1. Introduction to Electromagnetic Compatibility
Chapter 1
Introduction to Electromagnetic Compatibility
Introduction to Electromagnetic Compatibility / C. R. Paul

2. Aspects of EMC

3. 3 criteria for electromagnetic compatibility

5. 3 ways to prevent interference

6. Basic EMC subproblem： (a) radiated emissions

7. Basic EMC subproblem： (b) radiated susceptibility

8. Basic EMC subproblem： (c) conducted emissions

9. Basic EMC subproblem： (d) conducted susceptibility

10. Electrostatic discharge (ESD)

11. Electromagnetic pulse (EMP)

12. Lightning

13. Secure communication and data processing (TEMPEST)

14. History of EMC Examples

15. History of EMC
Since 1920
FCC
IEC
CISPR
MIL-STD-461

16. Examples UK Destroyer-HMS Sheffield USA Helicopter-UH-60 Black Hawk
USA Aircraft Carrier-Forrestal

17. Electrcal Dimensions and Waves

18. Effect of element interconection leads

19. Time delay Free Space：3ns/1m。 3G Hz Transitioning time=100~500 ps。
Propogation velocity in glass epoxy=1.8108m/s。
6-in time delay=850 ps。

20. Current propagation Phase shift Z：position。
：phase constant (radians per meter)。
：2f (radians per second )。
Phase shift
：phase shift。
L：total length

21. Wave propagation
 =  z

22. The movement of a point on the waveform
Wave length
：wave length。
The movement of a point on the waveform

23. Wave propagation as time progresses

24. The velocity of wave movement
Differentiating
Wavelength

25. Phase shiftTime delay
One wavelength
Phase shift of 360 degrees

27. Frequency bands

28. Constants

29. Velocity of propagation in free space
Velocity of propagation in nonconductive media

30. Wave propagation in Teflon (r=2.1, r=1)

33. Exercise

34. Why decibel ?
Decibels have the propoty of compressing data. dB

35. Decibels and Common EMC Units

36. The use of the decibel(dB)：Power gaindB

37. Voltage gaindB & Current gaindB

38. Exercise

39. Referenced to some base quantity

40. Conversion

41. Exercise

42. Decibel for EMC

43. Exercise

44. Conversion to Decibels

45. Exercise

46. The use of the decibel in computing amplifier performance

47. Power Loss in Cables

48. Transmission line equations (forward & backward travelling wave)

49. Time domain equations (forward & backward travelling wave)

50. Voltage reflection coefficient
Reflection coefficient at load

51. Equation relation

52. Matched line
Without backward travelling wave

53. Average power delivered to position z (matched line)
Input power/output power (matched line)

54. Power loss in the cable (2 definitions, matched line)

55. Signal Source Specification

56. Signal source as a Thevenin equivalent circuit

57. An equivalent circuit for the signal measurer

58. Use of coaxial cables with matched loads

59. Calculation of a signal source outputIf

60. Example (1), matched load

61. Example (2), matched load
Can obtain a relation： =70
For example：-40dBm+10767dBV

62. Question
107?

63. Example
Another method

64. Example (3), matched load

65. Example (4), unmatched load
Method 1
Method 2

66. Example (5), signal measured by signal measurer
Method #1 OR

67. Method #2
107-30=77

68. Exercise

69. Exercise