Field-Calibrated Electrooptic Probing System for Millimeter-Wave 5G Applications

We propose field-calibrated electrooptic probes that are designed for millimeter-wave (mm-wave) 5G phased array antenna and Ka-band rectangular waveguide. A method to enhance the probes’ sensitivity and the practical limit for realization are presented. The fabricated probes are specifically minute enough to fit inside a standard mm-wave waveguide section for calibration in a minimally invasive way. The proposed calibration method is validated by analyzing the field invasiveness and through a simulation. Using a calibrated probe associated with a heterodyning probe control system, electric field distributions with absolute V/m scale from an mm-wave antenna are presented.