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high reflection coefficient and phase shift

Discussion in 'Electronic Basics' started by tsp, Feb 21, 2004.

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  1. tsp

    tsp Guest


    Can somebody explain, how a high reflection coefficient is related to
    phase shift? Some of the book I have been reading on LNAs say that
    as long as we have a high reflection coefficient we can phase shift
    and transform a 50 ohm impedance to short circuit. How does this
    happen? How would it work if I was to look at a Smith Chart?

  2. Gareth

    Gareth Guest

    A high reflection coefficient means a point near the edge of the Smith
    chart, a phase shift can move that point round the edge of the chart, so
    you can get to a short circuit (or open circuit if you wanted) with the
    appropriate phase shift.

    Another way of looking at it is that you choose a phase shift such that
    the reflected wave arrives 180 degrees out of phase with the original
    wave, so the voltage cancels and you get zero volts as you would with a
    genuine short circuit.


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