Multi-mode dual circularly polarized spiral antenna

Details Multi-mode dual circularly polarized spiral antenna Multi-mode dual circularly polarized spiral antenna

1993-11-02

1995-09-19

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Spiral or helical type

343789, H01Q 136

Patent

active

054519730

ABSTRACT:
A spiral antenna is provided which is capable of providing dual circular polarization operation with a large number of operating modes. The spiral antenna includes at least eight conductive spiral antenna arms extending outward about an axis of rotation. Each antenna arm has an inner end and an outer extending end and a plurality of arm width modulations formed therebetween for achieving dual circular polarization operation capability. Electrical feeds are coupled to the inner end of each of the spiral antenna arms. A feed network may be further connected to the electrical feeds for providing predetermined phase excitations to the corresponding spiral antenna arms so as to achieve the desired operating modes.

REFERENCES:
patent: 3681772 (1972-08-01), Ingerson
patent: 3828351 (1974-08-01), Voronoff
patent: 4243993 (1981-01-01), Lamberty et al.
patent: 4605934 (1986-08-01), Andrews
patent: 4962383 (1990-10-01), Tresselt

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