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Abstract
There are many modern day niche applications that may benefit if the output power of several magnetrons is combined together to produce a high power output at microwave frequencies. However, this requires all the magnetrons to be phase-locked to a reference. Phase locking of multiple magnetrons to a reference phase needs careful design, implementation, and considerable hardware. This article presents the design and computational studies on cascaded magnetron topologies, which may reduce the number of phase-locking circuits and power supply units by a factor of two and deliver a high output power. Furthermore, the evolution of output power and efficiency with changes in critical dimensions of the cascaded magnetrons is reported and an attempt is made to provide a qualitative understanding of its working. This article also proposes a new cascaded magnetron structure, which enhances the power output. All simulation studies are carried out for 2.45-GHz magnetron to validate the design. The novel design presented in this article gives a maximum continuous wave (CW) power of around 45 kW with an efficiency of around 49%.
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