Communications: radio wave antennas – Antennas – Wave guide type
Patent
1982-12-10
1985-07-23
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
H01Q 1302
Patent
active
045311315
ABSTRACT:
A radio frequency antenna comprising a rectangular waveguide having opposing relatively concave-shaped narrow side wall portions extending from a rear wall of the waveguide structure to an aperture of the antenna element. The separation between the sidewalls, at a distance intermediate the rear wall and the aperture, is greater than the width of the aperture. The waveguide includes a ridge-shaped feed structure extending from the rear wall to the aperture. A pair of ground plane conductors having surfaces each with an edge terminating along an aperture edge of a corresponding one of the sidewalls at the periphery provide a pair of aperture edges. Each one of the ground plane conductors extends for a length greater than .lambda./3 where .lambda. is the wavelength at the lowest operating frequency of the antenna. With such arrangement, an antenna element is provided having a relatively constant beam width over the operating bandwidth of the antenna.
REFERENCES:
patent: 2398095 (1946-04-01), Katzin
patent: 3698000 (1972-10-01), Landry
patent: 4063248 (1977-12-01), Debski et al.
patent: 4353072 (1982-10-01), Monser
patent: 4353074 (1982-10-01), Monser et al.
Landstorfer et al., "Very Short Horn Antennas for Arbitrary Polarization," Proceedings-9th European Microwave Conference, Brighton, England, 17-20 Sep. 1979, pp. 186-190.
Lieberman Eli
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
Wimer Michael C.
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