CORRELATION BETWEEN RADIATED IMMUNITY AND COUPLING ATTENUATION Michiel Pelt
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Transcript of CORRELATION BETWEEN RADIATED IMMUNITY AND COUPLING ATTENUATION Michiel Pelt
![Page 1: CORRELATION BETWEEN RADIATED IMMUNITY AND COUPLING ATTENUATION Michiel Pelt](https://reader035.fdocuments.us/reader035/viewer/2022062517/568136dc550346895d9e78cd/html5/thumbnails/1.jpg)
Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
CORRELATION BETWEEN
RADIATED IMMUNITY
AND
COUPLING ATTENUATION
Michiel Pelt
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Introduction
Need for new test method:
No test methods to measure: symmetrical cables, connecting
hardware / cable assemblies balance at higher frequencies combined effect of balance and
screening
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Introduction
Coupling attenuation
New and easy test method to evaluate the EMC performance of channels and components (symmetrical + screened)
Standard prepared by CENELEC TC 46X / WG3: EN 50289-1-6
Under discussion in ISO / IEC JTC1 SC25 WG 3 and CLC TC 215 WG 1
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Introduction
A near field measurement
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Introduction
Simplifications
Device under test: unshielded twisted pair cable coaxial cable dual foil balanced cable
Radiated immunity according to IEC 61000-4-3 fixed position antenna and device
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Coupling attenuation
Coupling attenuation
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Coupling attenuation
Definition coupling attenuation
ac = 10 LOG10 ( P1 ) max [ P2n; P2f ]
ac coupling attenuationP1 input power inner circuitP2n maximum near end peak powerP2f maximum far end peak power
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Coupling attenuation
Limits of coupling attenuation
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Coupling attenuation
Unshielded twisted pair cable
0
30
60
90
120
10 100 1000
FREQUENCY (in MHz)
CO
UP
LIN
G A
TT
EN
UA
TIO
N(i
n d
B)
54 dB
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Coupling attenuation
Coaxial cable
0
30
60
90
120
10 100 1000
FREQUENCY (in MHz)
CO
UP
LIN
G A
TT
EN
UA
TIO
N(i
n d
B)
52 dB
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Coupling attenuation
Dual foil twisted pair cable
0
30
60
90
120
10 100 1000
FREQUENCY (in MHz)
CO
UP
LIN
G A
TT
EN
UA
TIO
N(i
n d
B)
86 dB
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Radiated immunity
Semi-anechoic room (13.2 x 4.7 x 3.0m)Antenna - set-up: 3 mThree amplifiers, two antennas
30 - 200 MHz 200 - 500 MHz 500 - 1000 MHz
Incident field: about 3 V/m (not modulated)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Dimensions cabling set-up
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Justification for cabling set-up
Testing active equipment with cabling (proposal to CISPR G)
Features cabling set-up: gain / frequency response flat polarization not critical direction not critical
(worst case perpendicular to incident field)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Set-up inside semi-anechoic chamber
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Set-up inside semi-anechoic chamber
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Uniform area of cabling set-up
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Field uniformity according to
IEC 61000-4-3
16 points over 1.5 m x 1.5 m surface 75 % values within 0 - 6 dB of nominal
value Field is not constant but uniform
( 83% horizontal; 89 % vertical)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Average field strength
0.0
2.5
5.0
7.5
10.0
0 200 400 600 800 1000
FREQUENCY (MHz)
FIE
LD
ST
RE
NG
TH
(V
/m)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Unshielded twisted pair cable
-100
-80
-60
-40
-20
0
0 200 400 600 800 1000
FREQUENCY (MHz)
PO
WE
R (
dB
m)
-35 dBm
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Coaxial cable
-35 dBm
-100
-80
-60
-40
-20
0
0 200 400 600 800 1000
FREQUENCY (MHz)
PO
WE
R (
dB
m)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Radiated immunity
Dual foil twisted pair cable
-70 dBm
-100
-80
-60
-40
-20
0
0 200 400 600 800 1000
FREQUENCY (MHz)
PO
WE
R (
dB
m)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Conclusions
Conclusion 1: Relative agreement
Same difference between coupling attenuation and induced power for all tested cables
For each test method same deviation between curves for balanced and unbalanced cables using
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Correlation
Gain of set-up
G() = 4 Af()
G( antenna gainAf( antenna aperture wavelength
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Correlation
Unshielded twisted pair cable
-100
-80
-60
-40
-20
0
0 200 400 600 800 1000
FREQUENCY (MHz)
PO
WE
R (
dB
m)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Correlation
Coaxial cable
-100
-80
-60
-40
-20
0
0 200 400 600 800 1000
FREQUENCY (MHz)
PO
WE
R (
dB
m)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Correlation
Dual foil twisted pair cable
-100
-80
-60
-40
-20
0
0 200 400 600 800 1000
FREQUENCY (MHz)
PO
WE
R (
dB
m)
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Conclusions
Conclusion 2: Absolute agreement
The induced noise power can be calculated using the values for coupling attenuation
The calculated induced power fits the measured powers for all cables
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Michiel Pelt, Nexans Cabling Solutions, Alsembergsestw 2b3, B-1501 Buizingen, Belgium
Conclusions
Errors during correlation
Incident field uniform but not constantGain set-up varies with frequencyCoupling attenuation approached by
envelope curve ...