The aperture-coupled helix antenna

Planar arrays with circular polarization are frequently used in a large variety of applications. The typical choices are quite limited when size, bandwidth, efficiency, and simplicity are important. The paper proposes a new type of radiating element that seems to cope with all these requirements. The well-known helix antenna is fed by a slot in the ground plane of a microstrip-feeding line. The measurements show a successful combination of the excellent characteristics of the helix antenna, with the simplicity of fabrication of the microstrip networks