Low-loss Circularly Polarized Periodic Leaky-Wave Antenna

(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other worksThis letter presents a periodic leaky-wave array antenna with circular polarization at millimeter-wave frequencies. The antenna is designed on the low-loss planar Goubau transmission line to maximize the radiation efficiency of the antenna. The unit cell of the array is formed by four dipoles located on both faces of the Goubau line s substrate. A prototype has been fabricated and measured. Experimental results show an impedance bandwidth above 15% for S11 < - 10 and a 3-dB axial-ratio bandwidth of 7.6%. The radiation efficiency and maximum gain of the prototype are above 90% and 15.6 dBi, respectively, from 38 to 41 GHz. The maximum gain and the minimum axial ratio present the characteristic steering behavior of leaky-wave antennas.This work was supported by the Spanish Ministry of Education and Science (Ministerio de Educacion y Ciencia) under Projects TEC2010-20841-C04-01, TEC2013-47360-C3-3-P, and CSD2008-00068.Sánchez-Escuderos, D.; Ferrando Bataller, M.; Herranz Herruzo, JI.; Rodrigo Peñarrocha, VM. (2016). Low-loss Circularly Polarized Periodic Leaky-Wave Antenna. IEEE Antennas and Wireless Propagation Letters. 15:614-617. doi:10.1109/LAWP.2015.2463672S6146171