Communications: radio wave antennas – Antennas – Antenna components
Patent
1988-03-16
1988-11-22
Sikes, William L.
Communications: radio wave antennas
Antennas
Antenna components
343753, 343872, 343911R, H01Q 1700
Patent
active
047869151
ABSTRACT:
It is sometimes necessary to reduce the power of microwave transmissions, e.g. to avoid overloading a receiver or to reduce a transmitter's potential to cause interference. The invention reduces the power by inserting radiation absorbent material into the aperture of the antenna. In the preferred embodiment a membrane of absorbent plastics is stretched across the aperture of the dish reflector.
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patent: 3740755 (1973-06-01), Grezenback
patent: 3877920 (1975-06-01), Wright et al.
patent: 4169268 (1979-09-01), Schell et al.
patent: 4282530 (1981-08-01), Semplak
patent: 4364053 (1982-12-01), Hotine
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patent: 4480256 (1984-10-01), Wren
Armed Services Technical Information Agency, Unclassified 97965, Jul. 31, 1957.
Butcher Miles E.
Cartwright Norman E.
British Telecommunications public limited company
Johnson Doris J.
Sikes William L.
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