jta1 antenna-wire coupling in the near field measurement results from ulg
DESCRIPTION
JTA1 Antenna-wire coupling in the near field Measurement results from ULg Ir. V. Beauvois ; Ir. M. Renard ; P. Beerten [email protected]. Original problem. 1, 5, 10 m D l 1m. -30cm -> l +30cm D x = 5 cm. 3 m. 150 . 5 → 30/80 cm. 1,5 m. GND plane. 1 m. 12 m. V. H. 10 cm. - PowerPoint PPT PresentationTRANSCRIPT
ULg - EMC Lab Barcelona - JTA1 1
JTA1 Antenna-wire couplingin the near field
Measurement results from ULg
Ir. V. Beauvois ; Ir. M. Renard ; P. [email protected]
ULg - EMC Lab Barcelona - JTA1 2
3 m
1, 5, 10 ml 1m
5 → 30/80 cm150
GND plane
12 m
-30cm -> l +30cmx = 5 cm
1 m1,5 m
V
10 cm10 cm
H
Original problem
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500
150
100 150 0
Ground plane (750*400)
50
200
250
0 100
400
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V
10 cm
10 cm
H //H
Position of the antenna used for simulation of a GSM phone
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- Wire Ø 1.78mm (2.5mm²) instead of 2mm ;- Equipments :
- Generator SMY02 R&S at 13dBm 900MHz- EMI Receiver ESI26 R&S
- RBW : 120kHz- m.t. : 1s
- CR100 (100)- Coaxial cables- “GSM” Antenna Kathrein ref. K71 166 1
brass rod in plastic tube- Dipole (for reference) HZ-13 R&S tuned for 900MHz
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1m cable
100
Ground plane
Cable to spectrum50 input
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5m cable
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Measurement conditions :
1m cable5cm, 10cm, 15cm, 20cm, 25cm, 30cm, 50cm, 80cm
5m cable5cm, 10cm, 15cm, 30cm, 50cm, 80cm(time consuming)
Longer cable : ground plane limit
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1m/5cm/monopole
0
0,005
0,01
0,015
0,02
0,025
x-direction (cm)
Vo
ltag
e (V
)
ant. vert.
ant. hor. perp.
ant. hor. //
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1m/80cm/monopole
0
0,005
0,01
0,015
0,02
0,025
0,03
x-direction (cm)
Vo
ltag
e (V
)
ant. vert.
ant. hor. perp.
ant. hor. //
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1m/5,30,80cm/monopole
0
0,005
0,01
0,015
0,02
0,025
-30
-15 0 15 30 45 60 75 90 105
120
x-direction (cm)
Vo
ltag
e (V
)
ant. vert. (5cm)
ant. vert. (30cm)
ant. vert. (80cm)
1m/5,30,80cm/monopole
0
0,005
0,01
0,015
0,02
0,025
-30
-15 0 15 30 45 60 75 90 105
120
x-direction (cm)
Vo
ltag
e (V
)
ant. vert. (5cm)
ant. vert. (30cm)
ant. vert. (80cm)
ULg - EMC Lab Barcelona - JTA1 14
1m/5,30,80cm/monopole
0
0,005
0,01
0,015
0,02
0,025
0,03
-30
-15 0 15 30 45 60 75 90 105
120
x-direction (cm)
Vo
latg
e (V
)
ant. hor. // (5cm)
ant. hor. // (30cm)
ant. hor. // (80cm)
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5m/5cm/monopole
0
0,002
0,004
0,006
0,008
0,01
0,012
0,014
0,016
0,018
-30 15 60 105
150
195
240
285
330
375
420
465
510
x-direction (cm)
Vo
ltag
e (V
)
ant. vert.
ant. hor. perp.
ant. hor. //
ULg - EMC Lab Barcelona - JTA1 16
5m/80cm/monopole
0
0,002
0,004
0,006
0,008
0,01
0,012
0,014
-30 15 60 105
150
195
240
285
330
375
420
465
510
x-direction (cm)
Vo
ltag
e (V
)
ant. hor. //
ant. hor. perp.
ant. vert.
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5m/5,30,80cm/monopole
0
0,002
0,004
0,006
0,008
0,01
0,012
0,014
0,016
0,018
-30 20 70 120
170
220
270
320
370
420
470
520
x-direction (cm)
Vo
ltag
e (V
)
ant. hor. // (5cm)
ant. hor. // (30cm)
ant. hor. // (80cm)
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dipole
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1m/50cm/monopole/dipole
0
0,002
0,004
0,006
0,008
0,01
0,012
0,014
x-direction (cm)
Volta
ge (V
)
dipole hor. //
ant. hor. //
*Some uncertainties : to be checked linked to cable attenuations
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Still to be done:• to check some measurements• to check the values (cable attenuation)• to compare our values with
• other measurements• simulations• influence of “site” (open site, anechoic room, metal plate in environment)