Equal Split Wilkinson Power Divider - Project Presentation

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Equal Split Wilkinson Power Divider - Project Presentation

  1. 1. Bhanwar SinghJ Muralidhara Chary
  2. 2.  Power divider divides input power into two or more signals of lesser power. Passive circuits E.g. T junction power divider, resistive divider, Wilkinson divider.
  3. 3.  Providing a signal sample for measurement or monitoring. In feedback circuits. In combining feeds to and from antennae Providing taps for cable distributed systems such as cable TV. Separating transmitted and received signals on telephone lines.
  4. 4.  Can be used to split power in any ratio. Lossless when the output ports are matched i.e. only reflected power gets dissipated. 3-dB power divider makes use of quarter wave transformers. Easily fabricated, cheap and high performing.
  5. 5.  Design of Equal -Split Wilkinson power divider with specifications : f = 2.4 GHz. Source Impedance = 50 ohms. Load Impedance = 50 ohms Substrate permittivity = 3.38 Thickness of substrate = 1.524 mm Thickness of conductor = 0.15 mm
  6. 6. For matching port 2 for even mode excitation,we have to make
  7. 7.  We obtain: We can obtain using transmission line equations.
  8. 8. Looking into port 2 we see a impedance of r/2.For port 2 to be matched for odd mode excitation we select r=2.Thus we obtain :
  9. 9.  With the above calculated Z and r values we can find the input impedance at port 1 as
  10. 10.  In summary we can establish the following S-parameters for the wilkinson divider:
  11. 11. Z0 √2 Z0 (Charteristic 2Z0 (Shunt Resistor) Impedance of quarter wave transformer)50 Ω 70.71 Ω 100 Ω Then we used LINECALC to calculate length and width of microstrip lines – For Zo=50 Ohm, at λ/4 W=3.37 mm, L= 19.19mm For Z= √2Zo=70.71 Ohm at λ/4 W= 1.56mm, L=19.86 mm
  12. 12. m1freq= 2.466GHzdB(S(2,1))=-3.042 0 m1 -5dB(S(3,1))dB(S(2,1))dB(S(1,1)) -10 -15 -20 -25 1.0 1.5 2.0 2.5 3.0 3.5 4.0 freq, GHz
  13. 13. Thank you for your kind attention !!

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