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The Exponential Radio-Frequency Transmission LineThe spacing of the wires of the transmission lines previously considered has been the same at all points, and hence the inductance and capacitance of each unit length is the same. An exponential transmission line16,17,18 is one in which the inductance and the capacitance vary exponentially with distance along the line. Such a variation in these line constants can be achieved by varying the spacing exponentially, by varying the wire size, or by these two methods in combination. It has been found18,19,20 that the exponential line has impedance-matching properties. In this respect the exponential line is similar to the non-symmetrical network which must be terminated in image impedances that are unequal (page 153). Also, the exponential line has a cutoff frequency. In these respects it differs from the uniform line. The exponential line is used at radio frequencies for impedance-matching purposes (page 495). See also page 498.
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Last Update: 2011-05-30