Abstract    In the present paper, the problem of externally excited exponential transmission line hasbeen solved analytically in frequency domain using a simple approach. Then steplines approximationas a first order approximation for the problem of externally excited nonuniform transmission lines ingeneral and exponentially tapered transmission line (ETL) as a special case has been presented.Finally the two approaches are compared and some useful results are obtained to show when the twomethods are equivalent.

Keywords    Nonuniform, Multiconductor Transmission Lines, Simulation, Coupling

References      1. Taylor, C. D., Satterwhite, R. S. and Harrison, C. W. Jr., "The Response of a Terminated Two-Wire Transmission Line Excited by Nonuniform Electromagnetic Field",IEEE Trans. Antennas Propagate., Vol. AF-13, Nov. (1965), 987-989. 2. Agrawal, A. K., Price, H. J. and Gurbaxani, S. H., "Transient Response of Multiconductor Transmission Lines Excited by a Nonuniform Electromagnetic Field", IEEE Trans. Electromagnetic Compatibility, Vol. EMC- 22, No. 2, May (1980), 119-129. 3. Omid, M., Kami, Y. and Hayakawa, M., "Field Coupling to Nonuniform and Uniform Transmission Lines",IEEE Trans. Electromagnetic Compatibility, Vol. EMC-39, No. 3, May (1997), 201-211. 4. Younan, N. H., "An Exponentially Tapered Transmission Line Antenna", IEEE Transactions Electromagnetic Compatibility, Vol. 6, No. 2, (May 1994), 141-144. 5. Kamachandran, V. and Nair, K. K., "Equivalent Circuits of an Exponential Transmission Line", IEEE Transactions Circuit Theory, Vol. CT-7, No. 1, (March 1960), 71-74.