Frequency and temperature dependence of dielectric constant ( ) and di el ectric loss ( ) i n pure epoxy resin and polymer composites with glass fiber are studied in the frequency range 40Hz-110 MHz and in the temperature range (25-150) 0 C.The experimental results show that and increased with the addition of glass fiber in epoxy resin. The value of ( ) decreased with increasing frequency which indicates that the major contribution to the polarization comes from orientation polarization

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... ric loss peaks were also observed in the composite materials at high temperature due to Tg of epoxy .The value of ( ) increased with increasing temperature, and is due to greater freedom of movement of the dipole molecular chains within the epoxy at high temperature.