Short Term Scientific Mission of COST 286
description
Transcript of 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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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
]
University of Split, FESB
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]
University of Split, FESB
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
University of Split, FESB
Comparison of Wroclaw and Hanover simulation results
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
University of Split, FESB
Comparison of Wroclaw and Hanover simulation results
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
University of Split, FESB
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
University of Split, FESB
Split measurement set-up in existence
The wire above a ground plane, height 80 cm, pol. x.
University of Split, FESB
Split configuration of the antenna and wires
Details of measurement set-up, height 80 cm, pol. x.
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
Results of measurements and simulations
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
University of Split, FESB
Results of measurements and simulations
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
University of Split, FESB
Results of measurements and simulations
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
University of Split, FESB
Results of measurements and simulations
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
University of Split, FESB
Results of measurements and simulations
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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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
University of Split, FESB
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.
University of Split, FESB
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
University of Split, FESB
Thank you for your attention