Search

As a clean energy, microwaves have been widely used in thermal engineering. However, in the traditional microwave heating process, it is difficult to obtain high heating efficiency and uniformity. ...

The reflection coefficients from a gold-plated coaxial line probe submerged in different electrolyte aqueous solutions are measured under different microwave powers and constant temperature. Measurements were performed at 915 MHz. Furthermore, a GA-based inverse calculation technique was formulated and used to determine the effective conductivity of the solution from the measured reflection coefficients. A new phenomenon was observed: the effective conductivity of electrolyte aqueous solutions can be directly influenced by microwave power. Any thermal effect was excluded using multiphysics calculation and temperature measurement during the experiment for sodium chloride aqueous solution. Therefore, it was concluded that nonthermal effect of sodium chloride aqueous solution under microwave radiation exists. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:222–225, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26500

A microwave power-combining system composed of two Panasonic 2M244-M1 magnetrons based on master–slave injection-locking is demonstrated in this paper. The principle of master–slave injection-locking and the locking condition are theoretical analyzed. Experimental results are consistent with the theoretical analysis and the experimental combined efficiency is higher than 96%. Compared with the external-injection-locked system, the power-combining based on the master–slave injection-locking magnetron is superior by taking out the external solid-state driver and the real-time phase control system. Thus, this power-combining system has great potential for obtaining a high efficiency, high stability, low cost, and high power microwave source.