Datron/transco Inc.

Titan Systems, Corporation

Tai-Tseng Chu

Amedeo Larussi

The invention utilizes two nominally orthogonal probes to couple selectively to two orthogonal modes propagating in a microwave waveguide and horn. The waveguide and horn utilize internal ridges to obtain broad bandwidth and the two probes are located in substantially the same plane in order to avoid introducing large changes in the relative phases of the two modes propagating within the waveguide with changes in frequency over the operating bandwidth of the device. The middle portion of each probe is bent or deformed to the extent needed to avoid physical conflict and electrical contact between the probes, while still avoiding the introduction of substantial phases differences between the modes excited by the respective probes.

Quad-ridged feed horn with two coplanar probes

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.

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Simi Valley, CA, United States of America

Tai-Tseng Chu