Thomson-csf

Francois Ursenbach

Jean-Marc Martin

The antenna is a rotating dipole antenna comprising a base, a rigid support rotatably mounted on the base, a plurality of wire dipoles fixed to the support, and means to feed each dipole with electrical energy from a first end of said dipole. In order to provide for the efficient fastening of the dipoles, the rigid support extends before at least the first end of each dipole, and this first end is fixed directly to the rigid support while the second ends of the dipoles are either fixed directly to the rigid support or connected to it by a catenary supported on the support. The antenna can be applied to the designing of power antennas in the decametric wave range.

Rotating antenna with wire dipoles

The disclosure concerns an assembly formed by a large-sized antenna with a supporting mast, the working of which brings the ground plane into play, and by a high-power transmitter. To reduce the distance between the transmitter and the radiating part of the antenna, and to reduce the cost of the architectural structure of the antenna and of the room sheltering the transmitter, this room is formed by the base of the mast which supports the antenna. The dimensions and bed of the base of the mast are designed as a function of the space needed and of the stability to be given to the antenna.

Architectural structure combining at least one antenna with supporting

The antenna has a support with a metallic structure and cables. In order to give the antenna good resistance to wind, it is made by means of rigid half-wave dipoles and these dipoles are mounted directly on the mechanical structure.

Rotating antenna with dipoles for hf waves

So as to allow modification of the radiation diagram of a rotary curtain antenna, the doublets of a curtain are distributed in groups of one or several doublets and each group has its own feed line which connects it to a switching box situated in the mast of the antenna and which is constructed so as to bring to the box an impedance inversely proportional to the number of doublets fed by this line; this box allows all or part of the groups of doublets to be fed at will from a mast down line. Dynamic impedance matching cells disposed at the foot of the antenna provide a small standing wave ratio for connection with a transmitter.

Rotary curtain antenna

A harmonic filtering device placed in a high frequency line connecting a radio transmitter to its load with at least one cell in parallel on the line, constituted by an anti-resonant circuit (at the transmission frequency of the transmitter) in series with a resistor, whose value is approximately 1/20th of the characteristic impedance of the line. This cell is made of a coaxial line with four conductors in which inset elements (short-circuit, capacitor, load) form the inductor and the capacitor of the anti-resonant circuit and the resistor. The resistor of this cell has no effect at the transmission frequency of the transmitter and creates insulation between the load and the transmitter for harmonic frequencies.

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Eaubonne, France

Francois Ursenbach