Receiver Antenna Model in Spice

Discussion in 'Wireless & RF Design' started by jdirga, Apr 15, 2009.

  1. jdirga

    Thread Starter New Member

    Apr 15, 2009
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    I need to include a receiver antenna in my SPICE simulation. Should I model it using a current source or voltage source? Does this depend on the type of antenna (whether it's a dipole, loop, etc) that I use? Please help. Thx.
     
  2. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    An antenna is best modeled as a voltage source with a fixed value of internal resistance (generally the radiation resistance of the antenna)

    Eric
     
  3. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    I might add that if you want to model the antenna over a wide range of frequencies, it should be modeled as a series RLC network fed by a voltage source. The Q of an antenna can be almost anything, but for a typical simple dipole, it might have a Q of around 12, and a radiation resistance of between 50-75 ohms.


    Eric
     
    Last edited: Apr 15, 2009
  4. jdirga

    Thread Starter New Member

    Apr 15, 2009
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    Hi Eric,

    Thanks for your reply. Could you give a reason why it should be modeled as a voltage source instead of a current source?

    My original thought was if it were a loop antenna, it should be modeled as a voltage source because the signal is generated on the received antenna thru Faraday's law of induction, i.e. emf=change of flux. However if it were a dipole, it should be modeled as a current source because signal is generated due to lenz's law?(I'm not confident with this).
     
  5. bestfpc

    New Member

    Apr 16, 2009
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    When design RF Antenna, you need to take care of material specification. Different material, different dielectric value. Such as for normally FR4 material, some factory use 3.8~4.2, some 4.8.

    Different value will affect the function. So when you design, you should base on a certain value and when going for prototype or samples, need to add a special notes about dielectric value so that things will be going as you designed. ^_^
     
  6. jdirga

    Thread Starter New Member

    Apr 15, 2009
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    Hi Bestfpc,
    I think your comment is irrelevant to my question.
     
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