Use of RF Absorbing Materials for EMI Control
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1 Use of RF Absorbing Materials for EMI Control May 24, 2010 Bruce Archambeault Eric Chikando Sam Connor 1
2 PART-1 Application of Lossy Materials: - Metal enclosure - 2
3 Metal box photos 3
4 Metal box high order modes computation (up to 2.5GHz) 12 in 10 in 6 in TE(n,m,l) FREQ [GHz] d = 6 in a = 12 in b = 10 in
5 5
6 Resonance of the slots f r L OR, slot 2* = λ 2 f r = c L phys Slot 1: Horizontal slot Lphys = 8in FRes = 738MHz Slot 2: Vertical slot Lphys = 4in FRes = 1.47GHz 6
7 FDTD Simulation TE201 Metal Box Simulation TE111 with Lossy material (UD1154) on Top-side 115 TE110 TE101 TE121 TE102 TE112 TE Amplitude of Emissions [dbuv] TE Max E (empty box) [dbuv] Max E (ARCTop) [dbuv] Frequency [GHz] 7
8 Ansoft LLC 0.00 Metal enclosure resonance HFSS simulation XY Plot 1 Curve Info Air Shielding db(st(coax_pin_t1,coax_pin_t1)) Setup1 : Sw eep m6 m5 db(s(1,1)) m1 m2 m3 Probe resonance Lphysical = 16 in /ג) m4 m7 Name X Y m m m m m m m Freq [GHz] 8
9 Lossy Material Specifications ε + r = ε ' r j ε" r r = μ' r j μ" r μ 9
10 Effect of adding lossy material (Type: UD11554) on top-side TE110 TE201 Regular box UD-175mil (top) S21-Magnitude [db] TE101 TE111 TE121 TE102 TE112 TE212 TE Freq [Hz] x
11 Effect of adding lossy material to either Top or Bottom side TE110 TE201 Regular box UD-175mil (top) UD-175mil (bottom) S21-Magnitude [db] TE101 TE111 TE121 TE102 TE112 TE222 TE Freq [Hz] x
12 Effect of adding lossy material to either Top or Left side S21-Magnitude [db] TE110 TE101 TE111 TE201 TE121 TE102 TE112 TE212 Regular box UD-175mil (top) UD-175mil (left) TE Freq [Hz] x
13 Effect of adding lossy material to BOTH Top & Left side TE110 TE201 Regular box UD-175mil (top & left) S21-Magnitude [db] TE101 TE111 TE121 TE102 TE112 TE212 TE Freq [Hz] x
14 Effect of adding lossy material around H-slot: Type: UD TE110 TE201 Regular box UD-175mil (top) UD-175mil (around H-slot) S21-Magnitude [db] TE101 TE111 TE121 TE102 TE112 TE212 TE Freq [Hz] x
15 Effect of adding lossy material around H-slot: Type: WTEBIG TE110 TE201 Regular box Regular box w/wtebig around Hslot TE111 S21-Magnitude [db] TE101 TE121 TE102 TE112 TE212 TE Freq [Hz] x
16 Effect of adding lossy material around H-slot: Type: WTEBIG TE110 TE201 Regular box UD-175mil (top) UD-175mil (top) w/wtebig around Hslot S21-Magnitude [db] TE111 TE101 TE121 TE102 TE112 TE212 TE Freq [Hz] x 10 9
17 Effect of WT-BPIG material S21-Magnitude [db] TE110 TE101 TE111 TE201 TE121 TE102 Regular box W T-BPIG-60mils (top) W T-BPIG-60mils (bottom) TE112 TE222 TE Freq [Hz] x
18 PART-2 Application of Lossy Materials: - High speed I/O Cables - 18
19 EMI Control for I/O Cables Absorbing Material vs Ferrites Rear view photo of ZMR showing Ferrite dongles on cables At 70g each, can add: ~ 20 Lbs of weight to products!! Photos of ethernet cables with one showing lossy material around cable jacket 19
20 EMI Control for I/O Cables Absorbing Material Performance Case1: Plain cable Case2: Cable with improved jacket dB -25 Emission [db] dB 7dB 12dB dB Upcoming CISPR & VCCI radiated emissions limits are 4 db more strict in this frequency range Freq [GHz] x
21 Ethernet cables w/lossy jackets (up to 20GHz) S21-Magnitude [db] WH-B1 (6ft) WH-B2 (6ft) WH-B3 (6ft) WH-B4 (6ft) WH-B5 (6ft) WH-A (6ft) Regular cable (5.25ft) Regular cable (7ft) Noise ref level Freq [Hz] x
22 Ethernet cables w/lossy jackets (up to 6GHz) S21-Magnitude [db] WH-B1 (6ft) WH-B2 (6ft) WH-B3 (6ft) WH-B4 (6ft) WH-B5 (6ft) WH-A (6ft) Regular cable (5.25ft) Regular cable (7ft) Freq [Hz] x
23 Partially covered cables (20mils thick) 23
24 Additional Cable Photos Fig1(a): 2-inch sectional Fig1(b): 11-inch coverage Fig1(c): 23-inch coverage Fig1(d): 37-inch coverage 24
25 Setup Photos Receive-End Drive-End 25
26 Ethernet cables w/less than full lossy coverage (drive-end) S21-Magnitude [db] Reference noise Reg-ethernet(5.25ft) Reg-ethernet(7ft) 2-INCH sections 11-INCH covered 23-INCH covered 37-INCH covered Freq [Hz] x
27 Ethernet cables w/less than full lossy coverage (receive-end) S21-Magnitude [db] Reference noise Reg-ethernet(5.25ft) Reg-ethernet(7ft) 2-INCH sections 11-INCH covered 23-INCH covered 37-INCH covered Freq [Hz] x
28 Drive -vs- receive end (1 of 4) Reference noise 37-INCH covered(drive-end) 37-INCH covered(rcv-end) S21-Magnitude [db] Freq [Hz] x
29 Drive -vs- receive end (2 of 4) Reference noise 23-INCH covered(drive-end) 23-INCH covered(rcv-end) S21-Magnitude [db] Freq [Hz] x
30 Drive -vs- receive end (3 of 4) Reference noise 11-INCH covered(drive-end) 11-INCH covered(rcv-end) S21-Magnitude [db] Freq [Hz] x
31 Drive -vs- receive end (4 of 4) Reference noise 2-INCH covered(drive-end) 2-INCH covered(rcv-end) S21-Magnitude [db] Freq [Hz] x
32 Partially -vs- Fully covered cables S21-Magnitude [db] WH-B1 (6ft) WH-B2 (6ft) WH-B3 (6ft) WH-B4 (6ft) WH-B5 (6ft) WH-A (6ft) 2-Inch sectional Freq [Hz] x
33 EMI Control for I/O Cables Ethernet cable emissions improvement due to Lossy material Reduction in Emissions [db] Improv. to full coverage Improv. to 2inch sectional Improv. to 37inch covered Improv. to 23inch covered Improv. to 11inch covered Freq [GHz] 33
34 Fully covered cables (10mils thick) 34
35 Measurements of cables w/lossy jacket with various reference cables for improved dynamic range (1 of 2) Regular Ether. 2inch-sectional New ARC cable (sample1) New ARC cable (sample2) reference2 term reference w/time3 term S21-Magnitude [db] Freq [Hz] x
36 Measurements of cables w/lossy jacket with various reference cables for improved dynamic range (2 of 2) S21-Magnitude [db] Regular Ether. 2inch-sectional New ARC cable (sample1) New ARC cable (sample2) reference w/time3 term Freq [Hz] x
37 Measurements of lossy material on cables: Expanded view Regular Ether. 2inch-sectional New ARC cable (sample1) New ARC cable (sample2) S21-Magnitude [db] Freq [Hz] x
38 Cable emissions improvement due to lossy material 0 Improvement due to lossy material [db] inch-sectional New ARC cable (sample1) New ARC cable (sample2) Freq [Ghz] 38
39 PART-3 Application of Lossy Materials: - I/C Heatsink - 39
40 Drawing EMI Control for Heatsinks ~ 1GHz and Below Monopole Antenna Dependent on heatsink height Mitigated by grounding heatsink Heatsink Height Powerplane1 Ground1 Powerplane2 Ground2 Heatsink IC package Above 1 GHz Resonant Cavity Dependent on heatsink length & width Grounding heatsink does not help (can even aggravate) Mitigated by suppressing resonances Powerplane3 Powerplane1 Ground1 Powerplane2 Ground2 Heatsink Width Heatsink PCB stackup IC package Powerplane3 PCB stackup 40
41 EMI Control for Heatsinks Use EBG structure to suppress cavity resonances and lower emissions Make heatsink base plate into an EBG structure Add absorbing materials under heatsink to lower emissions Powerplane1 Ground1 Powerplane2 Ground2 Powerplane3 Lossy material surrounding IC package PCB stackup 41
42 Photos Fig1: HS baseplate w/300-mil thick material Fig2: HS baseplate w/500-mil thick material 42
43 Heatsink surrounded w/ud-175mil FDTD Simulation data 150 Heatsink surrounded w/300mils 140 Heatsink surrounded w/500mils Max. E-field [dbuv] dB 65dB Heatsink without lossy material Freq [GHz] 43
44 Heatsink surrounded w/ud-175mil Actual Measurement Results -45 Heatsink without lossy material Heatsink surrounded w/300mils lossy mat. -55 Heatsink surrounded w/500mils lossy mat. S21-Magnitude [db] dB 30dB Frequency [GHz] 44
45 Heatsink surrounded w/ud-175mil SAC data HS with no lossy material HS surrounded w/300mil lossy material HS surrounded w/500mil lossy material Radiated emissions [dbuv] dB 50dB Frequency [GHz] 45
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