Circularly polarized, broadside firing tetrahelical antenna

Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin

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343895, H01Q 136

Patent

active

039407721

ABSTRACT:
An antenna for radiating circularly polarized signals omnidirectionally about and broadside a support mast is provided by four conductors helically wound about the mast. The conductors are spaced from the mast and are equally distributed about the periphery of the mast with signals coupled to the conductors such that the phase of the signal coupled to one conductor is 180.degree. out of phase with the phase of the signal coupled to adjacent conductors and is in phase with the phase of the signal coupled to the alternate conductor. The pitch of the helically wound conductors is selected relative to the radius of the conductors to achieve substantially circularly polarized radiation substantially perpendicular or broadside to the lengthwise axis of the mast.

REFERENCES:
patent: 3449657 (1969-06-01), Fredriksson et al.
patent: 3503075 (1970-03-01), Gerst
patent: 3599220 (1971-08-01), Dempsey

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