CST – Computer Simulation Technology

Antenna Efficiency Tool

1 Reflection, conduction and dielectric losses.

The total antenna efficiency takes into account losses at the input terminals and within the structure of the antenna. The losses may be due, referring to the figure below, to:

Reflections due to the mismatch between the transmission pne and the antenna

I2R losses (conduction and dielectric)

This tool calculates the total antenna efficiency using the following equation:

e0= er ecd


e0 = total antenna efficiency

er = reflection (mismatch) efficiency = (1 - |Τ|2)

ecd = antenna radiation efficiency

Τ = voltage reflection coefficient at the input terminals of the antenna [Τ=(Zin- Z0)/( Zin- Z0) where

Zin = antenna input impedance, Z0 = characteristic impedance of the transmission pne].

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