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Heaviside condition
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==The condition== [[File:Line model Heaviside.svg|right|thumb|upright=2|Heaviside's model of a transmission line.]] A transmission line can be represented as a [[distributed-element model]] of its [[primary line constants]] as shown in the figure. The primary constants are the electrical properties of the cable per unit length and are: [[capacitance]] ''C'' (in [[farad]]s per meter), [[inductance]] ''L'' (in [[Henry (unit)|henries]] per meter), series [[Electrical resistance|resistance]] ''R'' (in [[Ohm (unit)|ohms]] per meter), and shunt [[Electrical conductance|conductance]] ''G'' (in [[Siemens (unit)|siemens]] per meter). The Heaviside condition is satisfied when :<math>\frac{G}{C} = \frac{R}{L}.</math> The series resistance and shunt conductivity cause losses in the line; for an ideal transmission line, <math style="vertical-align:0%;">\scriptstyle R=G=0</math>. An ideal line trivially meets the Heaviside condition.
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