characteristic impedance

characteristic impedance

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characteristic impedance

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Presentation Transcript

1. characteristic impedance

2. z-z z z+z Telegraphist's equations

3. w d D z strip line

4. Time harmonic excitation movie

5. z-z z z+z Wave equation

6. z-z z z+z Wave equation k is the wave number

7. z-z z z+z Wave equation

8. z-z z z+z Wave equation current wave

9. z-z z z+z characteristic impedance

10. z-z z z+z characteristic impedance

11. w d D z strip line

12. w d D z strip line

13. D z a b coaxial cable

14. a = 3 mm b = 6 mm coaxial cable

15. D D z a twin lead

16. w d D z D z a b D D z a summary

17. w d D z D z a b D D z a summary

18. terminations standing wave VSWR

19. -z Help! terminations Zc ZL z = 0 Why?

20. -z Zc ZL z = 0 terminations

21. -z Zc ZL z = 0 terminations normalized impedance

22. -z Zc ZL z = 0 reflection coefficient

23. Pulse propagation from one transmission line to another

24. Pulse propagation from one transmission line to another

25. -z Zc ZL z = 0 reflection coefficient 3 special cases "short" "matched" "open"

26. -z Zc ZL z = 0 Incident plus reflected waves. Incident plus reflected waves. reflection coefficient

27. R = -1

28. Standing wave movie

29. R = +1

30. standing wave R = +1 R = -1 -z z = 0

31. VSWR

32. Let us examine other values of the reflection coefficient.

33. probe w narrow slit d D z

34. D z a probe narrow slit b

35.  2 1.5 1 Minimum deflection Maximum deflection Zc ZL z = 0 -z

36. Phase shift in the reflection coefficient

37. l 1 + |R| 1 - |R|

38. -z Zc ZL z = 0 Incident plus reflected waves. Incident plus reflected waves. reflection coefficient

39. -z Zc ZL z = 0 impedance along the line

40. -z Zc ZL z = 0 impedance along the line

41. -z Zc ZL z = 0 impedance along the line

42. -z Zc ZL z = 0 impedance along the line

43. -z Zc ZL z = 0 impedance along the line

44. -z Zc ZL z = 0 impedance along the line Look at a distance z = - L toward the generator

45. -z Zc ZL z = 0 impedance along the line impedance is periodic every half-wavelength

46. -z Zc ZL z = 0 impedance along the line quarter wavelength Z <==> Y short ==> open open ==> short

47. -z quarter wave transformer Zc1 Zc2 ZL z = 0 matching frequency sensitive

48. -z Zc ZL z = 0 shorted line open line all values of reactance

49. L X = Zc tan kL

50. Should I add something in series or in parallel?