H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/54
H01Q 15/16 (2006.01) H01Q 15/00 (2006.01) H01Q 15/24 (2006.01) H01Q 19/12 (2006.01)
Patent
CA 1105613
ABSTRACT OF THE DISCLOSURE 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 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 position 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 the lie only along edges of planes normal to the antenna axis. Preferably the second surface is spaced radially outwardly of the first surface.
309005
Her Majesty The Queen In Right Of Canada As Represented By The M
Pascal & Associates
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