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microstrip gap capacitors

Discussion in 'Electronic Design' started by Philip Newman, Nov 19, 2003.

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  1. I am implementing a dog bone filter structure in microstrip. this includes
    coupling capacitors which have to be realised on-chip. I have decided to
    use gap capacitors, which is just a gap between microstrip lines. my
    question is this. I have the capacitance value, how can I calculate the gap
    space, S, and the width of the microstrip line, W?

    Any ideas would be greatly appreciated.

  2. Don Pearce

    Don Pearce Guest

    The situation is far more complex than this. The capacitance actually
    resolves into a pair of caps to ground, and a series cap. There is no
    closed-form equation to calculate these, but I suggest you get hold of
    a copy of "Foundations of microstrip circuit design" by T. C. Edwards
    and have a read of the series gap pages.


  3. bugger.

    I know what you mean, I have seen the circuit topology. Terry Edwards book
    is very good, and hopefully explain it!


  4. Philip,

    Try looking on the Eagleware web site, in their forum section I seem to
    remember an article by Randy on this subject

    Patrick B
  5. not registered with them, but I think we have the problem sorted.

    thanks anyway

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