What does it mean to calibrate an antenna

Discussion in 'Homework Help' started by Ali Alkhudri, Nov 26, 2015.

  1. Ali Alkhudri

    Thread Starter New Member

    Nov 3, 2015
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    1
    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
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    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.
     
  3. ian field

    Distinguished Member

    Oct 27, 2012
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    Just throwing a wild guess - it may have something to do with SWR.
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,175
    1,798
    SWR is irrelevant for a receiving antenna where you are interested in converting volts/meter into volts into a 50Ω load.
     
  5. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    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.
     
  6. ian field

    Distinguished Member

    Oct 27, 2012
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    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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