Transcript Overview of Electromagnetics Research

Overview of Electromagnetics
Research
Weng Cho Chew
Director, Center for Computational Electromagnetics
Department of Electrical and Computer Engineering
University of Illinois
Urbana, IL 61801
USA
Dean’s Visit
August 21, 2001
Faculty in the EM Area

Jennifer Bernhard
– Wireless antennas
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Andreas Cangellaris
– EM for circuits
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Weng Chew
– CEM (computational EM), fast algorithms, inverse scattering
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Shun-Lien Chuang
– Optics, lasers
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Jianming Jin
– CEM, bioelectromagnetics, finite elements
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Eric Michielssen
– CEM, fast time-domain solvers, genetic algorithms
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Jose Schutt-Aine
– EM for circuits, computer clusters, computer visulization
Areas of Research
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Computational electromagnetics
Fast algorithms
Inverse scattering and imaging
Genetic algorithms
Computer chip simulation
Antennas, reconfigurable antennas
Wireless communication
Bioelectromagnetics
Subsurface sensing, remote sensing
Radar cross section
Electromagnetic compatibility/electromagnetic
interference
Optoelectronics and lasers
Computer visualization
IMPACT OF ELECTROMAGNETICS
Biomedical
Engineering
& BioTech
Wireless
Comm. &
Propagation
RCS Analysis,
Design, ATR
& Stealth
Technology
Physics Based
Signal
Processing &
Imaging
Computer
Chip Design
& Circuits
ELECTROMAGNETICS
Antenna
Analysis &
Design
EMC/EMI
Analysis
Lasers &
Optoelectronics
MEMS &
Microwave
Engineering
Remote
Sensing &
Subsurface
Sensing & NDE
VFY218 at 3 GHz (W. Chew)
Bistatic RCS of VFY218 at 3 GHz
8 processors of SGI Origin 2000
# of Unknowns N = 2 millions
FISC
LUD
CG
Memory
(GB)
Matrix-fill
(days)
5
32,000
32,000
0.1
600.0
600.0
AZ
LUD One-RHS
(years)
(hrs)
200
9
4
500
83 Camaro at 1 GHz by FISC
(W. Chew)
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Irradiation of a 83 Camaro at 1 GHz by a Hertzian
dipole.
3D Layered Medium Problems
- Numerical Results (W. Chew)
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Underground Bunker
2m
2m
5m
5m
 2r  3.5

z
y
x
inc
 
,  inc  60o , 90o
f = 300MHz
N = 100,314
6 level ML-FIPWA

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)
Radiation patterns
Current distribution
EM Interaction (J. Jin)
Magnetic field
SAR at 171 MHz
EM VFY218: Current distribution (snapshots in
time) (E. Michielssen)
.



Broadband Analysis of Wave Interactions
with Nonlinear Electronic Circuitry
Eexc
20 cm
10 cm
5 cm
kˆ
1 cm
PWTD solvers permit analysis of
wave broadband EMC/EMI
phenomena, and the
assessment of electronic upset
and terrorism scenarios
17.5 cm
6 cm
Voltages on the varistors
0.5 cm
4.5 cm
25 cm
1.5
z
y
line1
line2
line3
1
25 cm
x
0.5
0
-0.5
15 cm
-1
1 cm
500 
500 
y
-1.5
0
2
4
t ( s)
6
8
-3
x 10
Broadband Analysis of Antennas,
Scattering, and Radiation Phenomena
PWTD solvers are used to fully
characterize a 25-88 MHz logperiodic monopole array mounted
on a C-12 aircraft. The array
serves in foilage penetration radar
studies.
Reconfigurable Antennas for Wireless Communication
(Jennifer Bernhard)
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Planar and microstrip
antenna development
– Reconfigurable in frequency,
bandwidth, and/or radiation
pattern
– Linear and circular polarization
– Patch, spiral, sinuous
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For applications in:
– Planar phased arrays and
reflectarrays
– Single element wireless
communication implementations
Courtesy NASA GRC
Prof. Jennifer T. Bernhard, Electromagnetics Laboratory, UIUC ([email protected])
Advanced Electromagnetic Modeling of
Mixed-Signal Systems (A. Cangellaris)
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Objective
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Establish a comprehensive modeling capability with
electromagnetic accuracy and simulation efficiency
necessary for virtual prototyping of multi-functional,
mixed-signal, multi-GHz (digital/RF/microwave/opto electronic) integrated systems
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Impact
 Global modeling and simulation environment that comprehends the temporal and
spatial multi-scale features of mixed-signal, multi-GHz, integrated electronic
subsystems and systems
 Comprehensive electromagnetic modeling at the chip, package, board and system
level
 Enable a universal computer-aided design environment for multi-physics (electrical,
optical, thermal, mechanical) modeling & simulation aimed at the virtual prototyping
of tomorrow’s integrated systems
A.C. Cangellaris’ Research Group: “Modeling from dc to light!”
Advanced Electromagnetic Modeling of
Mixed-Signal Systems (A. Cangellaris)
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Specific Research Tasks
a)
b)
c)
d)
e)
f)
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Electromagnetic (EM) modeling of on- and off-chip electronic and optical interconnects
EM modeling of passive digital/RF/microwave signal processing components (filters, couplers,
power dividers, etc.) integrated in a 3-D substrate
Comprehensive modeling of power distribution networks for mixed-signal systems
Behavioral modeling of non-linear digital, analog/RF, and optical devices
Methodologies for EM complexity abstraction and model order reduction that lead to compact
and accurate macro-models for complex EM and opto-electronic devices and functional blocks
Methodologies for the incorporation of EM macro-models in a universal, state space- based,
non-linear simulation environment
Sponsors
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DARPA (Automated Design Tools for Integrated Mixed-Signal Microsystems-NEOCAD)
Intel, Motorola, IBM, Texas Instruments, Semiconductor Research Corporation
NSF
Army Research Office (MURI Program on Quasi-Optical Power Combining Systems)
A.C. Cangellaris’ Research Group: “Modeling from dc to light!”
Optical Communication
(S. Chuang)
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The exploding demand for Internet access,
telecommunications, and broadband services has led to a push
for greater lightwave transmission capacity.
– Optical fiber networks now carry a large amount of voice and
data traffic all over the world.
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Improving the high-speed performance of semiconductor lasers
benefits the telecommunication industry and society.
Laser
Modulated
optical signal
Photodetector
Fiber cable
Electrical
data source
Location 1
Transmitter
(Installed on land,
under the ocean, and in
the walls of buildings)
Electrical
data recovered
Receiver
Location 2
Four-channel Wavelength Division
Multiplexing (WDM) integrated laser source (S.
Chuang)
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Optical amplifier
s-bends
Star coupler
Electroabsorption
Distributed-feedback
modulator
lasers
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This device consists of four
wavelength-tunable three-electrode
DFB lasers which are coupled into a
single waveguide, optical amplifier,
and modulator.
Professor S. L. Chuang’s group
conducts research on high-speed
semiconductor optoelectronic
devices, fiber optics, and optical
transmission characteristics. Both
theory and experiment are
researched.