Theoretical and Experimental Studies on the Asymmetric Mode Competition in an Overmoded<i>Ka</i>-Band Cerenkov Oscillator

Li, Shuang; Chen, Changhua; Teng, Yan; Liu, Wenyuan; Song, Zhimin; Wang, Dongyang; Cheng, Jun; Qiang, Lanpeng; Fan, Zhiqiang; Du, Zhaoyu

doi:10.1109/ted.2021.3053916

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…The relativistic backward wave oscillator (RBWO) with overmoded structures has the advantages of highpower capacity and high energy conversion efficiency, making it one of the most desired high-power microwave devices [13]. However, the overmoded structures can lead to asymmetric mode competition in the device, which can severely reduce the output power and affect the normal operation of the device [14][15][16][17][18][19]. To address this issue, some scholars have proposed a simple and efficient method, which involves filling an anisotropic medium with azimuthal conductivity in the Cerenkov device, effectively suppressing the asymmetric mode competition [20,21].…”

Section: Introductionmentioning

confidence: 99%

Advancing electromagnetic field modeling in axially anisotropic media with conformal method in 3D cylindrical coordinate systems

Tang,

Li,

Chen

et al. 2024

Phys. Scr.

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A conformal methodology for solving electromagnetic fields in axially anisotropic media in 3D cylindrical coordinate systems is proposed for the investigation of high-power microwave devices filled with such media. This method leverages the material properties of axially anisotropic media and employs the finite integral technique for solution. A simplified conformal algorithm is utilized for the boundaries of the computational region, extending the traditional conformal method for axially anisotropic media in 3D cylindrical coordinates. The proposed methodology is validated through simulations of TM01 and TE01 mode propagation in a circular waveguide filled with the medium. Subsequently, the method is integrated into particle-in-cell simulations, and an X-band relativistic backward wave oscillator filled with an axially anisotropic medium exhibiting azimuthal conductivity is numerically modeled. The results demonstrate that the medium with azimuthal conductivity effectively mitigates asymmetric modes in the relativistic backward wave oscillator, aligning with published literature. This study offers technical insights for research on high-power microwave devices incorporating axially anisotropic media, potentially facilitating the development of innovative microwave devices with enhanced performance characteristics.

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Section: Introductionmentioning

confidence: 99%

Advancing electromagnetic field modeling in axially anisotropic media with conformal method in 3D cylindrical coordinate systems

Tang,

Li,

Chen

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

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A novel Ka-band coaxial transit time oscillator with internal extraction

Gao

Song

Zhang

et al. 2021

Review of Scientific Instruments

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In this paper, a Ka-band coaxial transit time oscillator (TTO) with internal extraction is proposed. Particle-in-cell simulation of this oscillator is performed to obtain results as follows: under the conditions of a diode voltage of 459 kV, current of 3.9 kA, and guiding magnetic field of 0.5 T, microwaves with an output power of 0.75 GW and a frequency of 31.4 GHz can be achieved with an efficiency of 42% and a saturation time of nearly 25 ns. Moreover, the asymmetric mode competition is suppressed in the preliminary experiments. The study of a Ka-band TTO aims to extend the working frequency of high power microwave sources to a higher level. Such a device has three merits. First, it implements high power and high efficiency. Second, the internal extraction of the microwave output decreases the over-mode ratio in the microwave extraction region. Third, the over-mode ratio of the internal extraction is smaller compared with the external extraction, which can effectively suppress asymmetric mode competition.

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High-Order Symmetric and Asymmetric Mode Control in Overmoded Relativistic Backward Oscillator

Qiang

Teng

Zhang³

et al. 2022

IEEE Trans. Electron Devices

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Theoretical and Experimental Studies on the Asymmetric Mode Competition in an OvermodedKa-Band Cerenkov Oscillator

Cited by 4 publications

References 37 publications

Advancing electromagnetic field modeling in axially anisotropic media with conformal method in 3D cylindrical coordinate systems

Advancing electromagnetic field modeling in axially anisotropic media with conformal method in 3D cylindrical coordinate systems

A novel Ka-band coaxial transit time oscillator with internal extraction

High-Order Symmetric and Asymmetric Mode Control in Overmoded Relativistic Backward Oscillator

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