What does it mean to calibrate an antenna

Thread Starter

Ali Alkhudri

Joined Nov 3, 2015
19
Hi

I found this citat in my book Williams, "EMC for product designers" : The antenna must be calibrated in terms of volts output into 50 ohm for a given field strength at each frequency ...

what does this mean ?
thanks
 

Papabravo

Joined Feb 24, 2006
12,695
For most applications of an antenna, calibration is not required. When used as part of a measurement system you need to know how Electric Field Strength and Magnetic Field Strength induce voltages and currents in an antenna and whatever load is connected to the antenna.
 

ian field

Joined Oct 27, 2012
6,539
For most applications of an antenna, calibration is not required. When used as part of a measurement system you need to know how Electric Field Strength and Magnetic Field Strength induce voltages and currents in an antenna and whatever load is connected to the antenna.
Just throwing a wild guess - it may have something to do with SWR.
 

JoeJester

Joined Apr 26, 2005
4,126
You need a calibrated system, antenna included, when making field strength measurements.

Amps per meter and volts per meter are typically the requisite measurements concerning SAR.
 

ian field

Joined Oct 27, 2012
6,539
SWR is irrelevant for a receiving antenna where you are interested in converting volts/meter into volts into a 50Ω load.
SWR is relevant on receive if you're after very weak signals.

On transmit; bad SWR can blow your PA transistor - its effects on receive are less dramatic, but it still has a bearing on how much signal gets down the feed line.
 
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