초록 ▼

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, t

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.

대표청구항 ▼

An antenna with three-dimensional coverage and electronic scanning, said antenna being of the randomly-distributed, rarefied, volume array type, with a fixed array comprising a plurality of elementary antennas each having a substantially omnidirectional radiation pattern, said elementary antennas be

An antenna with three-dimensional coverage and electronic scanning, said antenna being of the randomly-distributed, rarefied, volume array type, with a fixed array comprising a plurality of elementary antennas each having a substantially omnidirectional radiation pattern, said elementary antennas being distributed according to a statistically isotropic random relationship within a boundary volume which is a volume of revolution, the mean value of the spacing between said elementary antennas being substantially greater than a half wavelength of the minimum frequency to be received or transmitted, each elementary antenna being connected to individually controllable phase-shifter means, wherein said elementary antennas are vertically-oriented dipoles, and wherein said dipoles are each fed by a supply line comprising a first section extending horizontally between the respective dipole and a common vertical tower, said tower being coaxial with said boundary volume which is a volume of revolution.