| Project/Area Number |
15360180
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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 | 一般 |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
BAE Jongsuck Nagoya Institute of Technology, Engineering Physics, Electronics and Mechanics, Professor, 工学研究科, 教授 (20165525)
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| Co-Investigator(Kenkyū-buntansha) |
KIMURA Takashi Nagoya Institute of Technology, Engineering Physics, Electronics and Mechanics, Associate Professor, 工学研究科, 助教授 (60225042)
ODA Akinori Nagoya Institute of Technology, Engineering Physics, Electronics and Mechanics, Research Associate, 工学研究科, 助手 (70335090)
ISHIKAWA Ryo the University of Electro-Communications, Information and Communication Engineering, Research Associate, 情報通信工学科, 助手 (30333892)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,400,000 (Direct Cost: ¥15,400,000)
Fiscal Year 2005: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2003: ¥8,000,000 (Direct Cost: ¥8,000,000)
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| Keywords | special power combining / harmonic generation / short millimeter wave / Gunn diode / oversized waveguide |
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| Research Abstract |
This research project has been planed to develop a high power solid-state oscillator operating at short-millimeter wave frequencies utilizing a spatial power combining technique. For this purpose, an oversized (overmoded) -waveguide harmonic oscillator which incorporates an array of TE_<10> mode waveguides containing solid state devices into the resonator, have been used for an efficient power combining of harmonic-mode devices. In the overmoded-waveguide resonator, solid state devices, in our case Gunn diodes, oscillate at the fundamental frequency in phase and then generate the second harmonic waves. The harmonic waves from a number of the diodes are combined coherently and spatially in the same resonator, so that higher power can be attained even at high frequencies above 90 GHz. The theoretical and experimental results are as follows,
1.Coherent power combining of fifteen Gunn diodes has been demonstrated for the first time at the harmonic frequencies between 89GHz and 99 GHz.
2.A power combining efficiency of about 67% and an output power of 0.25 W (continuous wave) at 94 GHz band has been achieved with a 5x3 waveguide Gunn diode array. These results indicate that the overmoded waveguide resonator for spatial power combining of harmonic-mode devices is very useful for producing intense short-millimeter waves.
3.In order to design the resonator, the equivalent circuit for the overmoded waveguide harmonic oscillator has been developed theoretically and verified experimentally.
4.Effectiveness of a lamellar back short which can tune the resonator at both the fundamental and the second harmonic frequencies has been confirmed.
5.It has been found that the power combining efficiency has been determined mainly by uniformity of rf-characteristics of the diodes.
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