An efficient analysis method for nonlinear effects in high-power HTSC planar microwave circuits

Abstract A kind of tapered segmented cladding fiber (T-SCF) with large mode area (LMA) is proposed, and the mode and amplification characteristics of T-SCFs with concave, linear, and convex tapered structures are investigated based on finite-element method (FEM) and few-mode steady-state rate equation. Simulation results indicate that the concave tapered structure can introduce high loss for high-order modes (HOMs) that is advantageous to achieve single-mode operation, whereas the convex tapered structure provides large effective mode area that can help to mitigate nonlinear effects. Meanwhile, the small-to-large amplification scheme shows further advantages on stripping off HOMs, and the large-to-small amplification scheme decreases the heat load density induced by the high-power pump. Moreover, single-mode propagation performance, effective mode area, and heat load density of the T-SCF are superior to those of tapered step index fiber (T-SIF). These theoretical model and numerical results can provide instructive suggestions for designing high-power fiber lasers and amplifiers.

Download Full-text

A Coupling Path Analysis Method for High Power Microwave Interaction With Electronic Systems

IEEE Letters on EMC Practice and Applications ◽

10.1109/lemcpa.2020.3035968 ◽

2021 ◽

Vol 3 (1) ◽

pp. 7-10

Author(s):

Jiangchuan Lin ◽

Gang Zhao

Keyword(s):

Path Analysis ◽

High Power ◽

Electronic Systems ◽

Analysis Method ◽

High Power Microwave ◽

Coupling Path ◽

Power Microwave

Download Full-text

Nonlinear processes in the bunched electron beams of high-power klystrons and the limits of analytical and one-dimensional numerical models applicability for their analysis.

Journal of Radio Electronics ◽

10.30898/1684-1719.2020.12.14 ◽

2020 ◽

Vol 2020 (12) ◽

Author(s):

V.Y. Rodyakin ◽

◽

V.M. Pikunov ◽

V.N. Aksenov ◽

◽

...

Keyword(s):

Electron Beam ◽

High Power ◽

Numerical Models ◽

Nonlinear Effects ◽

Analytical Models ◽

Modulation Amplitude ◽

Two Dimensional ◽

One Dimensional ◽

Charge Parameter ◽

Program Data

We present the results of a comparative theoretical analysis of the electron beam bunching in a single-stage klystron amplifier using analytical models, a one-dimensional disk program, and a two-dimensional program. Data on the influence of various one-dimensional and two-dimensional nonlinear effects on the efficiency of electron beam bunching at different values of the space charge parameter and the modulation amplitude are presented. The limits of applicability of analytical and one-dimensional numerical models for electron beam bunching analysis in high-power klystron amplifiers are found.

Download Full-text

Study on high power microwave nonlinear effects and degradation characteristics of C-band low noise amplifier

Microelectronics Reliability ◽

10.1016/j.microrel.2021.114427 ◽

2022 ◽

Vol 128 ◽

pp. 114427

Author(s):

Li Fuxing ◽

Chai Changchun ◽

Wu Han ◽

Wang Lei ◽

Liang Qishuai ◽

...

Keyword(s):

High Power ◽

Nonlinear Effects ◽

Low Noise ◽

Low Noise Amplifier ◽

High Power Microwave ◽

Noise Amplifier ◽

Power Microwave

Download Full-text

Nonlinear Effects in Microwave Circuits

Introduction to Microwave Circuits ◽

10.1109/9780470545003.ch14 ◽

2009 ◽

Keyword(s):

Nonlinear Effects ◽

Microwave Circuits

Download Full-text

Wideband Gysel HMSIW power divider with high power-handling capability

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078717001568 ◽

2018 ◽

Vol 10 (3) ◽

pp. 308-312

Author(s):

Kaijun Song ◽

Te Kong ◽

Yu Zhu ◽

Hongxing Xu ◽

Lifei Jiang ◽

...

Keyword(s):

High Power ◽

Reasonable Agreement ◽

Impedance Matching ◽

Power Divider ◽

Mode Analysis ◽

Analysis Method ◽

Input Output ◽

Output Impedance ◽

Power Handling ◽

Power Handling Capability

AbstractA novel Gysel power divider with high power-handling capability based on half-mode substrate integrated waveguide (HMSIW) has been presented in this paper. A HMSIW ring is used and good input/output impedance matching is achieved based on HMSIW-microstrip taper transition. Two microstrip stubs are introduced in HMSIW ring to assemble two isolation resistors to improve the isolation between the output ports. The even- and odd-mode analysis method is used for the presented circuit. A prototype of the presented power divider is designed, fabricated, and measured. The measured results show a reasonable agreement with the simulated ones.

Download Full-text