| Presentation | 2011-12-09 Simulations for site VSWR with consideration of diffracted wave of pyramidal electromagnetic wave absorber Takahiro AOYAGI, Hiroshi KURIHARA, Koji TAKIZAWA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | It is known that reflected wave from an electromagnetic wave absorber on a wall of an anechoic chamber includes higher-mode diffracted waves. Our research group have studied about higher mode diffracted wave from pyramidal wave absorber by measurements and simulations. Meanwhile, an evaluation method for anechoic chambers is defined by the CISPR16-1-4 Ed.3 standard. In this method, several factors affect measured SVSWRs. These are frequency step, antenna directivity, boundary between wave absorber and floor, and so on. There are several reports about the measurement result of the anechoic chambers that the SVSWR values showed higher value at the specific frequencies. In these reports, the authors suspected that these high SVSWR values were caused by antenna directivity or characteristics of wave absorbers. However actual reason has not been found out. We supposed higher mode diffracted wave affect SVSWR measurements. In this report, we calculated higher mode diffracion coefficient from pyramidal wave absorber by FDTD. And we simulated a SVSWR measurement by using these higher mode coeffcients. In the results, we observed that SVSWRs went up higher sharply at specific frequencies as seen in actual measurements. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Wave absorber / anechoic chamber / EMC / SVSWR / diffracted wave / scattered wave |
| Paper # | EMCJ2011-99 |
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| Conference Information | |
| Committee | EMCJ |
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| Conference Date | 2011/12/2(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| 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) | Simulations for site VSWR with consideration of diffracted wave of pyramidal electromagnetic wave absorber |
| Sub Title (in English) | |
| Keyword(1) | Wave absorber |
| Keyword(2) | anechoic chamber |
| Keyword(3) | EMC |
| Keyword(4) | SVSWR |
| Keyword(5) | diffracted wave |
| Keyword(6) | scattered wave |
| 1st Author's Name | Takahiro AOYAGI |
| 1st Author's Affiliation | Department of Human System Science, Graduate School of Decision Science and Technology, Tokyo Institute of Technology() |
| 2nd Author's Name | Hiroshi KURIHARA |
| 2nd Author's Affiliation | EMC&RF Engineering Buisiness Division, TDK Corporation |
| 3rd Author's Name | Koji TAKIZAWA |
| 3rd Author's Affiliation | EMC&RF Engineering Buisiness Division, TDK Corporation |
| Date | 2011-12-09 |
| Paper # | EMCJ2011-99 |
| Volume (vol) | vol.111 |
| Number (no) | 335 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |