| Paper Abstract and Keywords |
| Presentation |
2004-10-29 09:30
Effectively use of two freedoms as for reactance diversity of 3-element ESPAR antenna
Kyouichi Iigusa, Takuma Sawaya, Makoto Yamamoto, Makoto Taromaru, Takashi Ohira (ATR) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (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) |
| (in English) |
ESPAR antenna / Reactance / Diversity / Cross-correlation coefficient / Impedance matching / / / |
| Reference Info. |
IEICE Tech. Rep., vol. 104, no. 396, AP2004-153, pp. 1-6, Oct. 2004. |
| Paper # |
AP2004-153 |
| Date of Issue |
2004-10-22 (AP, RCS) |
| ISSN |
Print edition: ISSN 0913-5685 |
| Download PDF |
|
| Conference Information |
| Committee |
RCS AP |
| Conference Date |
2004-10-28 - 2004-10-30 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Niigata University |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
Adaptive Antenna, MIMO, Wireless Signal Processing, Wireless Communication Systems, etc. |
| Paper Information |
| Registration To |
AP |
| Conference Code |
2004-10-RCS-AP |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Effectively use of two freedoms as for reactance diversity of 3-element ESPAR antenna |
| Sub Title (in English) |
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| Keyword(1) |
ESPAR antenna |
| Keyword(2) |
Reactance |
| Keyword(3) |
Diversity |
| Keyword(4) |
Cross-correlation coefficient |
| Keyword(5) |
Impedance matching |
| Keyword(6) |
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| Keyword(7) |
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| Keyword(8) |
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| 1st Author's Name |
Kyouichi Iigusa |
| 1st Author's Affiliation |
ATR (ATR) |
| 2nd Author's Name |
Takuma Sawaya |
| 2nd Author's Affiliation |
ATR (ATR) |
| 3rd Author's Name |
Makoto Yamamoto |
| 3rd Author's Affiliation |
ATR (ATR) |
| 4th Author's Name |
Makoto Taromaru |
| 4th Author's Affiliation |
ATR (ATR) |
| 5th Author's Name |
Takashi Ohira |
| 5th Author's Affiliation |
ATR (ATR) |
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| Speaker |
Author-1 |
| Date Time |
2004-10-29 09:30:00 |
| Presentation Time |
25 minutes |
| Registration for |
AP |
| Paper # |
AP2004-153, RCS2004-174 |
| Volume (vol) |
vol.104 |
| Number (no) |
no.396(AP), no.399(RCS) |
| Page |
pp.1-6 |
| #Pages |
6 |
| Date of Issue |
2004-10-22 (AP, RCS) |
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