Sub-millimetre-wave propagation measurement techniques

number of propagation measurements have been made in the sub-millimetre (s-mm) wave region (about 1 mm to 10 um wavelengths or frequencies of 300 GHz to 3 THz) using four basic techniques. While those measurements have been reported in the literature, s-mm propagation measurement survey papers to date have concentrated on the reported propagation data. This paper describes measurement techniques used in 33 s-mm propagation measurement papers and discusses various aspects of their techniques including characteristics of the apparatus employed. Factors to be considered in using those techniques are discussed. Certain propagation measurements which are needed for the s-mm region are cited.