Characterization of microwave absorbing materials using a wideband T/R measurement technique

Results of an investigation on various microwave absorbing materials developed at the Telecommunications Research Institute (PIT) are presented. The materials, composed of proprietary powders mixed with either classical liquid or modernized dry material bonder, were characterized with a wideband T/R method using 7-mm in-house made coaxial airline holders utilized also for the multiline TRL calibration of a vector network analyzer. Effects of different technology applied were verified by comparing the complex permittivity and permeability characteristics of the absorbers.