CST Installed Performance
Transcript of CST Installed Performance
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Modeling the InstalledPerformance of Antennas in a
Ship Topside Environment
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Enow Tanjong
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Electromagnetic SystemsComplete Technology in Action
Antenna
Filter Shielding
RCS
Installed Performance
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Electron Tube
FSS
Array
Connectors PCB
Package
Cabling
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System Level Design
All-Encompassing EM-Simulation
EM Interaction
System analysis
Coupling analysisRadiation analysis
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Installed PerformanceEMC/ EMI/ E3
Challenges: Electromagnetic size, Complexity, Aspect ratio
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Electrical SizeFrequency Application
1 MHz Lightning
10 MHz HF communications
100 MHz EMP
1 GHz L-Band
Communications
10 GHz Radar
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El. Length
0.5
5
50
500
5000
FEM TD MLFMM AsymptoticMoM
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Aspect Ratio
300 MHz
18 m
18
1.575 GHz
160 m
840
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4 mm notches
0.9 mm radius feed pin3 mm wire radii
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Approach 1: Brute force!
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Small detail small time step longer simulation.
HPC options: CPU, GPU, MPI.
Mesh quality important Increased meshing in small
detail leads to high memory
requirement
HPC options: CPU, MPI.
MLFMMTime Domain
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Approach 2: Field DecompositionFIT, TLM, FEM, MoM, MLFMM
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Near-field source
Far-field source
FIT, TLM
MoM ,MLFMM, Asymptotic
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Advantages of Field Sources
Near-field Source Far-field Source
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Small simulation volume fine features can be simulated
accurately.
Simulate source with appropriate mesh and solver.
Can import external (measured) fields.
No knowledge of antenna structure necessary (Intellectual Property).
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Real World Navy Frigate
Complete Technology in Action
1 GHz JTIDS antenna(FEM + MLFMM)
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10 MHz HF whips (TD, MoM)
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TD (FIT) Solution
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FIT Solver
40 minutes, 1.3 GB RAM10 Million mesh cells
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Far-Field Results at 10 MHz
Single antenna excited
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Surface Current due to HF Antenna
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MoM SolutionMoM Solver
60 minutes, 12 GB RAM
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Low frequency stabilization available
Anisotropic mesh
refinement
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JTIDS for L Band TDMA Network RadioJTIDS antenna (1.0875 GHz)
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Installed performance of antenna required
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JTIDS Antenna Array Design
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Rapid, automaticdesign of validatedantenna elements
Convenientbuilding block forlarger, morecomplex designs
Synthesis, Optimization
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Element Level Simulation
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Snap nodes to boundaryReferences true geometry
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Sensitivity Analysis
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Sensitivity AnalysisParametric tolerance analysis with only a single simulation run
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2nd Order325000 Tetrahedrons
Mixed Order Elements
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3rd Order Mixed98000 Tetrahedrons
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JTIDS Antenna Pattern in Isolation
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Automatic phasecenter calculation
Arbitrary slantpolarization
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JTIDS Far Field Source on Ship
JTIDS antenna patternimported and
positioned on ship mast
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Ship is 500 wavelengths long @ 1.0875 GHz
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Characterization of Water Surface
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At higher frequencies
characterization of sea water as asurface impedance materialsignificantly reduces the amount ofrequired computational resources
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Surface Mesh at 1.0875 GHz
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, , sur aces
MLFMM Solver => 12 hours and ~84 GB RAM
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JTIDS + Ship Results at 1.0875 GHzSurface current
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Complex Ship Model
USS Winston S. Churchill (DDG-81)
Provided by
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Tactical Air Navigation (TACAN) Antenna
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1.087 GHz TACAN antennaGain cut
3D Far-field
Antenna Gain not optimized
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TACAN AntennaGain
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TACAN Far Field Source on Ship
TACAN antenna patternimported and positioned
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TACAN Far Field + Ship meshed at 1.087 GHz
1,950,098 surfaces (including seawater) => Solvable with MLFMM
but would require a large amountof RAM. MPI would be an option
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Asymptotic SolutionShooting Bouncing Ray (SBR) method Multiple bounces taken into account Plane wave source for RCS analysis Incident Rays
Scattered Rays
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Robust meshing enables discretization of complex models and Asymptotic solutionrequires far less computational resources making it ideal for this problem
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TACAN + Ship Results at 1.087 GHz
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Asymptotic solver => 3 hours, 600 MB RAM
Model size is approximately 783 wavelengths at 1.087 GHz
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S-Band Radar Antenna
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Radar Unit Element Patch Antenna
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Right-hand Circular Polarized pin-fed
Square Truncated Patch Antennadesigned for 3 GHz
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Array Construction and Excitation
Array wizard constructsthe array and applies
excitation
25 X 25 Array
Transient Solver
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All 625 Ports created
automatically by wizard
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3 GHz S-Band Radar Array Results
Far-field
Surface Current
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Simultaneous port excitation requiring 35 GB ofRAM and 6 hours to run
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S-band Radar Antenna Field source on Ship
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Radar Antenna Array Patternimported and Positioned
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Single Radar + Ship Results at 3 GHz
Far-field
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Model size is approximately 2160 wavelengths at 3 GHz
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Multiple Far-Field Sources
Possible to import multiple FFsources and excite all at once
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Antenna Analysis/Placement Features
All standard antenna performance results (Gain, Surface Current, . . )
Sensitivity analysis
Up to 3rd order TET elements
Frequency tabulated surface impedance
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arame er za on op m za on
Far-field and Near-field Source imports
Array Wizard
High Performance Computing Options
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Summary
CST MWS has the capability of solving electromagnetic problems both
at the component level and at the system level
The complete technology available means the best tool can be used for
a particular analysis
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e sys em eve e ecompos on ec n ques can e use or
more efficient analysis.
The asymptotic method implemented in CST MWS can be used for very
complex electrically large simulations reduce the amount of resources
required