I have recently carried out some radiation pattern measurements in a Satimo anechoic chamber. Since my antenna system has tunable elements (diodes), I am worried about the non-linear effect of these elements in the gain measurement because the measured gain is lower than what I predicted. In my electromagnetic analysis, the serial resistance of the tunable element is taking into account but not the non-linear effect.
Do you know what is the output power (the power that feed the antenna under test) that is usually used in that type of anechoic chamber? I asked the technician who monitor the anechoic chamber where I made my tests but he does not have the answer.
Thank you.
Dear Halim Boutaieb,
I do not know specifcally that anecoic chamber, but the output power depend on the instruments attendant the chamber and it is certainly adjustable. Therefore, you can make a measurement to veryfy the overall linearity of the whole system. For example, you can make a measure of the radiation pattern on a known antenna. You could make a measurement of the field by using a calibrated electromagnetic sensor. In this way you can know the range of linearity of the whole system. After, you can use the system without worry of the linearity.
Dear Sir,
what is the Input power ? , the Absorption room area and the Antenna gain ?
With this answer I can give you a answer for Output power.
All the best
F. Gräbner
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