You are here

FAU Collections » FAU Research Repository » FAU Theses and Dissertations

Studies on composite media as electromagnetic interference (EMI) shielding materials

Download pdf | Full Screen View

Date Issued:
1994
Summary:
This thesis addresses pertinent studies concerning the use of electromagnetic composite media as EMI shielding materials. Specifically biphasic composites constituted by conducting and/or lossy inclusions dispersed in a dielectric host are considered. The effects of conductivity and/or dielectric loss, shape, size and volume fraction of the included component in deciding the shielding effectiveness of the composite material are ascertained over radio frequency spectrum. Theoretical studies in modeling the effective complex permittivity of the test composite are presented in the classical and state-of-the-art perspectives and hence the shielding effectiveness of the test composite is elucidated. The theoretical considerations also refer to two types of inclusions namely, conducting particulates (metallic particles, fibers and flakes), and lossy nonmetallic inclusions. In the first case the host-inclusions system refers to polemically opposite constituents and in the later case, it is simply a dielectric-dielectric mixture. Experimental studies to evaluate the shielding effectiveness of a set of test composite are presented. Relevant descriptions include details on the test composites synthesized, experimental arrangement and the test procedure followed. Particulars on test materials constituted by a host ceramic medium (such as TiO2) with conducting inclusions such as iron particles, copper rods and aluminum flakes are presented. Measured results on the shielding effectiveness of these materials over the frequency range (200 to 1500 MHz) are listed and compared with theoretical results. Conclusions and discussions as regard to pertinent applications of such materials are presented.
Title: Studies on composite media as electromagnetic interference (EMI) shielding materials.
74 views
21 downloads
Name(s): Iyer, Viswanathan R.
Florida Atlantic University, Degree grantor
Ungvichian, Vichate, Thesis advisor
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Issuance: monographic
Date Issued: 1994
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 134 p.
Language(s): English
Summary: This thesis addresses pertinent studies concerning the use of electromagnetic composite media as EMI shielding materials. Specifically biphasic composites constituted by conducting and/or lossy inclusions dispersed in a dielectric host are considered. The effects of conductivity and/or dielectric loss, shape, size and volume fraction of the included component in deciding the shielding effectiveness of the composite material are ascertained over radio frequency spectrum. Theoretical studies in modeling the effective complex permittivity of the test composite are presented in the classical and state-of-the-art perspectives and hence the shielding effectiveness of the test composite is elucidated. The theoretical considerations also refer to two types of inclusions namely, conducting particulates (metallic particles, fibers and flakes), and lossy nonmetallic inclusions. In the first case the host-inclusions system refers to polemically opposite constituents and in the later case, it is simply a dielectric-dielectric mixture. Experimental studies to evaluate the shielding effectiveness of a set of test composite are presented. Relevant descriptions include details on the test composites synthesized, experimental arrangement and the test procedure followed. Particulars on test materials constituted by a host ceramic medium (such as TiO2) with conducting inclusions such as iron particles, copper rods and aluminum flakes are presented. Measured results on the shielding effectiveness of these materials over the frequency range (200 to 1500 MHz) are listed and compared with theoretical results. Conclusions and discussions as regard to pertinent applications of such materials are presented.
Identifier: 15013 (digitool), FADT15013 (IID), fau:11791 (fedora)
Collection: FAU Electronic Theses and Dissertations Collection
Note(s): College of Engineering and Computer Science
Thesis (M.S.E.)--Florida Atlantic University, 1994.
Subject(s): Electromagnetic interference
Shielding (Electricity)
Radio--Interference
Held by: Florida Atlantic University Libraries
Persistent Link to This Record: http://purl.flvc.org/fcla/dt/15013
Sublocation: Digital Library
Use and Reproduction: Copyright © is held by the author, with permission granted to Florida Atlantic University to digitize, archive and distribute this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.