Numerical Investigation of Metasurfaces Based on TransformationOptics for Microwave Heating
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Author NameAffiliation
XIAO Wei1,LIAO Yin-hong2,WANG Feng-xia3,HUANG Ka-ma4,ZHU Hua-cheng4 1. College of Big Data and Information Engineering, Guizhou University,Guiyang 550025, China
2. College of Electronics and Information Engineering, Southwest University, Chongqing 400715, China
3. State Key Laboratory of Efficient Utilization for Low Grade Phosphate Rock and Its Associated Resources, Wengfu Group, Guiyang 550014, China
 4. College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China 
Fund Project:贵州省科技计划项目(黔科合基础-ZK[2021]一般298);中低品位磷矿及其共伴生资源高效利用国家重点 实验室开放基金课题(WFKF2020-09)
Abstract:Due to the power limitation of single microwave source, the multi-source microwave heating is widely adopted in high-power industrial applications. However, the additional microwave feeding ports will increase the port-to-port power coupling, which may damage the microwave sources. In this paper, a novel kind of metasurfaces based on transformation optics is proposed to decrease the power reflection and coupling by transmitting the microwave in the direction of entering the microwave applicator but blocking it in the reverse direction. In the two dimensional numerical model, the dielectric properties of the metasurfaces are optimized by the back propagation neural network and the energy efficiency can be improved by 42. 2% and 53. 3% in the single and dual-port microwave applicators, respectively, both of which have good heating uniformity. The numerical calculation results show that the metasurfaces can work well at 2. 45 GHz with a bandwidth of 60 MHz, which has beneficial industrial application prospects.
keywords:metasurfaces, transformation optics, microwave heating, back propagation neural network
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