en 5-Antenna Antenna Research Paper Research Paper <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="color:#000000;">In this manuscript, higher-order Orbital Angular Momentum (OAM) modes and parameters affecting vortex in the radiation pattern have been studied. A uniform circular array resonating at 10 GHz frequency is formed using eight identical rectangular patch antennas. Three uniform circular arrays are analyzed, simulated, and fabricated for OAM modes 0, +1, and -1 respectively. The higher-order OAM modes &plusmn;2, &plusmn;3, and &plusmn;4 are simulated and their effects on radiation and phase pattern are discussed. The effect of number of antenna elements and radius of the circular array on the phase purity of higher order OAM modes is presented. The results of simulated radiation patterns and phase front are well satisfying the generation of OAM modes. The measured results show a close agreement with the simulated result.</span></span></span></div> Orbital Angular Momentum, Phase Pattern, Vortex, Power Phase Divider Network. 1822 1822 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-3393-2&slc_lang=en&sid=1 S. Singh ss523@snu.edu.in 180031947532846009506 180031947532846009506 No Electrical Engineering Department, Shiv Nadar University, India. M. D. Upadhayay madhur_deo@yahoo.com 180031947532846009507 180031947532846009507 Yes Electrical Engineering Department, Shiv Nadar University, India. S. Pal spal@bitmesra.ac.in 180031947532846009508 180031947532846009508 No Electronics and Communication Engineering, Birla Institute of Technology, Mesra, India.