| Presentation | 2003/9/4 An Adaptive Control method for ESPAR Antenna with RF-MEMS Variable Riactors Yuji IRIE, Shinsuke HARA, Yuuta NAKAYA, Takeshi TODA, Yasuyuki OISHI, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In this paper, we propose a new control method for ESPAR (Electrically Steerable Passive Array Radiators) antenna with RF-MEMS (Radio Frequency-MicroElectoMecanical System) variable riactors. Operation speed of the RF-MEMS variable riactors is much slower than that of semiconductor variable riactors (varactor diodes), due to its mechanical system. Thus we need to consider it's mechanical speed into it's control method. We solve a multi-dimensional-minimization problem as iterations of a mono-dimensional-minimization ploblem. Furthermore, we propose a smoothing method to prevent wrong weight-control caused by noise and a Multi-Resolution method which changes the step size of the RF-MEMS variable reactance according to the number of iterations. We also proposed a cost function to dimish delayed signals beyond guard time in OFDM (Orthogonal Frequency Division Multiplexing) systems. Our computer simulation results based on IEEE802.11a show that our proposed control method and cost function are effective for interference suppression. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Adaptive control method / ESPAR (Electronically Steerable Passive Array Radiators) / IEEE802.11a / interference / Multi-Resolution / RF-MEMS (Radio Frequency-MicroElectoMechanical System) / variable riactors operation speed |
| Paper # | A・P2003-135 |
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| Conference Information | |
| Committee | AP |
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| Conference Date | 2003/9/4(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Antennas and Propagation (A・P) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | An Adaptive Control method for ESPAR Antenna with RF-MEMS Variable Riactors |
| Sub Title (in English) | |
| Keyword(1) | Adaptive control method |
| Keyword(2) | ESPAR (Electronically Steerable Passive Array Radiators) |
| Keyword(3) | IEEE802.11a |
| Keyword(4) | interference |
| Keyword(5) | Multi-Resolution |
| Keyword(6) | RF-MEMS (Radio Frequency-MicroElectoMechanical System) |
| Keyword(7) | variable riactors operation speed |
| 1st Author's Name | Yuji IRIE |
| 1st Author's Affiliation | Department of Electronic, Information, and Energy Engineering, Graduate School of Engineering, Osaka University() |
| 2nd Author's Name | Shinsuke HARA |
| 2nd Author's Affiliation | Department of Electronic, Information, and Energy Engineering |
| 3rd Author's Name | Yuuta NAKAYA |
| 3rd Author's Affiliation | Fujitsu Limited YRP Research & Development Center |
| 4th Author's Name | Takeshi TODA |
| 4th Author's Affiliation | Fujitsu Limited YRP Research & Development Center |
| 5th Author's Name | Yasuyuki OISHI |
| 5th Author's Affiliation | Fujitsu Limited YRP Research & Development Center |
| Date | 2003/9/4 |
| Paper # | A・P2003-135 |
| Volume (vol) | vol.103 |
| Number (no) | 297 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |