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A frequency-domain techique based on the measurement of scattering parameters has been described for the simultaneous measurement of complex permittivity Â¿* and permeability Â¿* in the millimeter region. The technique can be easily adapted for broad-band measurements. Results are given for teflon, plexiglas, fiberglass, and FGM-40, a magnetic absorber in the X band. Reflection and transmission error parameters corrections can be implemented to improve the accuracy.