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Longer-Term Coupling Analysis Pieces

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Longer-Term Coupling Analysis Pieces (Twelve to Twenty-Four Months) Develop Understanding of Complex Coupling Incorporate into Topological Models – PowerPoint PPT presentation

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Title: Longer-Term Coupling Analysis Pieces


1
Longer-Term Coupling Analysis Pieces
(Twelve to Twenty-Four Months)
  • Develop Understanding of Complex Coupling
  • Incorporate into Topological Models
  • Validate Simpler Topological Models

2
Long-Term Problems Nested Boxes with Slots and
Wires
  • Develop understanding of complex coupling
  • Boxes with wires and slots
  • Nested boxes with wires and slots
  • Coupled boxes with wires and apertures
  • Embed pieces in topological structures

3
Wire thru Hole in Box with Interior Feature
4
Nested Boxes with Wire thru Holes
5
Alternate Wire Route Slotted Box
6
Multiple Boxes in Box with Wire
7
Multiple Boxes, Slotted Boxes, Wire through Walls
8
Rectangular Cavity Coupled to Coaxial Cavity via
Wire in Hole
9
Coupled Cavities Rectangular-Coaxial-Rectangular
10
Long-Term Problems Covered (Shielded) Apertures
  • Develop understanding of shielded apertures
  • Slot in screen covered by grounded shield
  • Slot in upper plate of parallel plate guide
    covered by covered by grounded shield
  • Embed in topological structure

11
Shielded Slot in Screen
12
Shielded Slot in Plate of Guide
13
Long-Term Problems Fast Time-Domain Methods
Development
  • Fast time-domain integral equation methods for
    inhomogeneous material regions
  • Accurate TDIE for weak penetration through
    apertures

14
Proposed Effort (Year 1) Algorithms and
Implementations
  • Develop low frequency stable PWTD / TDIE
    solver (12 mo)
  • Hybridize loop/star/tree and time Galerkin
    schemes (Industry strength implementation)
  • Develop stable/accurate TDIE solvers for
    cavities with very small holes / seams / cracks
    (18 mo).

15
Proposed Effort (Year 1) Demonstration of
Capabilities
  • Analyze coupling into a nonlinear circuit
    (amplifier) in a realistic enclosure (12 mo)
  • Geometry Slots, cavities, pins, nonlinear
    circuitry.
  • Demonstrates all capabilities of solver
  • Validation through comparison to FDTD solution.

cavity
slot
circuitry
boards pins
16
Long-Term Problems Fast Frequency-Domain Methods
Development
  • Fast frequency-domain integral equation methods
    for exterior-to-interior coupling problem
  • Fast frequency-domain integral equation methods
    for very low frequencies (for FFT)
  • Fast hybrid methods
  • Accurate fast frequency-domain integral equation
    methods for weak penetration through apertures

17
EMI Threat to Aircraft Systems
Picture from NASA-Langley
External Threat
  • Coupling from other Aircraft Systems
  • Natural Environmental Effects
  • (Lightening, Static Electricity)
  • Man Made Sources External to the aircraft
  • (High Intensity Radiated Fields - HIRF)

Internal Threat
  • Portable Electronic Devices (PEDS) carried by
    passengers

18
Penetration through Loaded Slots with Wire Bundles
  • Adapt hybrid frequency domain methods for
    coupling characterization in presence of wire
    bundles through loaded geometries
  • Develop an understanding of good shielding
    practices and relative levels of penetration
    among the various slots geometries
  • Develop methods for equivalent circuit extraction

19
Coupling through Antennas
  • Antennas are doors to coupling from external
    excitations into structures
  • For coupling studies, details such as wires, feed
    structures and loading are crucial
  • Provide an understanding of coupling (in-band and
    out of band)

20
Coupling though Slots in Loaded Structure
  • Develop general purpose frequency domain
    techniques for coupling into loaded geometries
  • Develop hybrid methods appropriate to structure
    and material finite element method, integral
    equations with multilayer Greens functions, and
    fast multipole integral methods
  • Validate and compare

21
Long-Term Problems Application of EIGER
  • Analysis of complex coupling problems
  • Use as a check on more problem-specific analyses
  • Coupling to PC board traces, for example

22
Aperture Coupling to PCB Traces
  • Analysis should include mutual coupling effects
    between traces.
  • Requires efficient layered-media periodic
    Greens function (Ewald acceleration, etc.).

23
Cable Coupling to PCB Traces
  • Analysis should account for cable propagation to
    traces.
  • Analysis should also account for aperture/cable
    radiation effects.

24
Coupling to PCB Traces
  • Thevenin equivalent circuits can be obtained to
    model both aperture and cable penetration.
  • Thevenin equivalent circuits model all EM
    effects up to the IC pin.
  • This allows for convenient de-coupling between
    EM analysis and IC analysis.
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