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  4. Vol 9, Issue 1, 2024

Study on a Helix-Loaded Azimuthally Periodic Circular Waveguide for Short-Millimeter Wave TWT

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DOI: 10.23977/jemm.2024.090115 | Downloads: 3 | Views: 81

Author(s)

Yang Liu 1, Xuying Zhang 1, Jun Wang 1, Yujiang Zhao 1, Bing Feng 1

Affiliation(s)

1 Science and Technology on Electronic Information Control Laboratory, Chengdu, 610000, China

Corresponding Author

Yang Liu

ABSTRACT

The transmitter is a key component in electronic systems and equipment for amplifying signal power, and the traveling wave tube (TWT) is a core component that realizes the key performance within the transmitter. For a long time, the slow wave structure (SWS) has been a key factor that restricts the improvement of TWT performance and the reduction of costs, which in turn limits the overall output power and operating frequency band of the transmitter. Therefore, the potential of helix slow wave structure(SWS) working at W band and higher frequency range is considered and the novel helix SWS is presented for high power wideband TWT in this paper. The proposed novel SWS consists of helixes that are arranged periodically about the axis of the conventional dielectric-lined circular waveguide. Here, the helixes are fixed in the dielectric layer, and a solid electron beam with larger radius passes through the waveguide center. The slow-wave dispersion equation and interaction impedance expression are obtained by the spatial harmonics method. The effects of the SWS parameters on the RF characteristics, including the pitch and the thickness and the angle of the helixes, are numerically calculated and discussed. It is indicated that selecting the appropriate thickness and angle of the helixes can increase the interaction impedance with only slight influence on the dispersion characteristics (pitch fixed). Moreover, compared with a dielectric-lined azimuthally periodic circular waveguide (DLAP-CW), the novel circuit is much shorter than the DLAP-CW-based circuit with good performance at the working frequencies. The HLAP-CW, therefore, will favor the miniaturized design of a high-power millimeter-wave TWT.

KEYWORDS

Transmitter, traveling wave tube, slow wave structure, novel helix, azimuthally periodic waveguide, dispersion characteristics, interaction impedance, spatial harmonics method

CITE THIS PAPER

Yang Liu, Xuying Zhang, Jun Wang, Yujiang Zhao, Bing Feng, Study on a Helix-Loaded Azimuthally Periodic Circular Waveguide for Short-Millimeter Wave TWT. Journal of Engineering Mechanics and Machinery (2024) Vol. 9: 95-104. DOI: http://dx.doi.org/10.23977/jemm.2024.090115.

REFERENCES

[1] C. Kory, L. Ives, J. Booske, S. Bhattacharjee et al., "Novel TWT interaction circuits for high frequency applications," in Proc. 5th IEEE Int. Vacuum Electron. Conf., Eur. Space Agency, Apr. 2004, pp. 51–52.
[2] C. K. Chong, J. A. Davis, R. H. Le Brogne et al., "Development of high-power Ka-band and Q-band helix-TWTs ," IEEE Trans. Electron Devices, vol. 52, no. 2, pp. 653-659, May 2005.
[3] W. L. Menninger, N. R. Robbins, D. E. Dibb et al., "Power flexible Ka-band traveling wave tube amplifiers of up to 250-W RF for space communications," IEEE Trans. Electron Devices, vol. 54, pp. 181-187, Feb. 2007.
[4] C. R.Donaldson, Wenlong He, Adrian W. Cross et al., "Design and numerical optimization of a cusp-gun-based electron beam for millimeter-wave gyro-devices," IEEE Trans. Plasma Science, vol. 37, pp. 2153-2157,Mov. 2009.
[5] W. Wang, Y. Wei, G. Yu, Y. Gong, M. Huang, and G. Zhao, "Review of the novel slow-wave structures for high-power traveling-wave tube," Int. J. Infrared Millim. Waves, vol. 24, no. 9, pp. 1469–1484, Sep. 2003.
[6] Y. B. Gong, Y.Y. Wei, M.Z. Huang et al., "Research activities on millimeter wave TWT in UESTC," in GMSS, China, 2008, pp. 978-981.
[7] Yang Liu, Y.Y. Wei, Y. B. Gong and W. W. Wang, "Investigation on the Slow-Wave Properties of a Dielectric-Lined Azimuthally Periodic Circular Waveguide for TWT," IEEE Trans. Electron Devices, vol. 57, pp. 2019-2026, Aug. 2010.
[8] Sun-Shin Jung, Chan-Wook Baik, Seong-Tae Han et al., "Wide-Band Semivane and Heavily Dielectric Loaded Helix Traveling-Wave Tubes," IEEE Trans. Plasma Science, vol. 30, pp. 1009-1016, Jun. 2002.
[9] James A. Dayton, Jr., Carol L. Kory, Gerald T. Mearini et al., "Applying Microfabrication to Helical Vacuum Electron Devices for THz Applications," in IEEE International Vacuum Electronics Conference, Apr. 2009, pp. 41–44.
[10] Carol L. Kory, James A. Dayton, Jr., Gerald T. Mearini et al., "95 GHz Helical TWT Design," in IEEE International Vacuum Electronics Conference, Apr. 2009, pp. 125–126.
[11] James A. Dayton, Jr., Carol L. Kory, Gerald T. Mearini et al., "A 650 GHz Helical BWO," in IEEE International Vacuum Electronics Conference, Apr. 2008, pp. 396–397.
[12] Carol L. Kory and James A. Dayton, Jr., "Design of 650 GHz Helical BWO Using CST Studio Suite," in IEEE International Vacuum Electronics Conference, Apr. 2008, pp. 392–393.
[13] R. E. Collin, Field Theory of Guided Waves, New York: McGraw-Hill, 1960, ch. 11.
[14] Z. C. Ioannidis, O. Dumbrajs, and I. G. Tigelis, "Eigenvalues and ohmic losses in coaxial gyrotron cavity," IEEE Trans. Plasma Sci., vol. 32, no. 3, pp. 861-866, Jun. 2004.
[15] "High frequency structure simulator user's reference," Anosft Corp., 2001. (more information available online: [http://www.ansoft.com/])
[16] R. K. Arora, "Surface wave on a pair of parallel unidirectionlly conducting screens," IEEE Trans.Antennas Propagat, AT-14, pp. 795-797,1966 .
[17] Getting Started. Matlab help v 7.0.1., the Mathworks. Inc., Natick, Massachusetts., 2004. (more information available online: [http://www.mathworks.com/]) 

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