Microwave Propagation in a Waveguide Containing Composite Structure of Semiconductor and Ferrite

In this communication propagation characteristics of a waveguide filled with a composite system of semiconductor and ferrite slab have been investigated. The dispersion relation for the propagation of electromagnetic waves along the interface between a low-loss ferrimagnetic material and a high mobility current carrying semiconductor is obtained. It is shown that the drift carrier stream in the semiconductor including diffusion and collision effects play an important role in the behaviour of space charge waves. There is an interaction between a wave in semiconductor having drift and diffusion effects and a wave in ferrite which gives rise to a growing wave with drifting carrier present in the semiconductor. It is suggested that solid state travelling wave anplifier can be adjacent to ferrite slab.