Four wire dual mode spiral antenna

Details Four wire dual mode spiral antenna Four wire dual mode spiral antenna

1982-12-30

1985-02-05

Lieberman, Eli

Communications: radio wave antennas

Antennas

Logarithmically periodic

343891, 343895, H01Q 136, H01Q 1110

Patent

active

044980841

ABSTRACT:
A dual mode broadband antenna especially designed to provide an omni-directional low angle or high angle radiation pattern which is predominately horizontally polarized is disclosed herein. This antenna utilizes four wire radiators in the form of an inverted conical log-spiral supported in a vertically extending fashion a predetermined distance above the horizontal ground plane. In order to alternatively operate the antenna in its high and low angle modes, first and second oppositely phased AC currents are applied to the radiators in two different ways using a simple switching device rather than a more complicated network of four hybrid circuits.

REFERENCES:
patent: 3683390 (1972-08-01), Cory et al.
patent: 3906509 (1975-09-01), DuHamel

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