The use of electromagnetic fields for testing of composites takes a variety of forms but most methods use high frequency techniques because of the properties of composites. Scattering and propagation in composites are good indicators of a variety of material properties, especially in low conductivity composites. Eddy currents at high frequencies can also be used for conducting composites. Some of the methods applicable to modeling of testing phenomena at high frequencies are reviewed here. Examples from testing of composites and dielectrics in microwave cavities and scattering from lossy dielectrics are given.
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