“…The use of the reflection coeflacient allows the dielectric measurement of buried material and possibly the reconstruction of the geometry of buried objects such as archaeological artifacts, pipes, conduit, or land mines [77][78][79][80][81][82][83] 30 GHz. In these methods the TEM mode transmission and reflection coefficients are measured using algorithms similar to those used in closed transmission lines to obtain the material properties [84][85][86][87]. The calibration method used is generally a variation of through-reflect-line (TRL).…”