Simulation Advances for IoT Devices and Infrastructure...

© 2011 ANSYS, Inc. December 12, 2014

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Simulation Advances for IoT Devices and Infrastructure

Dr. Larry Williams

[email protected]

3 © 2014 ANSYS, Inc. December 12, 2014 ANSYS Confidential

Physics-based Simulation

Electric Machine & Drive Advanced Materials Robust Electronics

Fluid-Thermal Fluid-Mechanical

© 2011 ANSYS, Inc. December 12, 2014 4 © 2013 ANSYS, Inc. December 12, 2014 ANSYS Confidential

Traditional Design Flow

Concept Design Physical

Prototype Testing Analysis Production Yes

No

CAD CAE


Concept & Design

Physical

Prototype

Production

Simulation-Driven Product Development

Simulation-Driven Product Development


HPC and Hardware

• High Performance Computing (HPC) – Increased productivity by leveraging modern compute technologies

Bigger

Faster

Higher Fidelity


Applying Engineering Simulation

Challenges • Extreme Performance • Breakthrough Innovation • New Opportunities

Simulation technology enables engineers to predict with confidence that products will work in the real world.


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IoT from a Simulation Perspective


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New Opportunities

“The Internet of Things sets up the potential for a new wave of hardware entrepreneurs…” “Combine a standard low-cost development platform incorporating low-power processors and wireless connectivity with ongoing innovation in sensors and you have a recipe for a renaissance in hardware development.” “Because the barrier to entry is so low, even a small three-person start-up working out of a garage can get funding on Kickstarter and design a new hot product that’s limited only by the imagination.”

Dr. Henry Samueli Cofounder, Broadcom


• Fundamental building blocks for IoT – Antennas – Power Management – Embedded Software – Thermal Management – High-Speed Communication – Sensors

• Simulation has a large role to play!

Internet of Things Applications

Home Medicine Grid Automotive


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Antennas, Wireless, Interface Systems Internet of Things

Communications

Communication Systems

R/W coil

Tag coil

Wireless Power Transfer Receiver Electrode

Field Coupling

Driver Electrode

Touchpanel


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Silver Spring Networks Smart Meter


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• Founded in July 2002

• Headquartered in Redwood City, CA

• Creating a leading smart grid network

– Networking technology platform

• Broadened beyond the smart grid to networking other critical infrastructure such as street lights

Silver Spring Networks

ANSYS, Inc. Proprietary

© 2009 ANSYS, Inc. All rights reserved. © 2014 ANSYS, Inc. December 12, 2014 14

Physical Prototype

Virtual Prototypes

Far-Field Pattern

S-Parameters

HFSS Virtual Prototype

Virtual Compliance

Fields

Design Sensitivity

1-15 ANSYS, Inc. Proprietary

© 2009 ANSYS, Inc. All rights reserved. February 23, 2009

Inventory #002593 © 2014 ANSYS, Inc. December 12, 2014 15

• Silver Spring Networks Communication Module

– Dual-band Antenna, 900 MHz & 2.4 GHz

– RF Shields

• Integrating Communication Module with Electric meter – Vendor Board coupling to Silver Spring Network board

– DC Bias for Vendor Board.

– 3D Layout effects on Silver Spring Network Board

Simulation Driven Product Development



ANSYS HFSS 3D System Design

Multi-band Antenna Radiator Design

Platform Integration





• Dual-band Antenna Optimization

– 900MHz and 2.4GHz bands

• Effects of PCB

– True ground vs. perfect ground

• Effects of RF Shields on PCB

Design Challenges

Antenna

PCB RF Shields

Release 2014.0 December 12, 2014 L5-5: 18 © 2014 ANSYS, Inc.

HFSS Simulation

• Multiple Solution Frequencies

2400 MHz 900MHz

Excitation

Short

900MHz 2500MHz

Each frequency band excites a different part of the antenna. Meshing at a single frequency will not

guarantee accuracy.

Setup 1: 2400MHz

Dependent Mesh Setup: 900MHz

Sweep Converged Adaptive Meshing




• Parameters

Antenna Design and Optimization

Simulation Challenge: How do we leverage simulation to narrow the focus?

Antenna

Antenna Length1 Capacitive Gap Capacitive length

Antenna Length2 Slot Size Slot numbers




Partial S-parameters computed from derivatives

Cap Gap

Ant Width

Ant Length1

Cap Length

These few parameters have the most impact on the S11




• Optimization Goal – Minimize the S-parameters at 0.9 and 2.4 GHz

• Optimization Method – Sequential Non-Linear Programming

– Gradient approach with Response Surface

Antenna Design and Optimization

Converges after 110 iterations

Optimized Results

GSM Antenna > black

W-LAN Antenna > Red

Optimization Setup

Release 2014.0 December 12, 2014 L5-5: 22 © 2014 ANSYS, Inc.

Integrating the Antenna with RF Board

1. Import ODB++ file inside HFSS

2. Create a 3D Components for the antenna

3. Import the 3D component on the RF Board

1

2

3




• PCB > effect of Simulating Power and ground plane true geometries

Simulating the Whole PCB

Current distribution for WLAN Antenna

Ideal Ground True Ground




• PCB > effect of Simulating Power and ground plane true geometries

Simulating the Whole PCB

Including Real Geometries for Ground plane will have

a big impact on Simulations results

GSM Antenna > black (solid)

GSM Antenna (true ground) > black (dashed)

W-LAN Antenna > Red

W-LAN Antenna (true ground) > black (dashed)



ANSYS HFSS 3D System Design






• Effect of adding Vendor Board

Full System Simulations

GSM Antenna > black (solid)

GSM Antenna (With Vendor board) > black (dashed)

W-LAN Antenna > Red

W-LAN Antenna (With Vendor Board) > black (dashed)

WLAN band is more influenced by Vendor pcb than GSM band




Full System Simulations

Phi=0 > Red

Phi=90 > Blue

The Meter Assembly acts as a ground and

increases Directivity in opposite direction

Proprietary

Far-field Plot




Synapse Wearable

Electronics




Predict With Confidence…

New Opportunities

Synapse uses ANSYS solutions to evaluate the performance of

antenna designs and the interactions with the human body.

Designing Safe And Robust Wearable

Wireless Devices without Building

Prototypes




RF near the body

• Absorption due to human

body

• Comfort & size = movement

– S11 match shifts due to the

influence of the body

– Efficiency changes

• Body movement

– Rotations causes gain variation

– Generally hurts the link budget

HUMAN BODY IMPLICATIONS

Bottom Right: S11

variation due to

movement

Top Right: Model of an

oscillating wrist Courtesy

Mike Schaff, Synapse




850 MHz 1900 MHz 2400 MHz

.85 GHz 1.85 GHz

Current Distribution on Antenna

Elements

Watch Performance on Human

Hand

Courtesy Mike Schaaf, Synapse

Case Study:

Smart Watch Design




Current Distribution on Antenna Elements

2.4 GHz

.85 GHz

1.85 GHz

“Simple” Triple Monopole Design



Inventory #002593 © 2014 ANSYS, Inc. December 12, 2014 34 © 2014 ANSYS, Inc. December 12, 2014

Crack in the LCD Display from Impact




Electrolux Washing

Machine


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• Electrolux washing machine – ANSYS channel partner ESSS,

Brazil

• System Simulation for Regulatory Compliance – Real circuits drive 3D physics

• EMI Compliance

• WiFi

Electrolux Washing Machine


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Electrolux Washing Machine

Controller PCB

• Controller PCB Behind Control Panel

• Connects to prime power and provides motor drive


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Radiated Emissions


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Electrical Signals Pushed into 3D Fields


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Adding WiFi to Control Board


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• Advanced simulation has a large role to play for IoT device design

– Explore new ideas on the computer

– Examine electrical, thermal, mechanical effects

• Important to include real-world effects

– Printed circuit boards, antennas, cables

– Interaction with human body for wearables

– Complex 3D environments

Conclusion


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Thank You!

Dr. Larry Williams

[email protected]

Simulation Advances for IoT Devices and Infrastructure...

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