Experimental Study of the Effect of the Injection Locking on the Modulation Feature of Magnetron

Zhang, Zihao; Lai, Shimiao; Chen, Haoming; Liu, Zhijun; Zhu, Huacheng; Yang, Yang

doi:10.1109/lmwt.2023.3241192

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…[3]. The injection-locking technology can significantly improve the output characteristics and control the output frequency of a magnetron, thus widening the applications of magnetrons [4][5][6]. Yang et al improved the uniformity of microwave heating using the injection-locked magnetron for sweep frequency output [7].…”

Section: Introductionmentioning

confidence: 99%

Compact Four-Port Waveguide Circulator Using Discrete Ferrites for Injection-Locking Magnetron System

Mi,

Zhao,

Liu

et al. 2024

Electronics

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A compact high-power four-port circulator aiming to simplify the conventional, complex, and bulky injection-locking magnetron system is proposed. To reduce the performance deterioration and the risk of ferrite rupture under long-term high-microwave-power condition, the method of breaking a monolithic ferrite into three discrete ferrites in a conventional three-port circulator is proposed. To miniaturize the size and cost of the four-port circulator, a butterfly-shaped waveguide structure is proposed, with a stub inserted into the cavity at the central point and with no connecting waveguide. Multiphysics simulation results show that the temperature coefficient of variation (COV) at the surface of the discrete ferrites is 12.4% lower than that of a monolithic ferrite circulator, with input microwave power of 10 kW. The size of the proposed four-port waveguide circulator is 27% less than the assembly of two three-port circulators, and way smaller than a conventional differential phase shift circulator (DPSC). The simulated and measured S-parameters match well, and the measured power capacity of the fabricated circulator is higher than 3 kW (limited by the experimental condition). A magnetron is successfully locked using only one designed compact circulator. The research in this paper promotes the development of injection-locking magnetron and provides a design example for the compact, high-power circulator.

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