Electromagnetic wave question

Discussion in 'Wireless & RF Design' started by braindead, May 12, 2010.

  1. braindead

    Thread Starter New Member

    May 12, 2010
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    To be honest, I wouldn't really know how to tri-state an electromagnetic wave. Perhaps one of the experts can help with that?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    It's more appropriate to start a thread with a new question, rather than hijacking an existing one - http://forum.allaboutcircuits.com/showthread.php?t=36797

    If you are referring to an electromagnetic wave propagating in free space, I do not believe that you can affect it. Perhaps you could elaborate on the meaning of
     
  3. braindead

    Thread Starter New Member

    May 12, 2010
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    Hi beenthere, The comment was related to someone wanting to use the I2C protocol for satellite communications. I was wondering if there is a way to tristate the electromagnetic wave in an easy way. I guess it is possible just using two states actually, but how would you clock extend! I just dont see it happening over air, but perhaps someone can construct something clever that looks like I2C over air.

    I realize the discussion is silly :)
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    I split this off, as it sounded like an unrelated question.

    As far as the I2C protocol goes, it is not useful for radio transmission - those electromagnetic waves. The internal logic in an individual satellite might use the protocol in the microprocessor controlling various transmitters and receivers and so on, but that would be about it.
     
  5. braindead

    Thread Starter New Member

    May 12, 2010
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    I realize that too, beenthere. I have worked with I2C for a while. But there was still something interesting there, what is the closest to I2C you could do over air. What would the equivalent of the tristating be, how would clock extension look like, etc. :) I never worked with air as a medium, but I guess someone could make something I2C@Air :D
     
  6. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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    Not really.:)

    Using waveguides it's possible to make I2C (like) switching of EM waves.

    http://www.microwaveresourcesinc.com/SPSTSwitches.htm
    http://www.microsemi.com/brochures/pindiodes/chapter%206.pdf

    http://ece.ut.ac.ir/MicrowaveLab/LabReports/PIN.pdf
     
    Last edited: May 13, 2010
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