Analysis and Simulation of Reentrant Cylindrical Cavities

Abstract-Manufacturing of klystrons in the millimeter wave frequency range is challenging due to the small size of the cavities, and the ratio of the maximum gap voltage to the beam energy. The small dimensions make also difficult to produce devices with the output power required by a number of applications at millimeter wave, such as communications and spectroscopy. Operating with a higher order mode can be a potential solution, as a larger transverse size structure can be used. Unfortunately, high order mode cavities have a lower impedance than in fundamental mode. In this paper is proposed a novel solution to overcome the reduced impedance by utilizing an upconverter, where all cavities except the output cavity are designed to work in high order mode. To demonstrate the effectiveness of the approach, two klystron upconverters were designed. One has 6 cavities aiming to achieve a maximum output power of ∼90 W at 105 GHz. The second klystron upconverter was a simpler 3 cavity structure designed for quick prototype. Millimeter wave measurements of the three-cavity klystron upconverter are presented.klystron, upconverter, high-order mode.

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“…A cuboid cavity with a flat re-entrant section was used as the klystron cavity [7]- [11]. The output cavity was chosen to operate at 105 GHz.…”

Section: High-order-mode Output Cavitymentioning

confidence: 99%

A Millimeter-Wave Klystron Upconverter With a Higher Order Mode Output Cavity

Zhang

Constable

Yin

et al. 2017

IEEE Trans. Electron Devices

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“…Then we seek a unifying expression that connects the two asymptotic regions. A suitable expression found is [4] f ðdÞ ¼ χc…”

Section: Mathematical Analysismentioning

confidence: 99%

“…More accurate models [8][9][10] calculate the admittances of the gap and lateral regions from the equivalent magnetic current using Green's functions, thereby entailing involved formulas and heavy computation. In the light of such considerations, Barroso et al [4] proposed a mathematically simple engineering solution for the problem by deriving a frequency equation encompassing expressions that are accurate enough only for small and large gap spacing. However the equation connecting two asymptotic regions of very small and very large gaps is to be solved numerically to get key design parameter for connecting two regions.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Analysis of Reentrant Klystron Cavity

Tiwari

Hannurkar

2010

J Infrared Milli Terahz Waves

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The mathematically simple formalism proposed earlier for calculating electromagnetic parameters of a reentrant cavity Barroso et al. (International Journal of Infrared and Millimeter Waves 26(8):1071-1083, 2005) is improved in usability by proposing a closed form solution for the parameter connecting two asymptotic regions of very small and very large gaps. The results obtained are verified with earlier reported results.

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“…The coaxial cavity and reentrant cavity can concentrate the field in a small area and enhanced the Efield [13][14][15]. Its structure is simple.…”

Section: Introductionmentioning

confidence: 99%

A 2.45 GHZ Reentarnt Coaxial Cavity for Liguid Sterilization Based on Non-Thermal Microwave Effect

Zhang¹,

Zhang

Zhang³

2012

PIER C

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Abstract-According to the intracellular electromanipulation model, bacteria can be killed at as high as 10 6 V/m electrical fields on microwave band. We designed and constructed a modified microwave coaxial cavity resonator for liquid sterilization. The cavity could concentrate the field on a very small area, and the liquid can pass it in milliseconds. The bacteria can be killed by the very high field, but with a slight temperature increase. The designed resonator is simulated and analyzed by electromagnetic simulation code. The results indicated that when the input power reached 100 W, the electric field on the area of liquid can reach 10 6 V/m. Preliminary experimental results indicated that when the input power was 100 W, the bactericidal rate was > 90%, and the temperature of the liquid only increased 8.6 • C.T M

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Analysis and Simulation of Reentrant Cylindrical Cavities

Cited by 31 publications

References 17 publications

A Millimeter-Wave Klystron Upconverter With a Higher Order Mode Output Cavity

A Millimeter-Wave Klystron Upconverter With a Higher Order Mode Output Cavity

Electromagnetic Analysis of Reentrant Klystron Cavity

A 2.45 GHZ Reentarnt Coaxial Cavity for Liguid Sterilization Based on Non-Thermal Microwave Effect

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