Overview of Electromagnetics Research

Weng Cho ChewWeng Cho Chew

Director, Center for Computational ElectromagneticsDirector, Center for Computational Electromagnetics

Department of Electrical and Computer EngineeringDepartment of Electrical and Computer EngineeringUniversity of IllinoisUniversity of Illinois

Urbana, IL 61801Urbana, IL 61801USAUSA

Dean’s VisitDean’s Visit

August 21, 2001August 21, 2001

Faculty in the EM Area

Jennifer BernhardJennifer Bernhard– Wireless antennasWireless antennas

Andreas CangellarisAndreas Cangellaris– EM for circuitsEM for circuits

Weng ChewWeng Chew– CEM (computational EM), fast algorithms, inverse scatteringCEM (computational EM), fast algorithms, inverse scattering

Shun-Lien ChuangShun-Lien Chuang– Optics, lasersOptics, lasers

Jianming JinJianming Jin– CEM, bioelectromagnetics, finite elementsCEM, bioelectromagnetics, finite elements

Eric MichielssenEric Michielssen– CEM, fast time-domain solvers, genetic algorithmsCEM, fast time-domain solvers, genetic algorithms

Jose Schutt-AineJose Schutt-Aine– EM for circuits, computer clusters, computer visulizationEM for circuits, computer clusters, computer visulization

Areas of Research

Computational electromagneticsComputational electromagnetics Fast algorithmsFast algorithms Inverse scattering and imagingInverse scattering and imaging Genetic algorithmsGenetic algorithms Computer chip simulationComputer chip simulation Antennas, reconfigurable antennasAntennas, reconfigurable antennas Wireless communicationWireless communication BioelectromagneticsBioelectromagnetics Subsurface sensing, remote sensingSubsurface sensing, remote sensing Radar cross sectionRadar cross section Electromagnetic compatibility/electromagnetic Electromagnetic compatibility/electromagnetic

interferenceinterference Optoelectronics and lasersOptoelectronics and lasers Computer visualizationComputer visualization

IMPACT OF ELECTROMAGNETICSIMPACT OF ELECTROMAGNETICSIMPACT OF ELECTROMAGNETICSIMPACT OF ELECTROMAGNETICS

ELECTRO-ELECTRO-MAGNETICSMAGNETICS

BiomedicalEngineering& BioTech

WirelessComm. &Propagation

Physics BasedSignalProcessing &Imaging

ComputerChip Design& Circuits

Lasers &Optoelectronics

MEMS &MicrowaveEngineering

RCS Analysis,Design, ATR& StealthTechnology

AntennaAnalysis &Design

EMC/EMIAnalysis

RemoteSensing &SubsurfaceSensing & NDE

VFY218 at 3 GHz (W. Chew)

Bistatic RCS of VFY218 at 3 GHz8 processors of SGI Origin 2000# of Unknowns N = 2 millions

FISCLUDCG

Memory Matrix-fill LUD One-RHS (GB) (days) (years) (hrs)

5 0.1 932,000 600.0 200 432,000 600.0 500

AZ

83 Camaro at 1 GHz by FISC (W. Chew)

Irradiation of a 83 Camaro at 1 GHz by a Hertzian Irradiation of a 83 Camaro at 1 GHz by a Hertzian dipole.dipole.

3D Layered Medium Problems 3D Layered Medium Problems

- Numerical Results (W. Chew)- Numerical Results (W. Chew) Underground BunkerUnderground Bunker

f = 300MHzf = 300MHzN = 100,314N = 100,3146 level ML-6 level ML-FIPWAFIPWA

, 60 , 90inc inc o o

2m

5m5m

2m

zxy

2 3.5r

Luneburg Lens – Scattering (J. Jin)

Inlet Scattering (J. Jin)

Simulation Measurement

> 2,000,000 unknowns

Corrugated Horn Antenna (J. Jin)

Corporate-Fed Antenna Array (J. Jin)

Current distribution

Radiation patterns

EM Interaction (J. Jin)

Magnetic field

SAR at 171 MHz

EM VFY218: Current distribution (snapshots in time) (E. Michielssen)

.

25 cm

25 cm

5 cm

17.5 cm

10 cm

1 cm

20 cm

4.5 cm6 cm

xy

z

Broadband Analysis of Wave Interactions with Nonlinear Electronic Circuitry

k̂

excE

0.5 cm

15 cm

1 cm

y

500 500 500 500

Voltages on the varistors

0 2 4 6 8x 10

-3

-1.5

-1

-0.5

0

0.5

1

1.5line1line2line3

Vo l

t ag e

(kV

)

( )t s

PWTD solvers permit analysis of wave broadband EMC/EMI phenomena, and the assessment of electronic upset and terrorism scenarios

PWTD solvers are used to fully characterize a 25-88 MHz log-periodic monopole array mounted on a C-12 aircraft. The array serves in foilage penetration radar studies.

Broadband Analysis of Antennas, Scattering, and Radiation Phenomena

Prof. Jennifer T. Bernhard, Electromagnetics Laboratory, UIUC (jbernhar@uiuc.edu)

Reconfigurable Antennas for Wireless Communication(Jennifer Bernhard)

Planar and microstrip Planar and microstrip antenna development antenna development

– Reconfigurable in frequency, Reconfigurable in frequency, bandwidth, and/or radiation bandwidth, and/or radiation patternpattern

– Linear and circular polarizationLinear and circular polarization

– Patch, spiral, sinuousPatch, spiral, sinuous

For applications in:For applications in:– Planar phased arrays and Planar phased arrays and

reflectarraysreflectarrays

– Single element wireless Single element wireless communication implementationscommunication implementations

Courtesy NASA GRC

Advanced Electromagnetic Modeling of Mixed-Signal Systems (A.

Cangellaris) ObjectiveObjective Establish a comprehensive modeling capability with Establish a comprehensive modeling capability with

electromagnetic accuracy and simulation efficiency electromagnetic accuracy and simulation efficiency necessary for virtual prototyping of multi-functional, necessary for virtual prototyping of multi-functional, mixed-signal, multi-GHz (digital/RF/microwave/opto -mixed-signal, multi-GHz (digital/RF/microwave/opto -electronic) integrated systemselectronic) integrated systems

ImpactImpact Global modeling and simulation environment that comprehends the temporal and Global modeling and simulation environment that comprehends the temporal and

spatial multi-scale features of mixed-signal, multi-GHz, integrated electronic spatial multi-scale features of mixed-signal, multi-GHz, integrated electronic subsystems and systemssubsystems and systems

Comprehensive electromagnetic modeling at the chip, package, board and system Comprehensive electromagnetic modeling at the chip, package, board and system levellevel

Enable a universal computer-aided design environment for multi-physics (electrical, Enable a universal computer-aided design environment for multi-physics (electrical, optical, thermal, mechanical) modeling & simulation aimed at the virtual prototyping optical, thermal, mechanical) modeling & simulation aimed at the virtual prototyping of tomorrow’s integrated systemsof tomorrow’s integrated systemsA.C. Cangellaris’ Research Group: “Modeling from dc to light!”“Modeling from dc to light!”

Specific Research TasksSpecific Research Tasks a)a) Electromagnetic (EM) modeling of on- and off-chip electronic and optical interconnectsElectromagnetic (EM) modeling of on- and off-chip electronic and optical interconnects

b)b) EM modeling of passive digital/RF/microwave signal processing components (filters, couplers, EM modeling of passive digital/RF/microwave signal processing components (filters, couplers, power dividers, etc.) integrated in a 3-D substratepower dividers, etc.) integrated in a 3-D substrate

c)c) Comprehensive modeling of power distribution networks for mixed-signal systemsComprehensive modeling of power distribution networks for mixed-signal systems

d)d) Behavioral modelingBehavioral modeling of non-linear digital, analog/RF, and optical devices of non-linear digital, analog/RF, and optical devices

e)e) Methodologies for Methodologies for EM complexity abstractionEM complexity abstraction and and model order reductionmodel order reduction that lead to compact that lead to compact and accurate and accurate macro-modelsmacro-models for complex EM and opto-electronic devices and functional blocks for complex EM and opto-electronic devices and functional blocks

f)f) Methodologies for the incorporation of EM macro-models in a Methodologies for the incorporation of EM macro-models in a universal, state space- based, universal, state space- based, non-linear simulation environmentnon-linear simulation environment

SponsorsSponsors DARPA (Automated Design Tools for Integrated Mixed-Signal Microsystems-NEOCAD)DARPA (Automated Design Tools for Integrated Mixed-Signal Microsystems-NEOCAD) Intel, Motorola, IBM, Texas Instruments, Semiconductor Research CorporationIntel, Motorola, IBM, Texas Instruments, Semiconductor Research Corporation NSFNSF Army Research Office (MURI Program on Quasi-Optical Power Combining Systems)Army Research Office (MURI Program on Quasi-Optical Power Combining Systems)

Advanced Electromagnetic Modeling of Mixed-Signal Systems (A.

Cangellaris)

A.C. Cangellaris’ Research Group: “Modeling from dc to light!”“Modeling from dc to light!”

Optical Communication (S.

Chuang) The exploding demand for Internet access, The exploding demand for Internet access,

telecommunications, and broadband services has led to a telecommunications, and broadband services has led to a push for greater lightwave transmission capacity.push for greater lightwave transmission capacity. – Optical fiber networks now carry a large amount of voice and Optical fiber networks now carry a large amount of voice and

data traffic all over the world.data traffic all over the world. Improving the high-speed performance of semiconductor Improving the high-speed performance of semiconductor

lasers benefits the telecommunication industry and society.lasers benefits the telecommunication industry and society.

Transmitter Receiver

Laser

Electrical data source

Photodetector

Electrical data recovered

Fiber cable(Installed on land,

under the ocean, and in the walls of buildings)

Modulated optical signal

Location 2Location 1

Four-channel Wavelength Division Multiplexing (WDM) integrated laser source

(S. Chuang) This device consists of four This device consists of four

wavelength-tunable three-electrode wavelength-tunable three-electrode DFB lasers which are coupled into a DFB lasers which are coupled into a single waveguide, optical amplifier, single waveguide, optical amplifier, and modulator. and modulator.

Professor S. L. Chuang’s group Professor S. L. Chuang’s group conducts research on high-speed conducts research on high-speed semiconductor optoelectronic semiconductor optoelectronic devices, fiber optics, and optical devices, fiber optics, and optical transmission characteristics. Both transmission characteristics. Both theory and experiment are theory and experiment are researched.researched.

Distributed-feedbacklasers

Electroabsorptionmodulator

s-bends

Star coupler

Optical amplifier