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The frequency-domain transmission-line equations for parallel planar transmission lines are derived in this paper. Such a general formula is very useful in order to analyze the characteristics of arbitrary transmission lines. And the hypothesis, i.e., the existence of non-zero diagonal parameters in the parameter matrix, made by Haase and Mei is validated through a sound theoretic derivation. The non-zero parameter takes into account the effects of discontinuity, radiation and higher modes of the lines.
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Wang et al. (2005) studied this question.
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