Absorption and dispersion of low-loss dielectrics measured with microwave transient radiation

The dielectric constant and loss coefficient of alumina ceramic, polyimide, and Teflon, measured from 10 to 130 GHz using coherent microwave transient spectroscopy, are presented. It is shown that this new technique can yield valuable information about the dielectric properties of materials with continuous frequency coverage in a spectral region of technological importance and where few data are so far available.