CHARACTERISTIC IMPEDANCE OF A RECTANGULAR COAXIAL CONE TRANSMISSION-LINE WITH AN OFFSET INNER CONDUCTOR

After the electromagnetic fields in a line are discussed, conformal ma pping and the singular integral-equation technique are used to derive the expression Sol the characteristic impedance of a rectangular coaxi al cone transmission line with an offset inner conductor (RCCTLO). Sim ple and very accurate formulas, based on only the spherical TEM mode p ropagating, for the capacitance and characteristic impedance are found in terms of complete elliptic integrals. The method enables the chara cteristic impedance of a GTEM cell to be evaluated accurately and easi ly. (C) 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 19: 26 7-271, 1998.