| Presentation | 2004/10/22 Effective Use of Two Freedoms in Reactance Diversity of 3-element ESPAR Antenna Kyouichi IIGUSA, Takuma SAWAYA, Makoto YAMAMOTO, Makoto TAROMARU, Takashi OHIRA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In the case of 3-element ESPAR antenna, impedance matching is kept while reactance (reactance) diversity controlling by exchanging reactance value set of variable reactors loading to two parasitic elements. So far, the reactance diversity was estimated with fixed reactance value set, in this paper the reactance value set is optimized to achieve a high diversity effect by using a steepest gradient method. The result shows that reactance value sets, which minimize the cross correlation coefficient almost zero, exist continuously. Therefore, with having diversity effect, the one freedom remains, as there are two variable reactances. By using the freedom, an improvement of impedance matching, an increase of the gain in the DOA direction and a devised DC voltage control are proposed. In order to estimate a gain improvement, it is needed to calculate a level of radiation pattern. So the formulations to calculate a directivity and a gain with considering impedance matching by introducing a vector effective length in an equivalent weight vector model is made clear. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | ESPAR antenna / Reactance / Diversity / Cross-correlation coefficient / Impedance matching |
| Paper # | A・P2004-153,RCS2004-174 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2004/10/22(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Effective Use of Two Freedoms in Reactance Diversity of 3-element ESPAR Antenna |
| Sub Title (in English) | |
| Keyword(1) | ESPAR antenna |
| Keyword(2) | Reactance |
| Keyword(3) | Diversity |
| Keyword(4) | Cross-correlation coefficient |
| Keyword(5) | Impedance matching |
| 1st Author's Name | Kyouichi IIGUSA |
| 1st Author's Affiliation | ATR Wave Engineering Laboratories() |
| 2nd Author's Name | Takuma SAWAYA |
| 2nd Author's Affiliation | ATR Wave Engineering Laboratories |
| 3rd Author's Name | Makoto YAMAMOTO |
| 3rd Author's Affiliation | ATR Wave Engineering Laboratories |
| 4th Author's Name | Makoto TAROMARU |
| 4th Author's Affiliation | ATR Wave Engineering Laboratories |
| 5th Author's Name | Takashi OHIRA |
| 5th Author's Affiliation | ATR Wave Engineering Laboratories |
| Date | 2004/10/22 |
| Paper # | A・P2004-153,RCS2004-174 |
| Volume (vol) | vol.104 |
| Number (no) | 399 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |