Variable circular polarization antenna having parasitic Z-shaped

Details Variable circular polarization antenna having parasitic Z-shaped Variable circular polarization antenna having parasitic Z-shaped

1988-10-20

1990-02-06

Hille, Rolf

Communications: radio wave antennas

Antennas

Slot type

343727, 343770, 343890, H01Q 1312, H01Q 1114

Patent

active

048991651

ABSTRACT:
A specially designed, Z-shaped, parasitic dipole is spaced radially outwardly from the slot provided in a cylindrical antenna; a controlled amount of energy which is in a horizontally polarized direction is coupled to the Z-shaped dipole so as to radiate energy into the vertical plane, thus creating a variable circularly polarized antenna capable of adding a selectable amount of vertical component to the horizontal in quadrature; since the dipole element, which parasitically develops its polarized energy, is in the same horizontal plane as the polarized energy emanating from the slot, a good, i.e. constant, axial ratio is maintained throughout the elevation pattern.

REFERENCES:
patent: 4119970 (1978-10-01), Bogner et al.
patent: 4129871 (1978-12-01), Johns
patent: 4223315 (1980-09-01), Alford

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