Communications: radio wave antennas – Antennas – Wave guide type
Patent
1986-05-28
1988-04-26
Sikes, William L.
Communications: radio wave antennas
Antennas
Wave guide type
343762, 343772, 343776, H01Q 1302
Patent
active
047407956
ABSTRACT:
A dual frequency antenna feed includes colinear axially spaced coaxial and circular waveguide cavities separated by a conducting portion having a high frequency rectangular waveguide therein extending radially outward. The coaxial cavity includes a tubular inner conductor having a polarization rotator connected to the rectangular waveguide for propagating high frequency energy. Four small coaxial transmission lines equiangularly disposed about the cavity axes and terminating in probes about a quarter wavelength from the end of each cavity intercouples the circular and coaxial cavities. The end of the coaxial waveguide cavity forms an aperture for high frequency energy from the conducting inner tube and for the low frequency energy from the region between the conducting inner tube and the cylinder surrounding the outside of the cavity. The radiating aperture is surrounded by a set of concentric conducting rings.
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patent: 4414516 (1983-11-01), Howard
patent: 4504836 (1985-03-01), Seavey
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Rudge, A. W., et al., The Handbook of Antenna Design, vol. I, Peregrinus Press, London, UK, 1982, pp. 654-659.
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The Seavey ESR 124 Dual Band Feed, Satellite World, Mar. 1985, pp. 32-35.
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Hieken Charles
Johnson Doris J.
Seavey Engineering Associates, Inc.
Sikes William L.
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