| Project/Area Number |
12555108
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
情報通信工学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
HIROKAWA Jiro Tokyo Institute of Technology, Associate Professor, 大学院・理工学研究科, 助教授 (00228826)
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| Co-Investigator(Kenkyū-buntansha) |
HIRACHI Yasutake Fujitsu Quantum Devices, Manager, 開発センター, 室長(研究職)
SAKURAI Kimio Tokyo Institute of Technology, Research Associate, 大学院・理工学研究科, 助手 (30016620)
ANDO Makoto Tokyo Institute of Technology, Professor, 大学院・理工学研究科, 教授 (90159533)
ARAI Yukikazu Taisei, Group Leader, 通信デバイスグループ, 副主幹(研究職)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 2001: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | millimeter wave / post / slot antenna / planar antenna / Butler matrix / waveguide |
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| Research Abstract |
Various sizes of 76-Ghz post-wall waveguide-fed parallel plate slot arrays are designed and manufactured. 40-50 % efficiency has been obtained for various sizes from 26 mm x 24 mm to 104 mm x 100 mm. Sidelobe suppression is demonstrated for car radar applications. Measured sidelobes are below -22 dB for one-dimensional Taylor tapering while those for two-dimensional Taylor distribution are below -18 dB. A new configuration of three slots is proposed to radiate a 45-degree linearly polarized wave. A good cross-polarization level below -25 dB is achieved in the boresight.
The internal fields and the aperture illumination are effectively approximated in an oversized rectangular slotted array. Excitation coefficient of the radiation unit is assumed by introducing the perturbation ratio, which is defined by the ratio of unit-incident fields in terms of that in the linear array design model of periodic boundary waveguide. This ratio is varied over the two-dimensional aperture of the array and explains the perturbation of slots and narrow walls. The measured aperture illumination shows the good agreement with the prediction by the proposed method.
A single layer structure consisting of a 4-way Butler matrix and a waveguide slot array in the post wall waveguides is proposed. Each one of four input ports generates different linear phase distribution over the elements, and results in different main beam directions. Butler matrix generally needs cross-junctions in three-dimensional structure. The single-layer structure is realized by introducing short slot directional couplers. A 26 GHz model is designed and manufactured. Switching operation has been confirmed.
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