MICROWAVE TRAVELLING WAVE TUBE - A SUMMARY OF AN ANALYTICAL, NUMERICAL AND EXPERIMENTAL THERMAL ANALYSIS
DOI:
https://doi.org/10.29121/granthaalayah.v5.i6.2017.2042Keywords:
Travelling Wave Tube, Microwaves, Heat Dissipation, Analytical Analysis, Numerical Modeling, Experimental MeasurementsAbstract [English]
Travelling Wave Tube (TWT) is an electronic vacuum microwave device, which is used as a high power microwave amplifier, mainly in telecommunication purposes and radar systems. TWT's seem to be an alternative and a more reliable solution than semiconductor devices when building high power and high frequency applications. Thermal behaviour of TWT is one of the key aspects influencing its reliability and working parameters. In fact, the standard TWT is treated as a high power device and the supplied power is dissipated mainly through conduction and convection phenomena. In practical applications, depending on a type of TWT, they can be cooled either by a forced liquid or air circulation. The main goal of the presented research was to perform analytical, experimental and numerical analysis of temperature distribution of a low band TWT in case of a typical working condition. Because theoretical analysis seems to be very complex, thus it was decided to support it with experimental measurements and numerical simulations as well as with the simplified analytical formulas. As a first step of the presented research, the analytical analysis and numerical modelling of the helix TWT was carried out. The objective of the thermal analysis was to assess the temperature distribution in different parts of the helix TWT assembly during extreme standard and working conditions. Afterwards, the obtained numerical results were validated by experimental measurements, which were carried out using a custom designed TWT test sample and corresponding experimental measurement tools.
Downloads
References
R.Baker et. al., "Modern Microwave and milimeter-wave power electronics", IEEE Pres.Wiley 2005
R. Gilmour, "Traveling Wave Tubes, Magnetrons, Cross-Field Amplifiers and Gyrotrons", 2011
Wiejak W., Wymysłowski A.; "Thermal analysis of TWT delay line by combined theoretical and numerical approach", 33th International Conference and Exhibition, IMAPS–Poland 2009, Pszczyna, 2009,
Wiejak W., Wymysłowski A.; "Uproszczony analityczny model rozpraszania mocy w linii późniającej lampy fali bieżącej"; Elektronika vol. 3/2010
Robbins, N. R., Christensen, J. A., & Hallsten, U. R., "Performance and reliability advances in TWT - A high power amplifiers for communications satellites", Military Communications Conference, MILCOM 2005, 1887-1890
Brittain, J. E., "Electrical Engineering Hall of Fame: John A. Fleming", Proceedings of the IEEE 95, Vol. 95, Issue: 1, 2007, pp.: 313–315
R. Kompfner, "The Invention of the Traveling-Wave Tube", San Francisco Press., 1964, p. 30.
Cosslett V.E.; "Introduction to electron optics"; Oxford University Press, London, 1950
Paszkiewicz, B.; "Optyka elektronowa"; PWN, Warszawa, 1960
Gilmour, Jr. A.S.; "Principles Of Traveling Wave Tubes"; Artech House Boston, London, 1994
Wiejak W.; PhD thesis: "Zastosowanie analitycznych i numerycznych metod wspomagania projektowania do lamp z falą bieżącą", 2013, Wroclaw University of Technology, Poland
Wiejak W., Wymysłowski A.; "Analytical, numerical and experimental approach to thermal analysis and design of a travelling wave tube"; Proceedings of the 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2015; Budapest, Hungary, 2015 DOI: https://doi.org/10.1109/EuroSimE.2015.7103098
JM Weekley, TWTA versus SSPA: A comparison of on-orbit reliability data, IEEE Trans on Electron Dev 2005 DOI: https://doi.org/10.1109/TED.2005.845864
W.Q. Lohmeyer, Thesis proposal - Space Environment Impacts on Geostationary Communications Sattelites, 2013, MIT
Behnke L.K.,Montgomery K.L.,Whaley D.R., True R.B., Electron Gun Thermal Design, Analysis and Experimental Validation, 1-4244-0108-9/06/$20.00 C 2006 IEEE
Czarczyński W., „Lampy mikrofalowe, Wydawnictwa Komunikacji i Łączności, Warszawa 1971
True R., “Tunnel emittance growth in PPM focused TWT’s, Techncal Digest, 1985, International Electron Devices Meeting, pp192-195 DOI: https://doi.org/10.1109/IEDM.1985.190927
Gewartowski J.W.,Watson H.A., Principles of Electron Tubes,D.Van Nostrand Company, Inc. 1965
Lucken J.A., Some Aspects of Circuit Power Dissipation in High Power CW Helix Traveling-Wave Tubes, Part I: General Theory, IEEE Transaction On Electron Devi, Vol. ED-16, No.9, September 1969 DOI: https://doi.org/10.1109/T-ED.1969.16858
Lucken J.A., Some Aspects of Circuit Power Dissipation in High Power CW Helix Traveling-Wave Tubes, Part I: Scaling Laws, IEEE Transaction On Electron Devi, Vol. ED-16, No.9, pp.821-826, September 1969 DOI: https://doi.org/10.1109/T-ED.1969.16859
Wymysłowski A., Numeryczne metody projektowania termomechanicznego w montażu elektronicznym, Oficyna Wydawnicza Politechniki Wrocławskiej, Wrocław 2007
Shojaefard M.H. and Goudarzi K., The Numerical Estimation of Thermal Contact Resistance in Contacting Surfaces, American Journal of Applied Sciences 5 (11): 1566-1571, 2008 DOI: https://doi.org/10.3844/ajassp.2008.1566.1571
Downloads
Published
How to Cite
Issue
Section
License
With the licence CC-BY, authors retain the copyright, allowing anyone to download, reuse, re-print, modify, distribute, and/or copy their contribution. The work must be properly attributed to its author.
It is not necessary to ask for further permission from the author or journal board.
This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
