Is this Antenna Isotropic?

Discussion in 'General Electronics Chat' started by EngIntoHW, Oct 30, 2012.

  1. EngIntoHW

    Thread Starter Member

    Apr 24, 2010
    128
    0
    Hi,
    Is the following antenna isotropic, i.e. receives signals in all directions?
    DMM-7-27

    It is said here in the Operating Frequency Table 'isotropic gain', but in the datasheet it doesn't say that the antenna is isotropic.
    [​IMG]

    Thank you very much
     
    Last edited by a moderator: Oct 30, 2012
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    It is not an isotropic antenna.
    An isotopic antenna does not have any gain in any direction.
    http://en.wikipedia.org/wiki/Isotropic_antenna

    There is given a gain of 2.5 - 4 dBi (2.5 - 4 dB in relation to the isotopic radiator).
    dBi: = Gain of antenna with respect to isotropic antenna given in dB = 10 log (power max / power isotropic)

    Bertus
     
  3. EngIntoHW

    Thread Starter Member

    Apr 24, 2010
    128
    0
    Hi bertus, thank you.
    Could you tell the directions the antenna is pointed to?
    It is said there that the antenna's radiation pattern is omni directional, doesn't it mean that it radiates equally in all directions?

    If there's antenna with say 8 dBi, does it mean that its reception direction is more narrow than the one with 2dBi?
     
    Last edited: Oct 30, 2012
  4. K7GUH

    Member

    Jan 28, 2011
    191
    23
    Omnidirectional does mean that it radiates in all directions in a single plane. (If you can see the antenna, it is not an isotrope.) You can verify the omnidirectional attribute yourself with a signal strength meter and some means to rotate the antenna in the horizontal plane.
     
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