Analysis of mode conversion phenomena in a non-uniform parallel plate wave guide (Summary)

A coupled mode analysis of a parallel plate wave guide with non-uniform impedance boundaries is presented. Closed form solutions for the first order estimates of the modal amplitude coefficients are obtained assuming small variations. An analytical comparison with an exact mode-matching solution in the case of a stepwise change of the lower wall impedance is given and verified numerically. As an extension of the method, a wave guide with perfectly conducting but rough walls is analyzed. The possibility of selective mode coupling is pointed out. Full article is available on microfiche. Order from American Geophysical Union, 2000 Florida Avenue, N.W., Washington, D. C. 20009. Document S81-002; $1.00. Payment must accompany order.