electronic products.
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Make the receptor less susceptible to the emission
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FPC is the radiator ?
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E
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Case Study II : Transmission Line on Imperfect reference planes
30cm 15cm
Fig 1. case 1
Fig 2. case 2
15cm
1cm 3cm 2cm
2cm 30cm
1cm
2cm
2cm 1.5cm
2cm
30cm
15cm
Fig 3. case 3
Fig 4. case 4
How about their EMI performance ? Thinking …..
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30cm
15cm
Case 1
Case 2
00.20.40.60.81
Frequency(GHz)
10203040506070
8090100E (d B u V /m )
FDTD simulation measurement
case 1
case 2
Case Study II : Transmission Line on Imperfect reference planes
Simulation v.s. measurement
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15cm
1cm
3cm 2cm
2cm
30cm
1cm
2cm
2cm
1.5cm
2cm
30cm
15cm
Case 4
Case 3
case 4
case 3
00.20.40.60.81
Frequency(GHz)
10203040506070
8090100E (d B u V /m )
FDTD simulation measurement
Case Study II : Transmission Line on Imperfect reference planes
Simulation v.s. measurement
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Case 1Case 2
EMC Lab. NTUEE32 Case 3Case 4
Case 1Case 2
EMC Lab. NTUEE33 Case 3Case 4
Case 1Case 2
EMC Lab. NTUEE34 Case 3Case 4
Case 1Case 2
EMC Lab. NTUEE35 Case 3Case 4
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A capacitor was chosen to improve SI and EMI problems for case 2
2.2F µCase Study II : Solving approach
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Impedance Profile by TDR
500
1000
1500
2000
2500
Time(ps)
405060708090100110
120130I m p e d a n c e (o h m )
case 1case 2
case 2+2.2uF
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Case Study II : Solving approach
0.2
0.4
0.60.81
Frequency(GHz)
10203040506070
8090100E (d B u V /m )
FDTD simulation measurement
case 2
case 2 +2.2uF
EMI performance
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Distribution of Current Density on the Reference Plane
Time step=400Time step=800
Time step=1200Time step=1600
