Analysis and design of the taper in metal-grating periodic slow-wave structures for rectangular Cerenkov masers

doi:10.1088/1674-1056/21/5/058401

Abstract The hybrid-mode dispersion equation of the metal-grating periodic slow-wave structure for a rectangular Cerenkov maser is derived by using the Borgnis function and field-matching methods. An equivalent-circuit model for the taper of the groove depth that matches the smooth waveguide to the metal-grating structure is proposed. By using the equivalent-circuit method, as well as the Ansoft high frequency structure simulator (HFSS) code, an appropriate electromagnetic mode for beam-wave interaction is selected and the equivalent-circuit analysis on the taper is given. The calculated results show that a cumulative reflection coefficient of 0.025 for the beam-wave interaction structure at a working frequency of 78.1 GHz can be reached by designing the exponential taper with a TE_z10 rectangular waveguide mode as the input and the desired TE_x10 mode as the output. It is worth pointing out that by using the equivalent-circuit method, the complex field-matching problems from the traditional field-theory method for taper design can be avoided, so the taper analysis process is markedly simplified.

Keywords: rectangular Cerenkov maser Borgnis function method equivalent-circuit method HFSS taper

Received: 27 September 2011
Revised: 27 April 2012
Accepted manuscript online:

PACS:	84.40.Ik	(Masers; gyrotrons (cyclotron-resonance masers))
	94.05.Pt	(Wave/wave, wave/particle interactions)
	41.60.Bq	(Cherenkov radiation)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60801031).

Cite this article:

Chen Ye(陈晔), Zhao Ding(赵鼎), Wang Yong(王勇), and Shu Wen(舒雯) Analysis and design of the taper in metal-grating periodic slow-wave structures for rectangular Cerenkov masers 2012 Chin. Phys. B 21 058401

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Analysis and design of the taper in metal-grating periodic slow-wave structures for rectangular Cerenkov masers

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