Standing Wave Ratio (SWR) and Reflection Coefficient question

[akyip]

Hey all,

I have a quick clarification question about the standing wave ratio (SWR) and reflection coefficient formulas used for transmission lines.

For standing wave ratio (SWR), the formula is:

Standing Wave Ratio: SWR = V max / V min, or SWR = I max / I min

Are the voltage and current values in the SWR formula supposed to be actual phasors, or magnitudes only?

Likewise, the formulas for the reflection coefficient are:

Reflection Coefficient = V reflected / V incident

Reflection Coefficient = I reflected / I incident

Reflection Coefficient = (Z L - Z o) / (Z L + Z o)

Where Z L = load impedance and Z o = characteristic/surge/natural impedance

In these reflection coefficient formulas, are the voltage, current, and impedance values supposed to be actual phasors, or magnitudes only?

Thanks for any clarification on this!