A simplified, approximate means for computing the distributed capacitance and inductance matrices for TEM-mode (or quasi-TEM-mode) single or multiple transmission lines is presented. Cases with multiple dielectrics and/or ground planes are included. The conductors used may be either rectangular or planar. Simplicity is achieved by use of the method of moments along with two physically meaningful charge basis functions per conductor face. The techniques utilized are relatively easy to program and result in fast programs which are accurate for many important geometries. Such programs should be suitable for inclusion as subroutines in larger CAD programs for analysis and design of high-speed digital or microwave circuits.
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