Computer-Aided Design of an Integrated-Photonic Butler Matrix for a True-Time Delay Millimeter-Wave Antenna Feeder Network

The principles to optimize millimeter-wave antenna feeder network design for a 5G fronthaul radio unit are discussed based on the study of photonics scheme including integrated
$8 \times 8$
optical Butler matrix using VPI Photonics Design Suite and MATLAB software tools. In the result of experiments, an outcome that both the integrated optical Butler matrix itself and the BFN based on it possess an acceptable quality of beams formation in a particular 5G pico-cell with distribution in millimeter-wave band, is obtained.