Abstract
Spatial harmonic magnetrons (SHMs) are effective microwave oscillation sources in short millimeter and terahertz regions. This paper presents the development of a miniaturized $W$ -band SHM, which features small size, lightweight, high power, and high reliability. In the design of this SHM, the first backward spatial harmonic wave of $\pi /2 - 1$ mode was used for beam–wave interaction. Then particle-in-cell code was employed to analyze its characteristics, including dispersion, mode separation, field distribution, and electron spokes. Based on the simulation results, a prototype of the miniaturized $W$ -band SHM was fabricated. The test data showed the device was able to deliver an output power of $\sim 2.0$ kW. Note that this magnetron has a dimension of only 36 mm $\times \,\, 36$ mm $\times \,\, 80$ mm and a weight of less than 270 g with magnets.
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