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Behavior of �(� and tan � for a class of low-loss materials

By: Riddle, B.; Janezic, M.D.; Baker-Jarvis, J.; Kim, S.;

2010 / IEEE / 978-1-4244-6797-6

Description

This item was taken from the IEEE Conference ' Behavior of �(� and tan � for a class of low-loss materials ' We report a study on the relaxation behavior of the real part of the permittivity. We also discuss the loss tangent of a class of materials in the microwave to millimeter band of frequencies. For relaxation response we show that the permittivity is a monotonic decreasing function of frequency. Also, for many low-loss ceramics, glasses, crystals, and solid polymers we found that the loss tangent increases nearly linearly with frequency. This linearity is explained in terms of the pulse-response function and the Sparks-King-Mills model. We show that the linearity may be used to extrapolate the loss tangent beyond the measurement band.