TY - CONF T1 - Reduction of Orbital Angular Momentum Radio Beam Divergence Using a 3D Printed Planar Graded Index Lenses JO - 12th European Conference on Antennas and Propagation (EuCAP 2018) PY - 2018/01/01 AU - Allen B AU - Drysdale TD AU - Zhang S AU - Isakov D AU - Tennant A AU - Whittow W AU - Stevens C AU - Vardaxoglou J AU - Coon J ED - DO - DOI: 10.1049/cp.2018.0442 PB - Institution of Engineering and Technology SN - 9781785618161 Y2 - 2025/05/29 ER -