Abstract
In this article, we present a new microwave system with the tunable ability of the heating region and heating effect. The heating region is changed by choosing different antennas above different heating region, which leads to larger heating range. And this system can be utilized in precise temperature control in ammonia synthesis phase. The frequency-space domain modulation technology is ingeniously suggested in our heating system. The different antennas above different heating region is then selected by changing the input working frequency. Based on the frequency-space domain modulation, we further add time domain modulation to increase the tunability of heating effect at different heating regions. By adjusting the frequency distribution of the input microwave source in time domain, where we named as time-frequency-space domain synthesis modulation method, the tunable heating region and effect is finally achieved. A simple microwave system is fabricated, and different heating effects are measured. The proposed heating method and system has benefits as following, simple structure, low cost, uniform heating, and controllable heating effect, which results in great improvement in microwave heating.
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