Application of the Transmission-Line Super Theory to Multiwire TEM-Waveguide Structures

Open TEM-waveguides are often realized by multiwire structures instead of conducting planes. Especially for large-scale nuclear electromagnetic pulse (NEMP) simulators the wire structure is common. In this paper, a generic open TEM-waveguide structure is analyzed using the transmission-line super theory (TLST). The concept of the numerical implementation is thoroughly described independent of a particular programming language. The TLST comprises full Maxwell's equations assuring that higher order modes and radiation effects are included. Currents along the lines and the total radiated power outside the simulator are calculated. Inside the simulator the magnetic field is estimated in the working volume, and the result is verified by experiment. The presented theory is applicable not only to the described simulator structure but also to a variety of wire-based problems in electromagnetic compatibility.