SICL Excited Dual Band Uniform Crossed Dipole Array for Endfire Applications at 5G Millimeter Wave Frequencies

This paper presents a novel technique to implement crossed dipole antenna fed by Substrate Integrated Coaxial Line (SICL) technology. The inherent advantage of out of phase surface current of the SICL transmission line is utilized efficiently to excite the two dipole antennas. The crossed dipole is implemented such as to obtain dual band response at 26 GHz and 28 GHz. Two ±45° inclined dipoles are printed on the top/bottom of the substrate and simultaneously fed by top/bottom plate of the SICL line. The other arm of the dipole is printed in between the two substrate of the SICL line and is excited by the middle strip of the SICL line. A SICL 1:4 power divider is employed to feed four crossed dipole antenna to form an array. The array exhibits a gain of 9.7 dBi and 10 dBi at 26 GHz and 28 GHz respectively with wide impedance bandwidth of 3.1 GHz. The cross polarization level better than 20 dB and Front-to-Back Ratio better than 17 dB is obtained for the proposed design. The proposed antenna finds its suitability for the much focused 5G millimeter wave frequency bands.