Analysis of broad side coupled inhomogeneous cylindrical striplines

A method of analysis for inhomogeneous broad side coupled cylindrical striplines is described. It is found that unequal phase velocities for even and odd modes can be obtained with these lines, thus making them advantageous for the design of cylindrical stripline directional couplers.The data for even and odd mode impedances, effective dielectric constants and mode phase-velocity ratios are presented. The effect of environmental changes on an otherwise planar structure is studied by extending the present analysis to cylindrically warped broad side coupled striplines.