Improved notch filter for microwave plasma diagnostics in 70 GHz range
作者: M. NishiuraS. KuboK. TanakaS. KobayashiK. OkadaK.J. OkadaT. NishimuraT. MushiakeT. ShimozumaT. MutohT. SaitoY. TatematsuY. Yamaguchi
作者单位: 1Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561 Japan
2National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu, 509-5292 Japan
3Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui, 910-8507 Japan
刊名: Journal of Instrumentation, 2015, Vol.10 (12)
来源数据库: Institute of Physics Journal
DOI: 10.1088/1748-0221/10/12/C12014
原始语种摘要: A notch filter in 70 GHz range is developed to eliminate undesirable signals for plasma diagnostics using millimeter waves. We require a robust and narrow band characteristic for the notch filter. Since the previous notch filter which we reported contains the spurious notches, the plungers are improved to reduce the spurious notches. The lossy disks infill the gaps between the plungers and the cavities. The insert of the lossy disks minimizes the spurious notches around 76–78 GHz, while the insertion loss increases in the frequency range from 77.5 to 80 GHz. The plungers with differential screws are also used to make the tuning fine. For further performance increase, based on the same cavity mode, the design of coupling slits is modified to coupling holes. The simulated results in the...
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  • spurious 乱真
  • range 射程
  • filter 过滤机
  • diagnostics 诊断学
  • notch 凹槽
  • coupling 连接
  • lossy 修]有损耗[失
  • improved 改进
  • previous 先前的
  • developed 开发