A high efficiency and low noise magnetron cathode using gallium nitride and silicon carbide polymers for modulated microwave power transmission / Leong Wen Chek

Leong , Wen Chek (2022) A high efficiency and low noise magnetron cathode using gallium nitride and silicon carbide polymers for modulated microwave power transmission / Leong Wen Chek. PhD thesis, Universiti Malaya.

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Abstract

Microwave Power Transmission is one of the potential fantastic technologies in Wireless Power Transmission apart from Inductive Coupling, Resonant Inductive Coupling, Capacitive Coupling, Magnetic Resonant, Radio Frequency, Laser Power and Laser Light Wireless Power Transmission. Microwave Power Transmission performs better for low power applications due to its far-field transmission distance. However, due to safety and health concerns, the research on Microwave Power Transmission has been reduced and requires high costs to conduct the experimental investigation. The Magnetron is one of the most commonly used microwave power generators for commercial or industrial applications. The system's efficiency is mainly affected by factors such as the building materials, resonant cavity size, operation space size, anode structure, and operating frequency. Previous researchers have emphasized implementing GaN on SiC polymer in various power device applications such as high electron-mobility transistors, power diodes, and microwaves. However, the solution proposed in this thesis is the first reported for implementing the same polymer in a magnetron’s cathode surface. This thesis proposes the modification of magnetron cathode for high frequency and low power applications using Silicon Carbide (SiC) and Gallium Nitride (GaN) coated cathode polymer replacing traditional Barium Oxide (BaO) substrate through an annealing process. The highlighted optimization is intended to modify the control of magnetron electron flow velocity to reduce heat dissipation. Sudden temperature rise during magnetron operation reduces its efficiency because it loses its stability. Simulation and experimental results have been extracted at 2,45MHz to generate 5W microwave power and tested for over 10 m. of power transmission using a rectenna interface, which results in an efficiency of 87%, compared to 36% using a BaO coat.

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