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COLLAPSIBLE HYPERBOLIC REFLECTOR FORMED OF SPACED WIRES
COLLAPSIBLE HYPERBOLIC REFLECTOR FORMED OF SPACED WIRES
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机译：缝线型可折叠双曲面反射器
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摘要
1,213,852. Aerials. THOMSON-CSF. 2 Jan., 1968 [9 Jan., 1967; 16 May, 1967], No. 333/68. Heading H4A. An aerial having a collapsible reflector comprises two circular supports 1, 2, Fig. 2, to which are fixed at their respective ends two crossed assemblies of wires 3, 3SP1/SP. When the circular supports are spaced apart in their operative positions, the two assemblies of wires lie along the surface of an hyperboloid of revolution. Radiating elements A 1 , A 2 . . . An are mounted in a circle approximately coinciding with the locus of the focus of a parabola which is osculatory to the generating hyperbola at its apex. A group of adjacent elements is energized, with suitable phase and amplitude differences between them, and scanning is obtained by stepping around the circle. The aerial is applicable to a spin-stabilized communcations satellite, as it is stowable for launching and provides means for counter-rotating a radio beam, to maintain it pointing towards an earth station. The individual wires of the systems 3, 3SP1/SP may be provided with tensioning springs at their ends, outside the supports 1, 2 (Fig. 7, not shown), and the said supports may carry, respectively, a central piston 16, Fig. 8, and a co-operating cylinder 15. The piston is moved from an inner retracted position to an outer expanded position by gas pressure or other means and is locked in the latter position by a spring-loaded plunger 18 which enters a recess in the cylinder. In a second embodiment (Fig. 4, not shown), two concentric hyperboloids of revolution are provided between two circular supports. The inner hyperboloid is formed by two crossed assemblies of wiers, whilst the outer hyperboloid is formed by one assembly of wires. In this way, linearly polarized waves from the radiating elements may be transformed on reflection into circularly polarized waves. Means are described for compensating for the effect of the varying spacing between the wires of the outer hyperboloid, from the equatorial plane to the circular supports, by suitable choice of the parameters of the hyperboloids. In another embodiment (Fig. 6a, not shown) a single truncated hyperboloidal reflector is used, and in others (Figs. 6b, 6c, not shown) two or more coaxial hyperboloid reflectors are used.
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