Asynchronous visualization of an FMCW electric field at 76.5 GHz using integrated multichannel electro-optic probe

We demonstrate the visualization of an amplitude and phase distribution of a frequency-modulated continuous wave (FMCW) radar signal (318 MHz bandwidth) at 76.5 GHz. The system is based on an asynchronous technique using an integrated multichannel electro-optic probe in which neither a reference probe nor a cable plugged to the RF source is required. Near field of the FMCW electric field emitted from a horn antenna was measured and radiation pattern was characterized.