ANALYSIS OF A PAIR OF DIELECTRIC COATED CYLINDERS ABOVE A DIELECTRIC SUBSTRATE

The paper presents a method of finding the distributed circuit paramet ers when two dielectric coated wires of different size are placed on a dielectric substrate above a ground plane. The bilinear transformatio n which transforms the conducting boundaries to a concentric circle is developed. These concentric circles are transformed to parallel plate s using logarithmic transformation. Using the combination of these two transformations, the dielectric boundaries in the transformed plane a re obtained in the form of a curved contour. The numerical results on capacitance per unit length, characteristic impedance and velocity of propagation are presented.