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: <math>\frac{\partial^2H_z}{\partial{x}^2}+\frac{\partial^2{H_z}}{\partial{y}^2} = \mu\varepsilon\frac{\partial^2{H_z}}{\partial{t}^2}</math>
The figure on the right presents a structure, referred to as a ''series node''. It describes a block of space dimensions <math>\Delta x</math>, <math>\Delta y</math> and <math>\Delta z</math> and consists of four ports. <math>L'</math> and <math>C'</math> are the distributed inductance and capacitance of the transmission lines. It is possible to show that a series node is equivalent to a TE-wave, more precisely the mesh current ''I'', the ''x''-direction voltages (ports 1 and 3) and the ''y''-direction voltages (ports 2 and 4) may be related to the field components <math>H_z</math>, <math>E_x</math> and <math>
: <math>-V_1+V_2+V_3-V_4 = 2L'\Delta l\frac{\partial{I}}{\partial{t}}</math>
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