The geometry proposed is based on a conical log-spiral antenna. This is the origin of the name of the solution we have selected, devoted to the impressive work on this kind of antennas developed by Prof. Dyson.
The conical antenna with associated parameters is on the right.
The solution proposed with dual circular polarization (conical Quad-Spiral Array-DYQSA): to achieve a dual-polarized performance, we can use an array of 4 elements of conical log-spiral array which called. In this design, two antennas are devoted to one polarization and the other two antennas are devoted to the opposite one. The angle between the axis of the cones and the z-axis is 16°.