April Meeting Notice, Santa Clara Valley IEEE EMC Society
When
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April 13, 1999
Where
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Dinner 5:30 - 7:30 PM
Auspex Cafeteria, 2300 Central Expressway, Buliding A, Santa Clara
Technical Presentation 7:30 - 9:30 PM
Auspex, 2300 Central Expressway, Building A, Santa Clara, CA
Topic
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"Solving Real World EMC Problems using the FDTD Modeling Code"
Dr. Gary Haussmann, Silicon Graphics Inc.
Where
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7:30 pm - 9:30 pm, Auspex, 2300 Central Expressway, Bldg. A, Santa Clara
Summary/Biography
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Finite Difference Time Domain (FDTD) is becoming one of the most popular
electromagnetic modeling techniques. The major advantages of the FDTD method
include: time domain transient analysis that are useful for solving signal
integrity and high speed interconnect problems; animations of the overall
electrodynamic performance of structures that provide a greater visual
understanding of the physics underlying the problem; and finally, by taking the
Fourier transform of the time-domain results, one can readily obtain the
frequency domain response using only one simulation.
The FDTD method is an explicit numerical solver for modeling vector
electromagnetic wave phenomena by direct integration of Maxwell's two
time-dependent curl equations. In the FDTD method, the spacial derivatives of
the curl are implemented using finite difference equations in a Cartesian space
mesh. The spacial and time derivatives are then implemented on a computer using
a leapfrog time-space integration scheme. Using this scheme, the E-fields and
H-fields are found throughout the entire analysis region at each time step.
Once the fields are found, secondary values such as voltage, current, charge,
electric and magnetic flux, power density, impedance, capacitance, inductance,
S-parameters, and far field radiation patterns can be obtained.
The presentation will cover how the FDTD method works, and how it can be
effectively used to solve real world EMC problems ranging from time-domain
signal integrity problems commonly found in high speed circuit design to the
more traditional frequency-domain EMC problems associated with enclosure and
printed circuit board resonances, radiation through apertures, and crosstalk.
Dr. Gary Haussmann received his B.S., M.S., and Ph.D. in Electrical Engineering
from the University of Colorado at Boulder. During his graduate work he
specialized in numerical simulation and scientific visualization associated
with electromagnetics analysis. Prior to joining the Silicon Graphics EMC
group, he worked at Cray Research developing explicitly parallel schemes of the
FDTD method for distributed memory parallel computers such as the Cray T3E.
His current interest include the application of the FDTD method to EMC
problems, 3D visualization, numerical optimization, and the Perfectly Matched
Layer (PML) as a solution to FDTD boundary conditions.
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