Short Term Scientific Mission of COST 286

University of Split, FESB

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

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


COST 286 JTA1 generic problem

Location of the wire over ground plane and positions of the antenna

z

x

y

T (x, y, z)

h

L

z

yx

z

yx

T

z

yx

a)

b)

c)

d)

R10 cm

dz

dz

dz

10 cm

10 cm

LD

T

T


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


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


Length of segments consideration

ds=0.005m ds=0.010m ds=0.020m

X [m]1,41,210,80,60,40,20-0,2-0,4

U [m

V]

35,00

30,00

25,00

20,00

15,00

10,00

5,00

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


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

dz=0.100m dz=0.150m dz=0.200m

X [m]1,41,210,80,60,40,20-0,2-0,4

U [m

V]

35,00

30,00

25,00

20,00

15,00

10,00

5,00

0,00


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)

antenna parallel to X axis antenna parallel to Y axis antenna parallel to Z axis

X [cm]1301201101009080706050403020100-10-20-30

U [V

]

0,045

0,04

0,035

0,03

0,025

0,02

0,015

0,01

0,005

50 0 50 100 1500

0.01

0.02

0.03

0.04

x [cm]

U [V

]


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)

0 200 400 600 800 10000

2

4

6

x [cm]

U [

mV

]

0 2 4 6 8 100

0.01

0.02

0.03

0.04

x [m]

U [

V]


Comparison of Wroclaw and Hanover simulation results

Voltage across the load, wire length 1 m,height 5 cm,position x

Wroclaw/Hanover "x" 5cm

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

0,045

0,050

-0,30 -0,20 -0,10 0,00 0,10 0,20 0,30 0,40 0,50 0,60 0,70 0,80 0,90 1,00 1,10 1,20 1,30

[cm]

[V] Wroclaw

Hanover



Voltage across the load, wire length 1 m,height 5 cm,position y;

diverse dipole towire distance dz=10 cm for (W)

and dz=2 cm for (H)

Wroclaw/Hanover "y" 5cm

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

-0,30 -0,20 -0,10 0,00 0,10 0,20 0,30 0,40 0,50 0,60 0,70 0,80 0,90 1,00 1,10 1,20 1,30

[cm]

[V] Wroclaw

Hanover



Voltage across the load, wire length 1 m,height 5 cm,position z

Wroclaw/Hanover "z" 5cm

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

-0,30 -0,20 -0,10 0,00 0,10 0,20 0,30 0,40 0,50 0,60 0,70 0,80 0,90 1,00 1,10 1,20 1,30

[cm]

[V] Wroclaw

Hanover


Split measurement set-up

Wire 2.5mm2Metal plate 3x3 mEquipment:• 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 900MHzbalun loss 0,6 dB

• Coaxial cables:generator - antenna N-N 10 m long load - receiver N-BNC 3 m longattenuation of cables 0,3 dB


Split measurement set-up in existence

The wire above a ground plane, height 80 cm, pol. x.


Split configuration of the antenna and wires

Details of measurement set-up, height 80 cm, pol. x.


Liege configuration of the antenna and wires

Details of measurement set-up, height 80 cm, pol. z

1m cable

100

Ground plane

Cable to spectrum50 input


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


Results of measurements and simulations

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

0,000

0,010

0,020

0,030

0,040

0,050

0,060

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]

W. sim

H. sim

Split

Liege



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

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

0,045

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]W. sim

H. sim

Split

Liege



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

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

0,045

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]

W. sim

H. sim

Split

Liege



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

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

0,045

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]

W. sim

H. sim

Split

Liege



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

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]W. sim

H. sim

Split

Liege



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

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]

W. sim

H. sim

Split

Liege


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

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]

no metal plate

metal plate


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

0,000

0,005

0,010

0,015

0,020

0,025

0,030

0,035

0,040

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]with metal foil

no metal foil


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

0,000

0,005

0,010

0,015

0,020

0,025

-40 -20 0 20 40 60 80 100 120 140

x position [cm]

Vo

lta

ge

[V

]under ground

above ground


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.


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


Thank you for your attention

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Short Term Scientific Mission of COST 286

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