| Presentation | 2004/6/24 Theoretical and Experimental Study for the Influence of the Reference Plate Curvature in Free Space Method Takahiro AOYAGI, Akihiko SAITO, Atsuhiro NISHIKATA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A free space method is frequently used to measure characteristics of the electromagnetic wave absorbers. In this report, influences of a curvature of the reference plate that affects the measured characteristics are studied. At first, reflection coefficients of 2mm-thick iron plate and 5mm-thick iron plate were measured under a lot of conditions (orientation of the plates, incident angle and incident polarization). As a result, reflection coefficients were in the range from -2.5dB to +1dB for 5GHz-8GHz, though reflection coefficients of the reference plate should be 0dB normally. Reflection coefficients were within ±0.2dB for rotational symmetrical pairs of the iron plate orientation. This result indicates the reproducibility of the experiment results and the reciprocity of the measurement system. Next, height distributions of iron plates were measured using laser distance meter. Roughness of approximately 2-3 mm was observed at the surface of both iron plates. By numerical simulation using physical optics approximation with consideration of measured curvature of iron plates, it was also observed that the reflection coefficients vary according to the orientation of the iron plate. The calculational standard deviations of the reflection coefficients were in good agreement with experiments within shift of 1dB. Finally, theoretical calculations for θ directional pattern of scattered wave were performed. Calculated patterns gave good agreement with measured ones. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Electromagnetic compatibility / wave absorber / free space method / reference plate / curvature / physical optics approximation |
| Paper # | EMCJ2004-28 |
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| Conference Information | |
| Committee | EMCJ |
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| Conference Date | 2004/6/24(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Electromagnetic Compatibility (EMCJ) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Theoretical and Experimental Study for the Influence of the Reference Plate Curvature in Free Space Method |
| Sub Title (in English) | |
| Keyword(1) | Electromagnetic compatibility |
| Keyword(2) | wave absorber |
| Keyword(3) | free space method |
| Keyword(4) | reference plate |
| Keyword(5) | curvature |
| Keyword(6) | physical optics approximation |
| 1st Author's Name | Takahiro AOYAGI |
| 1st Author's Affiliation | Center for R&D of Educational Technology, Tokyo Institute of Technology() |
| 2nd Author's Name | Akihiko SAITO |
| 2nd Author's Affiliation | Research & Development Laboratory, Daido Steel Co., ltd. |
| 3rd Author's Name | Atsuhiro NISHIKATA |
| 3rd Author's Affiliation | Center for R&D of Educational Technology, Tokyo Institute of Technology |
| Date | 2004/6/24 |
| Paper # | EMCJ2004-28 |
| Volume (vol) | vol.104 |
| Number (no) | 151 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |