Quadrifilar helix antenna

Details Quadrifilar helix antenna Quadrifilar helix antenna

1991-10-21

1994-09-20

Hille, Rolf

Communications: radio wave antennas

Antennas

Spiral or helical type

333 26, 343859, 343863, H01Q 1108, H01Q 136

Patent

active

053493656

ABSTRACT:
An improved helix antenna including a single unitary antenna having plural radiating elements extending radially from a common junction. A microstrip balun is connected to the plural antenna elements at the common junction. In a particular embodiment, the antenna includes four radiating elements arranged in a helical pattern and mounted such that a longitudinal axis extending through the axial center of the antenna is coincident with a longitudinal axis of the microstrip balun. One or more of the radiating elements includes a semi-circular loop to create phase relationships necessary for a circularly polarized beam pattern. The microstrip balun includes a transmission line and a ground plane on opposite sides of a dielectric substrate. The transmission line and the ground plane are tapered for impedance matching between the input and the output thereof.

REFERENCES:
patent: 4008479 (1977-02-01), Smith
patent: 4114164 (1978-09-01), Greiser
patent: 4636802 (1987-01-01), Middleton, Jr.
patent: 4697192 (1987-09-01), Hofer et al.

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