Reduced back lobe spiral antenna

Details Reduced back lobe spiral antenna Reduced back lobe spiral antenna

1989-01-03

1989-09-19

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Spiral or helical type

H01Q 136

Patent

active

048685798

ABSTRACT:
A ferrite sleeve placed about the cavity portion of an antenna reduces back lobe radiation without degrading the antenna's front hemisphere radiation pattern. The thickness of the ferrite sleeve is selected such that the sleeve highly attenuates the surface currents on the cavity at the lower end of the operating frequency range of the antenna.

REFERENCES:
patent: 3686674 (1972-08-01), Clasby et al.
patent: 4032921 (1977-06-01), Sikina Jr. et al.
patent: 4085406 (1978-04-01), Schmidt et al.
patent: 4459596 (1984-07-01), Flam

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