Usage of Ansoft/HFSS simulation tool in mobile device development Jari Jekkonen.
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Transcript of Usage of Ansoft/HFSS simulation tool in mobile device development Jari Jekkonen.
Usage of Ansoft/HFSS simulation tool in mobile device developmentJari Jekkonen
2 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Content
• Commercial, non-commercial and in-house 3D EM tools used in NOKIA
• Development process of mobile phone
• Simulation goals
• Early verification of EM properties of the device
• Design check / validation
• Timing for simulations
• Sample models
• Discussion
3 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Commercial, non-commercial and in-house 3D EM tools used in NOKIA• Commercial
• Ansoft/HFSS (FEM)
• CST/MWS (FDTD/FIT)
• Flomerics/EMC/FLO (TLM)
• FEKO (MoM/FEM)
• IE3D (MoM)
• Non-commercial• NEC (MoM)
• In-house• Aplac – FDTD
• Boundary-element method by HUT
4 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Current status of the usage of the HFSS in NOKIA• NOKIA wide EMC simulations network
• Re-use of simulation models (model library)
• Early verification by simulations • started in some sites
• Part of the minimum block design process
• Iterative between mechanics, BB, RF and EMC
• NOKIA wide tool for EM simulations• Import:
• SAT
• STEP
• IGES
• AutoCAD DXF
• SLD
• GEO
• STL
• Export• SAT
• JPEG
• GIF
• BMP
• TIFF
• 3D modeller
• AutoCAD DXF
• VRML
5 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Development process of the mobile phone
• General steps of the mobile phone development
• M-steps are the maturity check points of the phone development (technology maturity)
are prototype builds
• E-steps are the execution points of product program (management level)
E-1 E0 E0.5 E1 E1.5 E5E2 E3 E4
Pre-study / technology freezePre-study / technology freezeTechnology implementationTechnology implementation
productionproduction
P1 P2 P3 P4 P5 P6
M0 M2 M3 M4 M5 M6 M7M1 M8 M9 M10 M11 M12
SaleSale
Product maturity steps
Project execution milestones
Product builds
P_
6 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Early verification of EM properties of the deviceGoals are
• to increase EM quality of the product
• to have less HW prototyping during the development project
-> Shorten design time
• Reduce testing time
• to produce design rules for following projects
7 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Early verification of EM properties of the device• IOP simulations
• Antenna simulations• prototyping
• EM separation of antennas
• Noise coupling between BB parts and antennas• E.g. Camera noise to GSM antenna
• Hinge simulations• Conductive vs. non-conductive
• Surface material effects
• Optimum placement for sensitive components• SIM
• MMC, SD, etc.
• Risk level estimation based on simulations• Done already for couple of projects
8 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
9 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
10 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Isolation between GSM antenna and SIM lines
11 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Isolation between GSM antenna and display
12 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Design check / validation
• EMC measurements vs. simulations• Model updates
• Re-use blocks to simulations library
• Shielding modifications• E.g. SIM reader is designed by simulations for Gromit
• IOP measurements vs. simulations• Antenna measurements vs. simulations
• Design updates
13 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Timing for simulations
E-1 E0 E0.5 E1 E1.5 E5E2 E3 E4
Pre-study / technology freezePre-study / technology freezeTechnology implementationTechnology implementation
productionproduction
B1 B2 B3 B4 B5 B6
M0 M2 M3 M4 M5 M6 M7M1 M8 M9 M10 M11 M12
Pre-concept simulation
Detection of potential EMC risks in whole concept and development
of general simulation
plan.
HFSS
Concept simulations
Check for placement of main blocks (antenna,
battery, SIM, MMC, camera,
RF)
HFSS
First test
Draft test of coupling
between parts and antenna (model from other project
is used)
HFSS
Calculation of the near-field radiation and
detection of hot spots on PWB
Second test of coupling
between parts and antenna
HFSS, SIWave
Verification with available proto
EMC checks based on calculation of 3-D
analysis of the EM field inside the product
HFSS, SIWave
SaleSale
14 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Pre-concept model
• Not very detailed model
• First draft for antenna solution
• Structural resonances
• Best places for sensitive modules/components
concept level model
• More details
• Some component/module locations are fixed
• Simulations for design help
15 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
concept level model
Camera
Grounding points• More details
• Some component/module locations are fixed
• Simulations for design rules
16 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E-field 900MHz (GSM)
17 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E-field 1750MHz (GSM)
18 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E-field 1900MHz (GSM)
19 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E-field 1980MHz (WCDMA)
20 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
First tests
• Detailed models for EM-parts (connectors, memory card readers, etc.)
• Working antenna model
• All shields and other conductive parts fixed
• Firs EMC tests done and compared to simulations
• Corrections for design (using simulations)
21 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E & H-field 900MHz (GSM)
22 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E & H-field 900MHz (GSM)
23 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E & H-field 1750MHz (GSM)
24 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E & H-field 1750MHz (GSM)
25 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E & H-field 1900MHz (GSM)
26 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E & H-field 1900MHz (GSM)
27 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
E & H-field 1980MHz (WCDMA)
28 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
GSM900 (ver. 1)
Very critical area!
29 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
GSM1800 (ver. 1)
30 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
GSM1900 (ver. 1)
31 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
GSM900 (ver. 2)
32 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
GSM1800 (ver. 2)
33 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
GSM1900 (ver. 2)
34 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Conclusions
Simulation• tools are very useful from the very beginning of the design
process• can be used as a risk analysis tool of the EM environment of the
product• can be used to make prototyping with limitations• may be used to produce design rules for daily engineering work
35 © 2005 Nokia cost_presentation.ppt / 2005-12-13 / JJ
Questions?