Communications: radio wave antennas – Antennas – Antenna components
Patent
1980-09-18
1982-12-14
Moore, David K.
Communications: radio wave antennas
Antennas
Antenna components
343840, H01Q 1520
Patent
active
043640532
ABSTRACT:
A spherical reflector of microwaves is formed by a thin metallic coating laminated to the inside of a semi-hemispherically formed thin plastic sheet joined equatorially by a short rigid cylindrical support member to another thin semi-hemispherically formed thin plastic sheet which is transparent to microwaves. A thin wall plastic tube which is transparent to microwaves is externally joined to and extends through the cylindrical central support member at the focal plane of the reflector to provide trunnions fitting external bearings in a mounting frame to enable adjustment of antenna beam elevation angle. The interior of the trunnion tube provides support and variable positioning for the antenna feed along the focal plane for limited adjustment of antenna beam azimuth angle. The joints between the members are sealed to be airtight and the assembly is inflated to pressurize the interior and stress the hemispherical plastic skin to form a highly accurate spherical reflector and mounting with capability of adjustment of beam direction along two orthogonal axes. The construction may alternatively employ a parabolically formed reflector with the antenna feed fixed at the focal point, which requires steering the reflector assembly mounting frame for adjustment of antenna beam azimuth angle.
REFERENCES:
patent: 2913726 (1959-11-01), Currie et al.
patent: 3005987 (1961-10-01), Mack et al.
patent: 3056131 (1962-09-01), McCreary
patent: 3075191 (1963-01-01), Peay
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