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CST MWS: Antenna Calculation difference in E-farfield pattern values

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quintenvdb

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Hi everyone,

I am currently developing software in MATLAB to calculate the S21 parameter based on the E-farfield pattern simulated in CST.
However, MATLAB doesn't calculate the correct S21 values from these farfield patterns.

I read something about Antenna Calculation in the CST design studio handbook (p.93). When applying this AC task (with voltage excitation source of Mag = 1 and Phase = 0) to the already generated farfield patterns, a new farfield is generated [ACx] for each frequency. These farfield pattern values are however much lower than the original ones.

My question is: Why are these values lower? What is the physical interpretation of this AC task?
They don't really explain this in the handbook or online.

Kind regards
Quinten
 

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