Skip to main content
SpringerLink
Log in

Equivalent Circuit Analysis of Serpentine Folded-waveguide Slow-wave Structures for Millimeter-wave Traveling-wave Tubes

  • Published:
Journal of Infrared, Millimeter, and Terahertz Waves Aims and scope Submit manuscript

Abstract

A simple equivalent circuit model for the analysis of dispersion and interaction impedance characteristics of serpentine folded-waveguide slow-wave structure was developed by considering the straight and curved portions of structure supporting the dominant TE 10-mode of the rectangular waveguide. Expressions for the lumped capacitance and inductance per period of the slow-wave structure were derived in terms of the physical dimensions of the structure, incorporating the effects of the beam-hole in the lumped parameters. The lumped parameters were subsequently interpreted for obtaining the dispersion and interaction impedance characteristics of the structure. The analysis was simple yet accurate in predicting the dispersion and interaction impedance behaviour at millimeter-wave frequencies. The analysis was benchmarked against measurement as well as with 3D electromagnetic modeling using MAFIA for two typical slow-wave structures (one at the Ka-band and the other at the W-band) and close agreement observed.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6

Similar content being viewed by others

Abbreviations

SFW:

Serpentine Folded-waveguide

SWS:

Slow-wave structure

TWT:

Traveling-wave tube

References

  1. J. Cai, J. Feng, Y. Hu, X. Wu, B. Qu, S. Ma, J. Zhang, and T. Chen, Attenuator for W-band folded waveguide TWT. Proceedings of the IEEE International Vacuum Electronics Conference 9th, USA, 20–21 (2008).

  2. H. –R. Gong, Y. –B. Gong, Z. –G. Lu, W. –X. Wang, and J. Feng, The design of Ka-band high power folded waveguide traveling-wave tube. Proceedings of the IEEE International Vacuum Electronics Conference 9th, USA, 119–120 (2008).

  3. A. J. Thesis, C. J. Meadows, K. L. Montgomery, and M. Martin, Development of a high average power W-band TWT. Proceedings of the IEEE International Vacuum Electronics Conference 9th, USA, 197–198 (2008).

  4. J. Feng, J. Cai, X. Wu, S. Ma, Y. Hu, and M. Huang, Design investigation of 10W W-band folded waveguide TWT. Proceedings of the IEEE International Vacuum Electronics Conference 8th, Japan, 77–78 (2007).

  5. J. K. So, Y. M. Shin, K. H Jang, J. H. Won, A. Srivastava, M. A Sattorov, G. S. Park, J. H. Kim and S. S. Chang, Experimental study on 100 GHz two-step LIGA-based backward wave devices. Proceedings of the IEEE International Vacuum Electronics Conference 8th, Japan, 369–370 (2007).

  6. L. Shunkang, Folded waveguide circuit for broadband MM wave TWTs. Int. J. Infrared Millim. Waves 16, 809–815 (1995).

    Article  Google Scholar 

  7. Y. H. Na, S. W. Chung, and J. J. Choi, Analysis of a broadband Q-band folded-waveguide traveling-wave tube. IEEE Trans. Plasma Sci. 30, 1017–1022 (2002).

    Article  Google Scholar 

  8. S. -T. Han, J. -II Kim, and G. S. Park, Design of a folded waveguide traveling-wave tube. Microw. Opt. Technol. Lett. 38, 161–165 (2003).

    Article  Google Scholar 

  9. J. H. Booske, M. C. Converse, C. L. Kory, C. T. Chevalier, D. A. Gallagher, K. E. Kreischer, V. O. Heinen, and S. Bhattacharjee, Accurate parametric modeling of folded waveguide circuits for millimeter-wave traveling wave tubes. IEEE Trans. Electron Devices 52, 685–693 (2005).

    Article  Google Scholar 

  10. H. J. Curnow, A general equivalent circuit for couple-cavity slow-wave structures. IEEE Trans. Microw. Theory and Tech. 13, 671–675 (1965).

    Article  Google Scholar 

  11. R. G. Carter, and L. Shunkang, Method for calculating the properties of coupled-cavity slow-wave structures from their dimensions. IEE Proc.-H, Microw. Ant. and Prop. 133, 330–334 (1986).

    Google Scholar 

  12. N. Marcuvitz, Waveguide Handbook. (Peter Peregrinus, London, 1986).

    Google Scholar 

  13. M. Genack, S. Bhattacharjee, J. Booske, C. Kory, S. –J. Ho, D. van der Waide, L. Ives, and M. Read, Measurements of microwave electrical characteristics of folded waveguide circuits. Proceedings of the IEEE International Vacuum Electronics Conference 5th, USA, 2004, pp. 96–97.

Download references

Acknowledgments

The authors are thankful to Dr. Lalit Kumar, Dr. K. S. Bhat and Dr. V. Latha Christie for many valuable suggestions to improve the work. Authors are also thankful to Microwave Tube R&D Centre for kind permission to use the experimental results.

Author information

Authors and Affiliations

  1. Microwave Tube Research and Development Centre, Bharat Electronics Complex, Jalahalli Post, Bangalore, 560013, India

    M. Sumathy & S. K. Datta

  2. Department of Electronics & Communication Engineering, Indian Institute of Science, Bangalore, 560054, India

    K. J. Vinoy

Authors
  1. M. Sumathy
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. K. J. Vinoy
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. S. K. Datta
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to M. Sumathy.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Sumathy, M., Vinoy, K.J. & Datta, S.K. Equivalent Circuit Analysis of Serpentine Folded-waveguide Slow-wave Structures for Millimeter-wave Traveling-wave Tubes. J Infrared Milli Terahz Waves 30, 151–158 (2009). https://doi.org/10.1007/s10762-008-9431-0

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10762-008-9431-0

Keywords

Search

Navigation