Login | Register

Calculation of the Shielding Effectiveness of Carbon-Fiber Composite Structures

Title:

Calculation of the Shielding Effectiveness of Carbon-Fiber Composite Structures

Ansarizadeh, Mohammadali (2013) Calculation of the Shielding Effectiveness of Carbon-Fiber Composite Structures. Masters thesis, Concordia University.

[img]
Preview
Text (application/pdf)
Ansarizadeh_MASc_F2013.pdf - Accepted Version
3MB

Abstract

Carbon-fiber composite (CFC) materials are replacing metals in the construction of modern aircraft because of their outstanding strength/weight ratio. The purpose of this thesis is to identify the capabilities and limitations of the commercially available software in calculating the shielding effectiveness (SE) of CFC structures. This work
is started by a literature survey focused on the characterization and modeling of CFC
panels.
The homogenized model of CFC panels is analyzed using the skin-effect approximation in a method of moments (MoM) solution. It is found that the stack-to-sheet
conversion is a limiting factor in the skin effect approximation and not the homogenization scheme.
Experimental results are presented which indicate that performance of monopole antennas up to a frequency of 12.5 GHz is not altered by replacing a metallic ground
plane with a CFC one. Also, a monopole antenna is mounted on hollow CFC and aluminum cubes with the same physical dimensions and the radiated electromagnetic interference (EMI) inside the cube are theoretically compared.
Although wire meshes with unbonded junctions are better shields it is shown that this is less important for meshes is epoxy as compared to free space. For CFC materials reinforced with woven carbon-fiber fabrics the effects of physical contact between orthogonally oriented fiber bundles are examined. It is found that bonding CFC fiber bundles at the junctions actually improves the shielding performance.
The simulation results for the electric and magnetic SE inside a hollow spherical CFC shell are compared with the benchmark analytic solutions. It is shown that the
analytic solutions could not be numerically evaluated unless the wave functions are expressed in terms of the thickness of CFC materials.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering
Item Type:Thesis (Masters)
Authors:Ansarizadeh, Mohammadali
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Electrical and Computer Engineering
Date:11 September 2013
ID Code:977705
Deposited By: MOHAMMAD ANSARIZADEH
Deposited On:18 Nov 2013 17:08
Last Modified:18 Jan 2018 17:45
All items in Spectrum are protected by copyright, with all rights reserved. The use of items is governed by Spectrum's terms of access.

Repository Staff Only: item control page

Downloads per month over past year

Back to top Back to top