Difference between measuring radiated power and S11

kae_jolie said:

volker,
As vfone pointed out above, S21 when using a reference antenna in real measurement, should be proportional to radiated power.

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Yes, but you have to integrate over all directions (complete sphere) to get the total radiated power.

---------- Post added at 22:17 ---------- Previous post was at 22:14 ----------

E Kafeman said:

Search for SAM phantom head and HSL-900 & HSL1800 for recipe and pictures. It do also exists standard hands, torso or full body.

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Here is an example:
SPEAG offers phantoms, probes and automated test systems as well as software.
**broken link removed**

As vfone pointed out above, S21 when using a reference antenna in real measurement, should be proportional to radiated power.

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The special problem is, that the adjacent objects are also changing the antenna's directional characteristic. So it may be misleading to assume S21 measured in a particular axis as representative value for the total radiated power.

Thanks to E Kafeman for detailed explanation of SAR measurement methods.