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16.360 Lecture 9

16.360 Lecture 9. Last lecture. Parameter equations input impedance. 16.360 Lecture 9. Parameter equations. Unit circuit. . Short Circuit load. B. Open Circuit load. 16.360 Lecture 9. Parameter equations. 16.360 Lecture 9. An example. Smith Chart. Input impedance.

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16.360 Lecture 9

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  1. 16.360 Lecture 9 • Last lecture • Parameter equations • input impedance

  2. 16.360 Lecture 9 Parameter equations Unit circuit . Short Circuit load B Open Circuit load

  3. 16.360 Lecture 9 Parameter equations

  4. 16.360 Lecture 9 An example Smith Chart Input impedance Wavelength toward generator (WTG) Smith Chart

  5. 16.360 Lecture 9 An example find Zin (-0.1) Smith Chart Constant || circle, SWR Circle

  6. 16.360 Lecture 9 Today: • SWR, Voltage maxima and minima • Impedance to Admittance transformations

  7. + + |V(z)| |V(z)| |V0| [1+ | |], |V0| [1 - | |], = = max min 16.360 Lecture 9 SWR, voltage maximum and minimum If Smith Chart Recall: when 2z + r = 2n. when 2z + r = (2n+1).

  8. 16.360 Lecture 9 An example Smith Chart Impedance to Admittance transformations G: conductance, B, susceptance

  9. 16.360 Lecture 9 Normalized admittance z and y are directly opposite each other on Smith Chart

  10. 16.360 Lecture 9 An example A 50- lossless line is terminated in a load ZL = (25+j50). Use the smith chart to find a) voltage reflection coefficient, b) the voltage standing-wave ratio, c) the distances of the first voltage maximum and first voltage minimum from the load, d) the input impedance of the line, given the line is 3.3, and e) the input admittance of the line. Smith Chart

  11. 16.360 Lecture 9 Next lecture • Impedance matching

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