Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1979-07-11
1982-09-28
Lieberman, Eli
Communications: radio wave antennas
Antennas
With polarization filter or converter
343840, 343909, H01Q 1912
Patent
active
043521088
ABSTRACT:
An omni-directional type passive antenna in which the response pattern is a close approach to the ideal of a hemisphere. The system includes an antenna having an antenna axis extending in the direction of highest antenna sensitivity, and a first surface which is a surface of revolution swept out by a part of a parabolic curve rotated about the antenna axis, the axis of the parabolic curve being inclined at an angle in the range of about 70 to 80 degrees to the antenna axis with the focus of the parabolic curve substantially on the antenna axis. A first set of electrically isolated dipoles is mounted on the surface and all are similarly oriented such that they lie only along edges of axial planes of the antenna. The system also includes a second surface which is a surface of revolution swept out by a part of a parabolic curve rotated about an antenna axis, the axis of the parabolic curve being inclined at a similar angle at the first surface, with the focus of the latter parabolic curve at the same positon as the focus of the first surface. The second surface is spaced radially of the first surface with respect to the antenna axis. A second set of electrically isolated dipoles is mounted on the second surface and all are similarly oriented such that they lie only along edges of planes normal to the antenna axis. Preferably the second surface is spaced radially outwardly of the first surface.
REFERENCES:
patent: 3755815 (1973-08-01), Stangel et al.
patent: 4070678 (1978-01-01), Smedes
Her Majesty the Queen in right of Canada as represented by the
Lieberman Eli
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