Discussion
Why are handset antennas tested with standardised phantoms?
Answer: A
Because a hand and head change the impedance, the pattern and the efficiency by amounts that dominate the design, a measurement in free space says little about performance in use. Standard liquid filled phantoms make results comparable between laboratories. Mechanical fixturing and chamber reflections are handled separately, and the requirement is for representative loading rather than for a model of a user as such. Measuring a device in conditions resembling its use is a principle that extends well beyond antennas.
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