Influence of loss in substrate on dispersion of electromagnetic waves in active semiconductor transmission lines

By means of an electrodynamical analysis we reveal the influence of the finite conductivity of the n⁺ substrate on the dispersion of electromagnetic waves in an active strip transmission line (ASTL) based on the distributed thin film semiconductor structure metal-n-n⁺. We demonstrate a reduction of the linear amplification and the reduction of the band of amplified frequencies of the ASTL as a result of losses in the n⁺ layer in the centimeter and millimeter ranges.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 58–61, April, 1986.