SLM Printed Wideband Circularly Polarized Multilayer Antenna Array with Reduced Impact by the Manufacturing Imperfection

A novel three-dimensional (3-D)-printed wideband circularly-polarized (CP) waveguide based 4 × slotted antenna array is proposed for wireless communications in the paper. For radiating CP waves, several additional eigenmodes are introduced by designing layers. By adjusting multiple resonances within cavity, axial ratio (AR) bandwidth can be enhanced, and impedance matching improved. Due to good AR performance of well-designed radiation subarray, scale easily extended a simple full-corporate-feed network. The multilayered fabricated using cost-effective commercial direct metal laser sintering (DMLS) technology. incorporating Huray model, this study considers simulates influence roughness. has measured 20.4% (18-22.1 GHz), which exactly same as its bandwidth. maximum gain 21.6 dBic achieved at 21.3 GHz. It validated that, compared with state-of-art technologies, wide pattern. developed shows competitive terms efficiency state-of-the-art antennas. This demonstrates viability employing advanced 3-D printing technique realizing complex microwave structures, holds high potential future communication applications.