Antenna with circular polarization, notably for antenna array

Details Antenna with circular polarization, notably for antenna array Antenna with circular polarization, notably for antenna array

1990-10-31

1992-12-15

Hille, Rolf

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343795, 343820, 343905, H01Q 21260, H01Q 9280, H01Q 21240

Patent

active

051721287

ABSTRACT:
An antenna system capable of both circular and linear polarization. The antenna structure includes a symmetrical stripline 90.degree. hybrid coupler, having first and second output branches. A first and second dipolar radiating element is provided, each of the radiating elements having two quarter wave branches formed by folding the stripline conductors. In the first dipolar radiating element, the peripheral conductors of the stripline coupler are folded in the same direction, transverse to the axis of the stripline, and another quarter wave branch is formed by extending the center conductor of the first output branch of the hybrid coupler in an opposite direction. The second dipole radiating element is similarly configured to have two quarter wave branches, comprising the peripheral conductors and the center conductor of a second output branch of the 90.degree. coupler. A second 90.degree. hybrid coupler connected in cascade with the first one permits the selection of either rectilinear polarization or circular polarization to be realized.

REFERENCES:
patent: 3725943 (1973-04-01), Spanos
patent: 3797020 (1974-03-01), Roger et al.
patent: 4772890 (1988-09-01), Bowen et al.
patent: 4774520 (1988-09-01), Bouko et al.
patent: 4983987 (1991-01-01), Woloszczuk

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