+ Post New Thread
Results 1 to 3 of 3
  1. #1
    Newbie level 6
    Points: 1,673, Level: 9
    Achievements:
    7 years registered

    Join Date
    Oct 2009
    Location
    AT
    Posts
    11
    Helped
    0 / 0
    Points
    1,673
    Level
    9

    Measuring electrical field and magnetic field of an antenna with digital magnetometer

    Hi,
    Is it possible to measure magnetic field (and/or electrical field) of electromagnetic radiation of an antenna? For example in the vicinity of Bluetooth antenna (2.4GHz).
    Can we measure it with digital magnetometer like LIS3MDL from ST?

    •   AltAdvertisment

        
       

  2. #2
    Advanced Member level 5
    Points: 33,233, Level: 44

    Join Date
    Oct 2001
    Posts
    4,751
    Helped
    1403 / 1403
    Points
    33,233
    Level
    44

    Re: Measuring electrical field and magnetic field of an antenna with digital magnetom

    Theoretically any EM (electromagnetic) field would have an electric-E field and a magnetic-M field, that can be measured somehow.
    Magnetic field have the highest magnitude in the reactive near-field of the antenna (in the proximity of the antenna).
    Generally the magnetic filed of a dipole, or a monopole, or a patch antenna is low. Those antennas have good far-field EM radiation.
    The greatest magnetic field is provided by loop antennas, which usually are not used in Bluetooth communication, due to their poor far-field radiation.



    •   AltAdvertisment

        
       

  3. #3
    Super Moderator
    Points: 249,762, Level: 100
    Awards:
    1st Helpful Member

    Join Date
    Jan 2008
    Location
    Bochum, Germany
    Posts
    43,481
    Helped
    13214 / 13214
    Points
    249,762
    Level
    100

    Re: Measuring electrical field and magnetic field of an antenna with digital magnetom

    You surely can't measure GHz magnetic field with a kHz bandwidth sensor. If at all, you can measure it with a sense coil small compared to the wavelength.

    Similar sense coils are e.g. used in EMC measurements to localize unwanted radiated magnetic fields.



--[[ ]]--