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Short Term Scientific Mission of COST 286

Short Term Scientific Mission of COST 286. Beneficiary: Jacek Skrzypczynski, Wroclaw University of Technology Host: Vesna Roje, University of Split,FESB Period: from 5 to 9 September 2005 Place: Split, Croatia. Aim of the mission.

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Short Term Scientific Mission of COST 286

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  1. Short Term Scientific Mission of COST 286 • Beneficiary: Jacek Skrzypczynski, Wroclaw University of Technology • Host: Vesna Roje, University of Split,FESB • Period: from 5 to 9 September 2005 • Place: Split, Croatia

  2. Aim of the mission Matters of COST 286 JTA1 first phase : Wire above a ground plane in an open area • study of independent simulations conducted by different participants • consideration of simulations validation procedure • setting-up measurement system • accomplishment of measurements • discussion of results

  3. COST 286 JTA1 generic problem Location of the wire over ground plane and positions of the antenna

  4. Comparison of applied simulation methods • Wroclaw • MoM numerical electromagnetic code NEC • Split • MoM numerical electromagnetic code NEC • Hanover • MoM numerical electromagnetic code CONCEPT • Madrid • Finite Difference Time Domain Method

  5. Differences in problem modelling • modelling the wire and the excitation antenna with thin wires (W,S,H) or with cube segments (M) • modelling the ground plane as infinite one (W,S), or finite one (H,M) • modelling the finite ground plane as a wire mesh (M) or composition of plates (H) • various length of the dipole • diverse position of the wire loading resistors • distinct length of model segments

  6. Length of segments consideration The effect of segment length (5, 10 and 20 mm) on simulated (in Split) voltage drop over 50 Ohm wire load; h=80 cm; y-polarisation

  7. Influence of dipole to wire distance The effect of dipole to wire distance (dz=10, 15 and 20 cm) on simulated (in Split) voltage drop over 50 Ohm wire load; h=80 cm; y-polarisation

  8. Comparison of Wroclaw and Split simulation results Voltage across the load, wire length 1 m, height 5 cm, position xyz (top Split, bottom Wroclaw; Wroclaw results about 10% lower)

  9. Comparison of Wroclaw and Madrid simulation results Voltage across the load, wire length 1 m, height 5 cm, position x (top Wroclaw for 50 Ohm, bottom Madrid for 150 Ohm; Madrid results about 30 dB lower)

  10. Comparison of Wroclaw and Hanover simulation results Voltage across the load, wire length 1 m, height 5 cm, position x

  11. Comparison of Wroclaw and Hanover simulation results Voltage across the load, wire length 1 m, height 5 cm, position y; diverse dipole to wire distance dz=10 cm for (W) and dz=2 cm for (H)

  12. Comparison of Wroclaw and Hanover simulation results Voltage across the load, wire length 1 m, height 5 cm, position z

  13. Split measurement set-up • Wire 2.5mm2 • Metal plate 3x3 m • Equipment: • Generator: Motorola Communications System Analyzer R2001C 13dBm at 900MHz • Receiver: Anritsu Spectrum Analyzer MS 2663C • RBW : 30kHz • Dipole antenna: EMCO 3121C Set Model DB-4 • tuned to 900MHz • balun loss 0,6 dB • Coaxial cables: • generator - antenna N-N 10 m long • load - receiver N-BNC 3 m long • attenuation of cables 0,3 dB

  14. Split measurement set-up in existence The wire above a ground plane, height 80 cm, pol. x.

  15. Split configuration of the antenna and wires Details of measurement set-up, height 80 cm, pol. x.

  16. Liege configuration of the antenna and wires Details of measurement set-up, height 80 cm, pol. z 100W Cable to spectrum 50W input 1m cable Ground plane

  17. Comments to Liege measurement set-up • There is no vertical wire • Wire load is placed at 80 cm height • Monopol antenna is used instead of dipole one • Coaxial cables to the generator and to the receiver are in vicinity of the wire

  18. Results of measurements and simulations Results of modelling and measurements of voltage across the load, height 5 cm, pol. x.

  19. Results of measurements and simulations Results of modelling and measurements of voltage across the load, height 80 cm, pol. x.

  20. Results of measurements and simulations Results of modelling and measurements of voltage across the load, height 5 cm, pol. y.

  21. Results of measurements and simulations Results of modelling and measurements of voltage across the load, height 80 cm, pol. y.

  22. Results of measurements and simulations Results of modelling and measurements of voltage across the load, height 5 cm, pol. z.

  23. Results of measurements and simulations Results of modelling and measurements of voltage across the load, height 80 cm, pol. z.

  24. Ground plane effect on results of measurements Results for the wire above ground plane (red) and with no ground (black), h=80 cm, polarisation x

  25. Measuring cable layout effect on results of measurements Results for the cable covered with metal foil (black) and with no foil (red), h=80 cm, polarisation z

  26. Measuring cable layout effect on results of measurements Results for the cable laid on the ground (red) and put under ground (black), h=5 cm, polarisation z

  27. CONCLUSIONS • Results of simulation and measurements are in good agreement. • Changes in the antenna polarisation and height has very limited impact on maximum value of voltage that can be induced across the wire termination in the formulated problem. • The impact of the termination configuration and layout of the measuring cable should be taken into consideration more deeply. • The calculated and measured maximum value of voltage across the 150 Ohm termination is within limits of 6-12% of the antenna excitation value.

  28. DELIVERABLES From the STSM there will be the following deliverables and publications • A scientific report available to the cost action members. • Plan of at least two publications on EMC International Conferences: • Barcelona EMC Europe • Wroclaw EMC Symposium

  29. Thank you for your attention

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