ACES Publication Search
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| Title: | ACES September 2008 Full Newsletter |
| File Type: | Newsletter Paper |
| Issue: | Volume: 23 Number: 2 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 9983 KB |
| Title: | ACES September 2008 About ACES |
| File Type: | Newsletter Paper |
| Issue: | Volume: 23 Number: 2 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 1756 KB |
| Title: | ACES September 2008 ACES News |
| File Type: | Newsletter Paper |
| Issue: | Volume: 23 Number: 2 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 1102 KB |
| Title: | ACES September 2008 ACES Notices |
| File Type: | Newsletter Paper |
| Issue: | Volume: 23 Number: 2 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 297 KB |
| Title: | ACES September 2008 ACES Publication Updates |
| File Type: | Newsletter Paper |
| Issue: | Volume: 23 Number: 2 Year: 2008 |
| Download Link: | Click here to download PDF File Size: 431 KB |
| 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 |
| Download Link: | Click here to download PDF File Size: 746 KB |
| 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 |