| Project/Area Number |
24540234
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
OGAWA Hideo 大阪府立大学, 理学(系)研究科(研究院), 教授 (20022717)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 電波天文学 / 導波管 / セプタム型 / 円偏波 / ポーラライザー / VLBI観測 / 広帯域化 / 高周波化 / 受信機 / 導波管回路 / 偏波分離器 / OMT / 円偏波分離器 ( CP ) / 交差偏波分離度 / 1.85m 望遠鏡 / 宇宙物理 / 精密部品加工 / ミリ波 |
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| Outline of Final Research Achievements |
Waveguide-Septum type Circular Polarizer , which is needed on VLBI Observation - the way to achieve the highest angular resolution - , has some defects ; narrowness of usable frequency band-width , and the degradation of its frequency characteristics at over 80 GHz Band.
In our study , we have addressed to improve , resolve those defects , and the results are ; 1. Broaden 10% to 24 % of fractional bandwidth ( bandwidth / center freq. ) at CX and Ka Band ( 6-9 GHz , 22-32 GHz ), 2. Invent the solution to suppress causing degradation , and stabilize its frequency characteristics at 80 and 230 GHz band, 3. Put 230GHz band deliverables into practical use on radio-observation.
We expect that these results are led to improve and expand VLBI observation on each band , especially not possible until now .
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