A Constant Corrugation Circular Waveguide for High-Pass Signal Diagnostics in ECEI System at 75–110 GHz

Abstract

In this work, a high-pass waveguide filter with constant circular corrugations is presented. The proposed design allows propagation of HE11 mode which has similar Gaussian characteristics of the signals present in a fusion reactor. The device is designed to operate in W-band, i.e., 75–110 GHz, and it generates a wide passband of approximately 30 GHz. The internal corrugations in the proposed design are kept constant which makes fabrication relatively simpler. The proposed high-pass metallic waveguide is numerically analyzed, simulated, and fabricated for experimental validation. The measured transmission co-efficient (S21) shows good agreement with the simulated result and passband of 28 GHz was obtained. The high-pass filter can be effectively used in the electron cyclotron emission imaging (ECEI) system used in fusion plasma experiments for signal diagnostics.

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Acknowledgments

This publication is an outcome of the R&D work undertaken in the Project under the Visvesvaraya Ph.D. Scheme of Ministry of Electronics & Information Technology, Government of India, being implemented by Digital India Corporation (Formerly Media Lab Asia). The authors thank the Institute for Plasma Research director, ITER-India project director, and Electronics Engineering Department, SVNIT-Surat, for supporting this work. The authors are also thankful to Dr. A. A. Shaikh from Mechanical Engineering Department, SVNIT, for helping in device fabrication.

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Correspondence to Hirenkumar V. Dhuda.

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Dhuda, H.V., Patel, P.N. & Pandya, H.B. A Constant Corrugation Circular Waveguide for High-Pass Signal Diagnostics in ECEI System at 75–110 GHz. J Infrared Milli Terahz Waves (2020). https://doi.org/10.1007/s10762-020-00720-3

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Keywords

  • Circular corrugated waveguide
  • Hybrid mode
  • High-pass filter
  • Electron cyclotron emission imaging