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Source for RF "pass-through"?

Discussion in 'Electronic Components' started by DaveC, May 20, 2004.

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  1. DaveC

    DaveC Guest

    Not sure of the proper name, but I'm looking for a connector that provides
    connection through a bulkhead, from one PBC to another PCB. Not a "connector"
    in the traditional sense. Both sides of it look like the back end of a
    solder-type connector; just someplace to solder a wire.

    I've searched Digi-Key, Mouser, and a few others, but can't find anything
    like this. I've seen them in hi-f comm equipment.

    I need one for 2.4 GHz.

    Where can I find one?

    Thanks,
     
  2. Well there are FeedThru capacitors, and there are Feedthrus without
    capacitance, or should I say, minimal capacitance, maybe a few pF.
     
  3. DaveC

    DaveC Guest

    W/O is my preference.

    Sources?
     
  4. How are you planning to deal with the impedance discontinuity at the
    hole? If I was making one or two or these, I would pass teflon coax
    through the hole with a band of the outer insulation removed, and
    solder the braid to the wall.
     
  5. maxfoo

    maxfoo Guest

    Copper tape?






    Remove "HeadFromButt", before replying by email.
     
  6. Dave VanHorn

    Dave VanHorn Guest


    I think what you're looking for is a bulkhead connector. Meant to pass RF
    through a metal wall.

    The others are thinking feedthrough capacitor, I think, which is a way to
    feed DC or low freq signals through the metal wall, but not RF.
     
  7. DaveC

    DaveC Guest

    Yes, that describes what I intend to do.

    Source?
     
  8. DaveC

    DaveC Guest

    Let me ask for an expansion on that for a non-professional
    hobbiest-experimenter's point of view: the capacitance of the metal as the
    coax passes through will change the impedance of the coax?
     
  9. As I understand it, you want to pass a 2.4 GHz signal through a metal
    wall.

    If you pass a wire through a hole in a metal wall, there is an abrupt
    change in the impedance of that wire for high frequency waves
    traveling along the wire that will cause a big reflection at the
    hole. Only a fraction of the energy will pass through. If you pass a
    coax through the hole, without breaking the outer braid, the wave is
    not affected by the hole, even if the braid makes contact with the
    wall.

    Am I understanding what you are trying to do?
     
  10. maxfoo

    maxfoo Guest


    www.johnsoncomponents.com







    Remove "HeadFromButt", before replying by email.
     
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