An Exponential Transmission Line Employing Straight Conductors

An exponential transmission line is useful for impedance transformations over a wide band of radio frequencies. It is shown that a four-wire line of the "side-connected" type employing uniform conductors, and in which the rates of taper change only once along the line, may be designed to approximate closely to an exponential line. Design equations and charts are given which aid in determining the wire sizes, values of taper, and change in taper for building some of these transformers.