Dual frequency reflector antenna feed element

Details Dual frequency reflector antenna feed element Dual frequency reflector antenna feed element

1997-02-25

1999-04-06

Wong, Don

Communications: radio wave antennas

Antennas

Within conductive apertured wall

343840, 343756, 343909, H01Q 142

Patent

active

058924850

ABSTRACT:
A dual frequency feed element for a parabolic reflector antenna system, comprising a conductive cavity having a central axis, the cavity mounted at the focal point of a parabolic reflector surface and defined about its outer perimeter by an upstanding cavity wall, and having a closed cavity floor and an open top directed toward the reflective surface, a dual frequency radiating element centrally disposed in the cavity and arranged to radiate a first low frequency signal out through the cavity open top to the antenna surface, a conductive floor fixed below the radiating element a distance in relation to the radiant energy for the first low frequency signal, and disposed in the cavity transverse to the central axis thereof to reflect radiant energy for the first signal and, a frequency selective surface fixed below the radiating element, apart from the conductive floor, and transverse to the central axis of the cavity to reflect radiant energy for the second, higher frequency signal while simultaneously being invisible to the lower frequency signal.

REFERENCES:
patent: 3740754 (1973-06-01), Epis
patent: 4183027 (1980-01-01), Ehrenspeck
patent: 4668956 (1987-05-01), Mahnad
patent: 4970634 (1990-11-01), Howell et al.
patent: 5384575 (1995-01-01), Wu
patent: 5455594 (1995-10-01), Blashing et al.
patent: 5481272 (1996-01-01), Yarsunas
patent: 5528249 (1996-06-01), Grafford et al.

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