Compact Ring Slot Antenna With Harmonic Suppression Li, Weiwen ; Wang, Yu ; You, Baiqiang ; Shi, Zhiyuan ; Liu, Qing Huo Abstract Publication: IEEE Antennas and Wireless Propagation Letters Pub Date: December 2018 DOI: 10.1109/LAWP.2018.2877974 Bibcode: 2018IAWPL..17.2459L