Communications: radio wave antennas – Antennas – Antenna components
Patent
1985-09-04
1987-07-28
Lieberman, Eli
Communications: radio wave antennas
Antennas
Antenna components
H01Q 1520
Patent
active
046834753
ABSTRACT:
A portable lightweight folding parabolic reflector antenna for reception of microwave signals includes an axial waveguide tube which constitutes the main structural supporting member of the antenna, a ten- to fifteen-foot diameter dish mounted to the waveguide and a sub-reflector supported at the forward end of the waveguide. A low noise amplifier may be mounted to the rear end of the waveguide for amplification of the received signals. The folding dish includes a single sheet of resiliently elastic reflecting mesh supported by a radial framework of normally straight resiliently flexible spokes of tapering cross section. The spokes are pivotable by a lever system between a folded axial position and a deployed radial position. The normally straight spokes are stressed upon deployment by a perimeter cable to the desired parabolic or spherical curvature and the elastic mesh is stretched over the convex side of the radial framework by the perimeter cable, so that the mesh assumes the curvature of the radial spokes to present a dished parabolic reflecting surface towards the subreflector.
REFERENCES:
patent: 2072262 (1937-03-01), Herzog et al.
patent: 2539511 (1951-01-01), Hansen et al.
patent: 4249184 (1981-02-01), Vines
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