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"metadata_visibility": "show", "creators": { "items": [ { "id": "Mendez-Horacio-Augusto", "name": { "family": "Mendez", "given": "Horacio Augusto" }, "show_email": "NO" } ] }, "title": "Shielding Theory of Enclosures with Apertures", "ispublished": "unpub", "full_text_status": "public", "keywords": "Electrical Engineering", "abstract": "
Present methods for computing the shielding efficiency of metallic plates with apertures are based on the analysis of a plane wave incident on an infinite conducting sheet. When applied to actual enclosures with internal radiation sources, these methods lose all validity, and obviously fail to predict the measured results. Semi-empirical formulas are available for special cases,\r\nbut no serious analytic investigation has ever been conducted.
\r\n\r\nThis dissertation develops the theory of electromaqnetic radiation from metallic enclosures with apertures, excited by an internal source at frequencies below the fundamental resonance\r\nof the enclosure.
\r\n\r\nThe enclosure with an aperture is analyzed from two different points of view: as a cavity with a small aperture in a wall; and as a waveguide section short-circuited at one end and open at the\r\nother end.
\r\n\r\nRectangular geometries are used throughout, since these are by far the most commonly encountered in practical enclosures and cabinets.
\r\n\r\nUsing the corresponding dyadic Green's functions, the fields generated inside the enclosure by some simple sources are determined. In addition to the case of a Hertzian dipole - the building block for more complicated sources - a center-fed dipole and a square loop antenna are analyzed. The fields radiated through small apertures in a cavity are determined using Bethe's theory of diffraction by small holes. The radiation from an open waveguide is calculated with the help of field equivalence theorems, with assumptions applicable to the case of evanescent waves.
\r\n\r\nThe final step is to derive expressions for the \"Insertion Loss\" of the shield, defined as the ratio of the field strength at a point external to the shield, before and after the insertion\r\nof the enclosure. To accomplish this, the effect of the shield upon the input impedance of the antenna is analyzed, and expressions obtained for the applicable cases.
\r\n\r\nThe resulting insertion loss expressions are numerically evaluated for some representative cases, and graphically compared with a series of measurements performed to obtain experimental\r\nconfirmation. Very good agreement is obtained in all cases, establishing the validity of the analysis.
\r\n\r\nThus, this work provides accurate prediction capabilities for the design of shielded enclosures with apertures, in the presence of internal or external noise sources (the latter is a consequence\r\nof applying the reciprocity theorem). Hence, it constitutes a useful tool in the solution of electromagnetic interference and susceptibility problems.
", "date": "1974", "date_type": "degree", "id_number": "CaltechTHESIS:10192017-142731943", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:10192017-142731943", "related_url": { "items": [ { "description": "Thesis Published as Caltech Antenna Laboratory Technical Reports 68", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20171019-145953395" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "9768-02" }, { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "61102F" }, { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "681305" }, { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "70-1935" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "other_numbering_system": { "items": [ { "id": "68", "name": "Caltech Antenna Laboratory Technical Reports" }, { "id": "74-0100", "name": "AFOSR TR" } ] }, "local_group": { "items": [ "Caltech Antenna Laboratory" ] }, "deposited_by": "Kathy Johnson", "deposited_on": "2017-10-19 21:59:24", "doi": "10.7907/Z9KW5D7F", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Papas-C-H", "name": { "family": "Papas", "given": "Charles Herach" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1973-12-04", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "pub_year": "1974", "author_list": "Mendez, Horacio Augusto" } ]