thus made has a vertical polarization which is advantageous in many examples of use (navy, secondary radars etc.) with, owing to the use of simple dipoles, a very small reflecting surface that makes it very difficult to localize. Furthermore, through this structure, the first sections of the supply lines may easily be self-supporting for the mechanical support of the dipoles on the common vertical tower formed, for example, by a ship's mast.
REFERENCES:
patent: 3653057 (1972-03-01), Charlton
patent: 4052723 (1977-10-01), Miller
patent: 4825222 (1989-04-01), Butcher
Patent Abstracts of Japan, vol. 12, No. 60, (E-584) (2907), Feb. 23, 1988, & JP-A-62 203402, T. Shiokawa, "Antenna System for Mobile Satellite Communication".
Aubry Claude
Pourailly Jean-Louis
Roger Joseph
"Thomson-CSF"
Blum Theodore M.
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