Micro reentrant cavity for 100 GHz klystron

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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“…It was shown in [5] that the R/Q for the high order mode with the same Ez distribution of the fundamental mode could be more than 40% lower. A new topology of klystron that permits to use high order mode cavities providing relevant performance making viable the realization of compact and low cost millimeter wave and THz klystrons is presented [6].…”

Section: Introductionmentioning

confidence: 99%

Novel klystron approach for THz frequency amplification

Paoloni

2013

2013 6th UK, Europe, China Millimeter Waves and THz Technology Workshop (UCMMT)

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“…The micro re-entrant square cavity [6] was demonstrated as a promising solution for the design of klystrons at mm-wave frequencies. It supports a high order mode with an electric field distribution on the cavity gap similar to the one of the fundamental mode.…”

Section: Introductionmentioning

confidence: 99%

Microwave coupler for W‐band micro re‐entrant square cavities

Paoloni

Mineo

Yin³

et al. 2016

IET Microwaves, Antennas & Propagation

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Klystrons are vacuum electronic devices widely used for microwave amplification up to the millimetre-wave region. The opportunity to push the operating frequency of conventional klystrons above 30–40 GHz is limited by the fabrication difficulties of the cavities that have very small dimensions. A high order mode micro re-entrant square cavity was purposely devised to be compatible with the available micro fabrication processes and represents a viable solution for the design of millimetre-wave klystrons. In this study, a coupler to correctly excite the higher order mode of the square re-entrant cavities for W-band operation is proposed. The design of the proposed novel coupler structure has been validated by realisation and measurement of a scaled X-band prototype. The post-realisation tuning methods adopted to improve the matching of the high order mode are also presented

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Micro reentrant cavity for 100 GHz klystron

Cited by 11 publications

References 7 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

Novel klystron approach for THz frequency amplification

Microwave coupler for W‐band micro re‐entrant square cavities

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