HELP PLEASE!!! Propagation of electromagnetic waves

Discussion in 'Homework Help' started by Alfa_ET, Mar 22, 2011.

  1. Alfa_ET

    Thread Starter New Member

    Feb 26, 2011
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    0
    Question: designing an inverter transformer for adapting a load ZL = 75ohms to a transmission line of characteristic impedance of 300ohms, and reduced losses, at a frequency of 300MHz.

    Answer: length = 0.25m transformer impedance characteristic= 150ohms

    Question: Determine the bandwidth of frequencies where the VSWR on the line is less than 1.5.

    Answer: I need help. Analytical calculations and then confirm the Smith Chart.


    grateful
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    A quarter wave matching transformer matches the source impedance Zs to the load impedance ZL via the line impedance Zo according to the relationship

    Zs=(Zo)^2/ZL

    If ZL=75Ω and Zs=300Ω then the required Z0=√(Zs*ZL)=√(300*75)=150Ω
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Do you have access to a Smith Chart simulation program?
     
  4. Alfa_ET

    Thread Starter New Member

    Feb 26, 2011
    17
    0

    No, i don't.
     
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