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Simulation of Electrically Large
Structures
WIPL-D Pro is a frequency-domain method of
moments (MoM) based code which enables very accurate EM simulation of
arbitrary 3D structures. Owing to application of sophisticated
techniques, such as higher order polynomial basis functions (HOBFs),
very large structures are simulated on PC computers or inexpensive
workstations.
The WIPL-D MoM approach adequately models
a large structure with about ten times less unknowns than other MoM
codes commonly using triangular meshing and Rao-Wilton-Glisson (RWG)
basis functions. This is achieved thanks to the application of HOBFs on
a quad mesh containing electrically small and large elements within the
same model.
However, due to the ever-increasing
electrical sizes (very large scatterers, antenna placement issues,...),
even the most efficient MoM code is not able to meet all the industry
demands without application of special techniques. This is mostly the
case in analysis of EM effects in car, aircraft or ship industry. |
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Multilevel Fast Multipole Method (MLFMM)
MLFMM is applied to the same models
treated by MoM, with no changes to the mesh. Maximally orthogonalized
HOBFs, developed by WIPL-D, and system preconditioning enhance the
convergence of the iterative solution algorithm, making it applicable to
scatterers, antennas, metallic-dielectric structures, etc.
In MoM, interactions between all basis
functions in the model are calculated independently. The MLFMM groups
basis functions. In case when groups are far-apart in the model, it
calculates interactions between groups, rather than between individual
basis functions.
MLFMM is much more scalable then the MoM,
i.e. the memory requirements and length of simulation rise much slower
with electrical size. The method enables WIPL-D Pro to remain the number
one choice for accurate simulation of electrically very large
structures.
learn more...
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Smart Reduction
The special feature intended for antenna
placement problems is “smart reduction”. It is based on adaptive
reduction of current expansion order over parts of the model which are
distant from the antenna or in shadow. This way, the number of unknowns
is reduced 3-10 times, while very good accuracy of calculated radiation
pattern or coupling between multiple antennas is preserved.
In addition, regions of the platform
regarded by the user to be in shadow are additionally treated. Expansion
orders on all patches in shadow are decreased uniformly, in addition to
the distance-to-the-antenna factor.
learn more...
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Order of Magnitude Ahead
New! WIPL-D Pro 7.0
3D Electromagnetic Solver
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