Communications: radio wave antennas – Antennas – Slot type
Patent
1985-01-04
1987-06-09
Lieberman, Eli
Communications: radio wave antennas
Antennas
Slot type
343846, H01Q 138, H01Q 1310
Patent
active
046723862
ABSTRACT:
An antenna suitable for the generation of a circularly polarized annular radiation pattern comprising a substrate spaced apart from a ground plane by a layer of dielectric material, the substrate being arranged to carry on one side thereof a conductive layer in which a plurality of radial slots is defined equiangularly disposed to extend outwardly from a central region of the substrate, and on the other side thereof a microstrip feed line arrangement via which the radial slots are arranged to be fed with microwave energy for the generation of a horizontally polarized radiation pattern and via which an edge slot defined between the peripheral edge of the layer and the ground plane is arranged to be fed with microwave energy for the generation of a vertically polarized radiation pattern whereby the horizontal pattern and the vertical pattern in combination afford the circularly polarized annular radiation pattern.
REFERENCES:
patent: 3832716 (1974-08-01), Plunk et al.
patent: 4242685 (1980-12-01), Sanford
patent: 4443802 (1984-04-01), Mayes
patent: 4547779 (1985-10-01), Sanford et al.
Lieberman Eli
Plessey Overseas Limited
Wimer Michael C.
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