ELECTROMAGNETIC ANALYSIS OF A 2-WIRE TRANSMISSION-LINE OF PARALLEL CYLINDERS OF UNEQUAL RADII WITH DIELECTRIC COATING

The paper presents a method for the evaluation of capacitance, charact eristic impedance and velocity of propagation of a dielectric-coated t wo-wire transmission line of parallel cylinders of unequal radii under TEM mode approximation. A conformal transformation is used to transfo rm the conductor and dielectric boundaries to appropriate contours ext ending over a fixed region along the imaginary axis in the transformed plane. Approximating the continuous curve obtained through transforma tion of dielectric boundaries by a very large number of discrete steps , the expression for the capacitance is derived in the form of a defin ite integral. Numerical data on capacitance, characteristic impedance, velocity of propagation in the absence and presence of a perfectly co nducting ground plane are presented.