A multilayer waveguide window for wide-bandwidth millimeter wave tubes

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A multilayer waveguide window is demonstrated to exhibit wide bandwidth and high transmission for applications in high-frequency microwave tubes. A transfer matrix approach is employed to discretize the dielectric function profile of the multilayer heterostructure in a rectangular waveguide. The closed form has been obtained and the corresponding reflection and transmission characteristics have been carried out. The analytical calculation is also compared with the result of numerical simulation via the finite-element code HFSS. The exact calculation agrees with the numerical simulation very well. By comparison, the approach not only enhances the accuracy and efficiency, but also gives a good criterion for the design. The results show that the bandwidth for a transmission of 99%, i.e., S 11 below -20 dB, can be optimized to be about 8.75 GHz at a central frequency of 35 GHz or about 25%. A wide-bandwidth waveguide window can be easily designed for Ka-band and W-band tubes, and even for higher frequency ones.

Original languageEnglish
Pages (from-to)355-362
Number of pages8
JournalInternational Journal of Infrared and Millimeter Waves
Volume28
Issue number5
DOIs
StatePublished - 2007 May 1

Fingerprint

waveguide windows
Millimeter waves
millimeter waves
Multilayers
Waveguides
tubes
bandwidth
Bandwidth
Microwave tubes
microwave tubes
Rectangular waveguides
rectangular waveguides
Computer simulation
Heterojunctions
simulation
profiles

Keywords

  • HFSS
  • Millimeter waves
  • Multilayer waveguide window
  • Transfer matrix

Cite this

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abstract = "A multilayer waveguide window is demonstrated to exhibit wide bandwidth and high transmission for applications in high-frequency microwave tubes. A transfer matrix approach is employed to discretize the dielectric function profile of the multilayer heterostructure in a rectangular waveguide. The closed form has been obtained and the corresponding reflection and transmission characteristics have been carried out. The analytical calculation is also compared with the result of numerical simulation via the finite-element code HFSS. The exact calculation agrees with the numerical simulation very well. By comparison, the approach not only enhances the accuracy and efficiency, but also gives a good criterion for the design. The results show that the bandwidth for a transmission of 99{\%}, i.e., S 11 below -20 dB, can be optimized to be about 8.75 GHz at a central frequency of 35 GHz or about 25{\%}. A wide-bandwidth waveguide window can be easily designed for Ka-band and W-band tubes, and even for higher frequency ones.",
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A multilayer waveguide window for wide-bandwidth millimeter wave tubes. / Lin, Ming Chieh.

In: International Journal of Infrared and Millimeter Waves, Vol. 28, No. 5, 01.05.2007, p. 355-362.

Research output: Contribution to journalArticle

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AB - A multilayer waveguide window is demonstrated to exhibit wide bandwidth and high transmission for applications in high-frequency microwave tubes. A transfer matrix approach is employed to discretize the dielectric function profile of the multilayer heterostructure in a rectangular waveguide. The closed form has been obtained and the corresponding reflection and transmission characteristics have been carried out. The analytical calculation is also compared with the result of numerical simulation via the finite-element code HFSS. The exact calculation agrees with the numerical simulation very well. By comparison, the approach not only enhances the accuracy and efficiency, but also gives a good criterion for the design. The results show that the bandwidth for a transmission of 99%, i.e., S 11 below -20 dB, can be optimized to be about 8.75 GHz at a central frequency of 35 GHz or about 25%. A wide-bandwidth waveguide window can be easily designed for Ka-band and W-band tubes, and even for higher frequency ones.

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