Near-field Measurement and Far-field Characterization of a J-band Antenna Based on an Electro-optic Sensing

In this paper, we present a near-field pattern measurement based on an electro-optic sensing at 300 GHz band. The measurement system is based on a self-heterodyne technique and non-polarimetric frequency down-conversion technique. The far-field radiation pattern of a horn antenna calculated from the measured near-field pattern is compared with far-field pattern measured with a conventional measurement system using open-ended waveguide probe.