@ARTICLE {2228,
author={M. G. Silveirinha},
doi={10.1109/TAP.2007.915428},
journal={IEEE Transactions on Antennas and Propagation},
title={Design of Linear-to-Circular Polarization Transformers Made of Long Densely Packed Metallic Helices},
year={2008},
month={February},
volume={56},
number={2},
pages={390-401},
ISSN={0018-926X}
}