Microstrip antenna design for arrays generating OAM mm-wave radio signals

Abstract

The paper is devoted to development of the single antenna as an element of the array, intended for radiating electromagnetic fields with different orders of the orbital angular momentum (OAM) in the band 77 ÷ 78.5 GHz. Multiplexing on OAM provides more opportunities for safe data transmission and increases the quantity of the simultaneously transmitted channels. The antenna design takes into account the special requirements for its structure, imposed by its practical usage in array. The modeling process includes calculating the dimensions, selecting the suitable materials (Rogers RO 3003) and components, simulating with the software and analyzing the following characteristics: VSWR, return loss S11, input impedance, and radiation pattern. The designed antenna represents a half-wave dipole, fed by coplanar waveguide port and matched to 50 Ohm impedance. Its VSWR is less than 1.8, radiation pattern is quite wide. Its configuration and size provide easy combination of such elements in array, including the question of the feeding lines simplicity. The recommendations on the following research steps are given. The application areas are described.