Radio frequency apparatus

Details Radio frequency apparatus Radio frequency apparatus

1991-07-25

1993-03-02

Hille, Rolf

Communications: radio wave antennas

Antennas

Spiral or helical type

343850, H01Q 136, H01Q 2120

Patent

active

051913526

ABSTRACT:
A quadrifilar radio frequency antenna intended primarily for receiving signals from an earth orbiting satellite for navigation has four helical wire elements shaped and arranged so as to define a cylindrical envelope. The elements are co-extensive in the axial direction of the envelope and are mounted at their opposite ends in two printed circuit boards lying in spaced apart planes perpendicular to the axis with the end parts of the elements being soldered to conductor tracks on the boards, the tracks constituting impedance elements between the helical elements and between the helical elements and an axially located coaxial feeder. The conductor tracks are such that the effective length of one pair of helical elements and associated impedance elements is greater than that of the other pair and associated impedance elements. In this way, phase quadrature between the two pairs is obtained at the operating frequency without using differently shaped helical elements, and with little or no adjustment of the elements in the manufacturing process.

REFERENCES:
patent: 2835893 (1958-05-01), Braund
patent: 4295144 (1981-10-01), Matta et al.
patent: 4608574 (1986-08-01), Webster et al.
Kilgus, "Resonant Quadrifilar Helix Design", the Microwave Journal, Dec. 1970, pp. 49-54.

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