Microwave cavity perturbation measurements of complex dielectric permittivity and complex magnetic permeability

Measurement of complex permittivity and permeability of dielectric and magnetic material plays an important role in microwave technology. Knowing properties of material is the first step in all kind of design when the material is used. This thesis has examined the rectangular cavity perturbation method as it used for material complex permittivity and complex permeability measurement. A wide range of material's permittivity and permeability have been successfully determined based on the rectangular cavity perturbation technique. Also, a modified rectangular cavity perturbation technique has been introduced and a new set of formulas have been derived in accommodating with a special measurement case namely when the material sample under measurement has insufficient sample length comparing to the height of cavity resonator. These newly derived formulas are more general than the standard forms and have been proved to be accurate in yielding consistent results by measuring different samples with different lengths.