| Project/Area Number |
16560321
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Ibaraki University |
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Principal Investigator |
KAGOSHIMA Kenichi Ibaraki University, The College of Engineering, Professor, 工学部, 教授 (70292472)
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| Co-Investigator(Kenkyū-buntansha) |
OBOTE Shigeki Ibaraki University, The College of Engineering, Associate Professor, 工学部, 助教授 (50323209)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Antenna / Array antenna / Mutual coupling / Maximum directivity / Maximum received power / Element matched load / Reciprocity of directive patterns / CCD / 人体内 / 人体内飲み込み / CCDカメラ内蔵カプセル / アダプティブアンテナ / 画像伝送 / アンテナシステム |
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| Research Abstract |
The purpose of this research work was to improve the performance of wireless capsule endoscopes by adaptive array antenna technologies. Quality of transmitted inner body images can be improved by array antenna technologies and this is also effective to suppress the negative effects by inner body muscle and bone. Especially, the most important research problem is how to determine antenna allocation and their variable antenna weights.
We have established the theoretical model of a receiving array antenna system considering mutual coupling effect. Furthermore the comparative study between the array antenna with maximum receiving power and the array antenna with maximum transmitting directivity gain has been performed. The weights of the array antenna with maximum receiving power were determined based on Minimum Mean Square Error (MMSE) criteria. By the comparative study, we have arrived at the necessary condition which is required in closely spaced adaptive array antennas.
Furthermore, we have chosen Tapped Delay Line-Adaptive Array Antenna (TDL-AAA) as the most suitable adaptive array antenna system because TDL-AAA is a spacial and temporal equalizer. This equalizer is very effective to reduce the number of antenna elements under a dense multipath environment. We have derived the required number of antenna elements and tap stages based on the zero forcing criteria.
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