How to caculate wavelength of a pulse wave?

Discussion in 'General Electronics Chat' started by eefocus, Sep 11, 2012.

  1. eefocus

    Thread Starter New Member

    Sep 6, 2012
    I am designing a ultrawide band transmitter which emits short pulses.To decide how long for a trace can be counted as transmission line,I need to know the wavelength of the pulses.
    These are periodic Gaussian pulses of period 100ns.Pulse duration is 1ns.Two possible thoughts are:
    1 Since the Fourier Transform of a single pulse have a central frequency of 4GHz and bandwidth of 2GHz,wavelength is light speed in medal(copper)/4Ghz.
    2 Since wavelength is the distance of pulse travels in one period,it will be pulse duration*light speed in medal.
    Obviously these two are different.
    Please help me.

    Thanks a lot!
  2. crutschow


    Mar 14, 2008
    If you want to preserve the shape of the pulse, you use the highest frequency, which is determined by the pulse duration.