Abstract: Facing with the demand for Tera Hertz(THz) antenna pattern calibration,analyzes and evaluates the measurement uncertainty of planar near field measurement based on the measurement device of THz antenna pattern and the classic planar near field measurement uncertainty analysis model of NIST.And the measurement uncertainty is verified through comparative method.The experimental results indicate that the evaluation method is feasible in the set frequency band and is expected to remain applicable in higher bands.This paper introduces a THz antenna pattern measurement device based on planar near field first,then analyzes the sources of measurement uncertainty one by one,compares and verifies results through far field measurement.And then looks forwards to the future work.

Key words: Planar, Near field, Tera Hertz(THz), Antenna, Uncertainty