Development of a new microstrip ferrite coupled lines isolator

Mazur, J.; Kant, Przemysław; Michalski, Jerzy Julian

doi:10.23919/mikon48703.2020.9253769

Cited by 1 publication

(1 citation statement)

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“…Their study shows that the length of the coupling line between the two ferrites strongly affects the performance of the four-port circulator. The other four-port circulators are also designed using ferrite-coupled-lines to achieve high operation band [18,19]. However, these circulators built on PCB substrates cannot achieve high power capacity in kilowa s. In addition, previous research showed that the ferrite temperature in the circulator would rise under the high-microwave-power condition.…”

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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Section: Introductionmentioning

confidence: 99%