Antenna providing hemispherical omnidirectional coverage

Details Antenna providing hemispherical omnidirectional coverage Antenna providing hemispherical omnidirectional coverage

1995-08-07

1997-08-05

Wimer, Michael C.

Communications: radio wave antennas

Antennas

High frequency type loops

343830, 343844, 343846, 343855, H01Q 938, H01Q 2124

Patent

active

056547242

ABSTRACT:
An antenna having an omnidirectional pattern in azimuth and coverage throughout a hemisphere. The radiating elements are four half-loops mounted on a ground plane. Each half-loop is approximately one-half wavelength in length with one end grounded to the ground plane and the other end fed in opposition to the ground plane. The image produced by the ground plane of each half-loop, together with the actual half-loops give the effect of a set of four complete loops, each of which complete loops is approximately one wavelength in circumference. The elements are nominally located in planes normal to the ground plane that pass through a central point in the ground plane. The planes of the elements are oriented nominally at 90 degree intervals about a central point and the centers of the elements are offset from the central point of the ground plane by approximately one-quarter wavelength. The combination of elements produces an omnidirection radiation pattern in azimuth. The radiation pattern contains no null on axis, but does exhibit a moderately reduced intensity on axis. With altered phasing of the elements and the number of driven elements, the antenna can provide monodirectional coverage of a hemisphere, or bidirectional or multidirectional coverage within a hemisphere.

REFERENCES:
patent: 4540988 (1985-09-01), Munk et al.
patent: 4611212 (1986-09-01), Lee

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