A novel microwave heating method by which the uniformity and efficiency are effectively enhanced through dual-port phase-difference-shifting feed is proposed. The microwave power is fed into a waveguide from both ports with adjustable phase. Therefore, the phase difference between the dual feed ports can be either fixed or changing during the heating process, resulting in different temperature distribution inside the heated object. A simulation model of such a microwave heating system is built, and the temperature distributions with respect to phase difference are calculated using commercial software COMSOL Multiphysics. A quantitative validation of simulation results has been performed with physical experiments. Both measured and simulated results demonstrate the superiority of phase-difference-shifting heating in uniformity and efficiency, compared to the phase-difference-fixed heating. The uniformity is improved by 39.1% at the same average temperature rise (∆T_av), and the efficiency is increased about 97.8% from the same uniformity point of view.

中文翻译：

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基于双端口移相法的均匀高效微波加热

提出了一种新的微波加热方法，通过双端口移相馈源有效提高均匀性和效率。微波功率从两个相位可调的端口馈入波导。因此，在加热过程中，双进料口之间的相位差可以是固定的，也可以是变化的，从而导致被加热物体内部的温度分布不同。建立了此类微波加热系统的仿真模型，并使用商业软件 COMSOL Multiphysics 计算了相对于相位差的温度分布。已经通过物理实验对模拟结果进行了定量验证。测量和模拟结果都证明了移相加热在均匀性和效率方面的优越性，与相位差固定加热相比。在相同的平均温升 (ΔT _av )，从相同的均匀性角度来看，效率提高了约 97.8%。