Near field antenna design

Discussion in 'Wireless & RF Design' started by Nano001, Jun 25, 2015.

  1. Nano001

    Thread Starter Active Member

    Jan 12, 2010
    88
    0
    Hi everyone, I have an OOK signal with a carrier frequency of 20 MHz and I am looking to design an interfacing transmitter antenna. Given that the wavelength is 15 meters, a 1/4 wavelength antenna would be much too large for my application. I am wondering if a near field antenna, similar to what is used for RFID, would give me a couple meters read range at this frequency, given the antenna was driven with enough power and designed correctly. A design methodology similar to the below pdf is what I am thinking, but for 20 Mhz.

    http://www.st.com/st-web-ui/static/...ical/document/application_note/CD00221490.pdf
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    Do you have enough information to design the antenna or are you looking for a knowledgeable person to do it for you?
     
  3. DickCappels

    Moderator

    Aug 21, 2008
    2,647
    632
    It would if you make the antenna large enough and have a suitable transmitter and receiver.

    20 MHz might not be the best frequency to use. In the United States, that frequency is used for standard time and frequency transmission. 13.56 MHz ± 7 kHz is reserved for Industrial, Scientific, and Medical use in most of the world and would using that frequency would lessen your chances of interfering with another service.
     
  4. Nano001

    Thread Starter Active Member

    Jan 12, 2010
    88
    0
    Ok thanks for the replies. I have some experience to carry this out but of course input from the experts would be a great help. I am aware of the 13.56 MHz band but I am not sure how much control I will have over the frequency. Knowing that it can be done is a good start for me.
     
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