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access icon openaccess Modelling the transient emission from a twin conductor cable

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 11/12/2015, Accepted 14/12/2015, Published 16/12/2015

Using the equations of transmission line theory, a programme is developed to simulate the response of an open-circuit line to a step pulse. This is compared with the observed response of a twin-conductor cable. It is deduced that not all of the current delivered to the send conductor arrives back via the return conductor. Some of it departs in the form of radiated emission. A virtual capacitor is used to simulate this, with limited success. However, by adding a second virtual capacitor to simulate transient current being delivered from the return conductor back to the send conductor, a fair correlation is achieved between theoretical and actual results. This analysis demonstrates that the return conductor plays an active role in propagating any signal along the cable. This study also demonstrates that a circuit model can be created to simulate the mechanisms involved in the radiation of interference from power supply cables. This is but one example of the use of circuit models to analyse electromagnetic interference (EMI). The key relationship between electromagnetic theory and circuit theory which enables this technique to be used to analyse any EMI problem is identified. A dramatic simplification in the mathematics can be achieved.

Inspec keywords: transmission line theory; telecommunication cables; electromagnetic interference; transient analysis

Other keywords: radiated emission; twin-conductor cable; send conductor; interference radiation; step pulse; electromagnetic theory; transmission line theory; circuit theory; power supply cables; transient emission modelling; electromagnetic interference; EMI problem; return conductor; open-circuit line response; transient current simulation; virtual capacitor; circuit model

Subjects: Electromagnetic compatibility and interference; Transmission line links and equipment; Transmission line theory

References

    1. 1)
      • 16. Ott, H.W.: ‘Grounding’, ‘Noise reduction techniques in electronic systems’ (John Wiley & Sons, Inc., 1988, 2nd edn.), pp. 77–88.
    2. 2)
      • 18. Kaiser, K.L.: ‘Grounding’, ‘Electromagnetic compatibility handbook’ (CRC Press, 2005), pp. 28–83 to28–85.
    3. 3)
      • 8. Available at https://www.en.wikipedia.org/wiki/Photon, accessed October 2015.
    4. 4)
      • 15. Darney, I.B.: ‘Bench testing’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 197–206.
    5. 5)
      • 6. Darney, I.B.: ‘Transient analysis’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 149–150.
    6. 6)
      • 17. Paul, C.R.: ‘System design for EMC’, in Chang, K., (Ed.): ‘Introduction to electromagnetic compatibility’ (John Wiley & Sons, Inc., 2006, 2nd edn.), pp. 796–802.
    7. 7)
      • 11. Darney, I.B.: ‘Practical design’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 224–226.
    8. 8)
      • 5. Skitek, G.G., Marshall, S.V.: ‘Transmission lines’, Electromagnetic concepts and applications’ (Prentice-Hall, Inc., 1982), pp. 411–413.
    9. 9)
      • 10. Smith, A. A.Jr.: ‘Plane-wave excitation’, in : ‘Coupling of electromagnetic fields to transmission lines’ (Interference Control Technologies, Inc., 1989), pp. 38–45.
    10. 10)
      • 9. Available at http://www.designemc.info/ZipMTE.zip, accessed October 2015.
    11. 11)
      • 3. Skitek, G.G., Marshall, S.V.: ‘Transmission lines’, ‘Electromagnetic concepts and applications’ (Prentice-Hall, Inc., 1982), pp. 409–411.
    12. 12)
      • 13. Darney, I.B.: ‘Transmission line models’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 82–89.
    13. 13)
      • 12. Darney, I.B.: ‘Lumped parameter models’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 45–49.
    14. 14)
      • 4. Skitek, G.G., Marshall, S.V.: ‘Transmission lines’, ‘Electromagnetic concepts and applications’ (Prentice-Hall, Inc., 1982), pp. 380–384.
    15. 15)
      • 7. Darney, I.B.: ‘Bench testing’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 183–188.
    16. 16)
      • 1. Darney, I.B.: ‘The hybrid equations’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 273–276.
    17. 17)
      • 14. Darney, I.B.: ‘Antenna models’, in Duffy, A. (Ed.): ‘Circuit modeling for electromagnetic compatibility’ (SciTech Publishing, Edison, NJ, 2013), pp. 107–113.
    18. 18)
      • 2. Skitek, G.G., Marshall, S.V.: ‘Antennas’, ‘Electromagnetic concepts and applications’ (Prentice-Hall, Inc., Englewood Cliffs, NJ, 1982), pp. 456–463.
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