A Compact Circular Polarization Antenna Using Folded Ground Elements Kim, Kwang-Seok ; Kim, Ghoo ; Chae, Soo-Chang ; Jo, Hye-Won ; Yu, Jong-Won ; Lee, Han Lim Abstract Publication: IEEE Transactions on Antennas and Propagation Pub Date: May 2019 DOI: 10.1109/TAP.2019.2902736 Bibcode: 2019ITAP...67.3472K