Longer-Term Coupling Analysis Pieces - PowerPoint PPT Presentation

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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
• 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
• 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