Wideband High-Gain Circularly Polarized Antenna Array on Gap Waveguide for 5G applications

Paper in proceeding, 2019

A wideband circularly polarized (CP) antenna array based on gap waveguide (GW) is presented in this paper. Firstly, a CP antenna based on septum polarizer is designed as the element for the array. Secondly, the feeding network is composed of T-junctions and realized by ridge gap waveguide (RGW). Then a 16 × 16 antenna array is built up by the elements. The novelty of this antenna is the combination of planar array and septum polarizer based on GW technology to achieve circularly polarization, high gain and high efficiency in wide bandwidth. The proposed array antenna achieves wide impedance bandwidth of 34.5% with the reflection coefficient below -10 dB, and a wide 3-dB axial ratio (AR) bandwidth of 26.5%. The simulated gain is higher than 32 dBic from 24.5 to 32.0 GHz, and the antenna efficiency is larger than 90%.