Patent ID: 9673533
Date: 2017-06-06
CPC Classifications: H01Q

Claim:
1. A radial slot antenna comprising: a radial waveguide including an upper plate having a centroid and an edge region and provided with a plurality of radiating apertures formed as slots in the upper plate and positioned around the centroid, the plurality of radiating apertures comprising a plurality of first radiating apertures and a plurality of second radiating apertures; wherein the plurality of first radiating apertures is arranged in such a way as to form at least one first radiating region, and the plurality of second radiating apertures is arranged in such a way as to form at least one second radiating region, the first and second radiating regions being distinct and radially separated by a dwell region without radiating apertures; wherein the plurality of first radiating apertures of the first radiating region develops along a first spiral path forming a plurality of first turns, and the plurality of second radiating apertures of the second radiating region develops along a second spiral path forming a plurality of second turns; wherein radially adjacent turns in the first spiral are separated from one another by a first mutual radial distance, and radially adjacent turns in the second spiral are separated from one another by a second mutual radial distance; and wherein the first radiating apertures and the second radiating apertures each comprise first grooves and second grooves, (a) the first grooves being arranged immediately one after another along the first spiral path or the second spiral path and being rotated with respect to one another in a counter clockwise direction by a first angular value that increases with a distance from the centroid, and (b) the second grooves being arranged immediately one after another along the first spiral path or the second spiral path and being rotated with respect to one another in a counter clockwise direction by a respective second angular value that increases with the distance from the centroid; said slot antenna further comprising a signal feeder operable for supplying an electromagnetic field so as to assume, in the first and second radiating regions, opposite phases, in such a way that the electromagnetic field emitted by the slot antenna can be expressed via Bessel functions.