Dielectric properties of mica at shf

The tangent of the loss angle and dielectric permeability are measured along the cleavage plane in natural phlogopite and muscovite in the frequency range 3–36.8 GHz. A maximum in the loss angle tangent in phlogopite was observed at a frequency of 5 GHz, connected with the presence of interpacket pellicular water.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 88–92, May, 1973.