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Title: ACES September 2008 Full Newsletter
File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
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Title: ACES September 2008 About ACES
File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
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Title: ACES September 2008 ACES News
File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
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Title: ACES September 2008 ACES Notices
File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
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Title: ACES September 2008 ACES Publication Updates
File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
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Title: Electromagnetic Field Shielding of a Spherical Shell Revisited
Abstract: This paper takes a fresh look at two classical EM shielding problems involving an integral imperfectly conducting spherical shell and a perfectly conducting hollow sphere with an aperture. Previous studies of the EM shielding provided by these objects have concentrated on evaluating the E- and H-fields at the center of the shield, where only one term of the spherical wave function expansion is needed. While the internal H-field in the shielded volume of the conducting shell is very close to being constant, the same is not true for the E-field, where there can be a significant variation in the E-field intensity from point to point within the interior. For both of these canonical shielding problems, the method of analysis is described and then applied to determine cumulative probability distributions for the internal fields. In Part 1 of this paper, the frequency-dependent analysis for the case of the complete shell is discussed. To avoid certain numerical overflow problems in evaluating the spherical harmonic solution for lossy media, the use of scaled Hankel functions is described. Additionally, closedform expressions for the wave expansion coefficients in the spherical coordinate system are derived. In Part 2 of this paper, the treatment of the hollow sphere with an aperture is obtained using a quasi-static model that also permits the determination of the E-fields anywhere in and around the sphere.
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File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
Download Link:Click here to download PDF     File Size: 3150 KB

Title: ACES September 2008 Front and Back Matter
File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
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Title: ACES September 2008 Editors Comments
File Type: Newsletter Paper
Issue:Volume: 23      Number: 2      Year: 2008
Download Link:Click here to download PDF     File Size: 282 KB