STUDY OF LOSS EFFECT OF TRANSMISSION LINES AND VALIDITY OF A SPICE MODEL IN ELECTROMAGNETIC TOPOLOGY

This paper studies the loss effect of the line and the validity of a SPICE model for lossless transmission lines excited by an incident plane wave by using a simple structure — a single line over an infinite perfectly conducting ground excited by an incident electromagnetic field. The frequency domain current responses calculated by the Baum-Liu-Tesche (BLT) equation with the loss ignored are compared with those through the BLT equation with loss considered to study the loss effect of transmission lines. The loss effect study shows that the SPICE model for lossless transmission line can be used for nuclear electromagnetic pulse, ultra wideband, and the low-frequency range of high power microwave interaction with most systems. But for a sine or cosine wave of which the frequency equals the pole frequency of the line, the SPICE model may lead to significant error.

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