A Radial Line Slot Antenna for an Elliptical Beam Nguyen, Tung ; Ueda, Hideki ; Hirokawa, Jiro ; Ando, Makoto Abstract Publication: IEEE Transactions on Antennas and Propagation Pub Date: December 2012 DOI: 10.1109/TAP.2012.2213055 Bibcode: 2012ITAP...60.5531N