Golubovic, Ruzica; Mosig, Juan (Laboratory of Electromagnetics and Acoustics, Ecole Polytechnique Fédérale de Lausanne, Station 11, 1015 Lausanne, Switzerland)
Djordjevic, Antonije; Olcan, Dragan (University of Belgrade, School of Electrical Engineering, P.O. Box 35-54, 11120 Belgrade, Serbia)
We investigate nonuniformly-wound helical antennas without ground plane (antenna counterbalance is a wire pigtail), with aim to maximize RHCP gain. By optimizing radii and pitches of these antennas, we obtain antennas with the gain that is very close to the gain of the optimal uniformly-wound helical antennas with infinite ground plane, while the obtained nonuniform antennas are smaller and handier.