A Transmission Line Modeling Program Written in C

LINEMOD is a transmission line modeling program that takes a line configuration (including possibly bridged taps) and generates the input impedance, attenuation versus frequency, and impulse response. It is written in C, a modern structured programming language, and utilizes sophisticated data structures, dynamic storage allocation, and recursion to achieve flexibility and economy of storage. As such, it illustrates the value of C as an implementation language for modeling programs of this type. It also emphasizes a shortcoming of C for this purpose, which is the absence of built-in complex arithmetic.