基于渐变折射率超材料的微波单模腔水负载  

Microwave Water Load in Single-Mode Cavity Based on Graded Index Metamaterialsmetamaterial

作　　者：舒蔚君 朱盛颖 朱铧丞 黄卡玛[1] SHU Wei-jun;ZHU Seng-ying;ZHU Hua-cheng;HUANG Ka-ma(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《真空电子技术》2022年第2期72-76,共5页Vacuum Electronics

基　　金：国家自然科学基金项目(61971295)。

摘　　要：针对传统水负载销钉调节复杂、动态调节范围小等问题,提出了基于渐变折射率超材料的高效新型水负载。利用折射率径向连续分布的超材料调控微波,建立了电磁场仿真模型,模拟不同介电常数下水负载吸收微波能的能力。进一步的,基于分层离散方式实现器件的实际制造,设计了由均匀各向同性介质材料交替组成的同心层状结构,于波导内实现了2.45 GHz微波的高效吸收,并制备实验样品进行了对比验证,证实了该吸收器件的高效性,微波能量利用率均达到90%。该方法实现的水负载无需销钉调配,具有较宽的动态调节范围,在温度流速变化而导致的水介电剧变时,仍能实现大功率微波的高效吸收。Aiming at the problems of complex adjustment and small dynamic adjustment range of traditional water load pin,a new efficient water load based on gradient index metamaterials was proposed,in which the microwave was controlled by metamaterials with continuous radial refractive index.An electromagnetic field simulation model was established to simulate the microwave energy absorption ability of water load with different dielectric constants.Based on the layered discrete mode,a concentric layered structure composed of homogeneous isotropic dielectric materials was designed to realize the efficient absorption of 2.45 GHz microwave in the waveguide.Experimental samples were prepared for comparison and verification,which proved the high efficiency of the absorption device and the microwave energy utilization rate of 90%.The water load achieved by this method does not need pin deployment,and has a wide dynamic adjustment range.It can realize high-power microwave absorption even with a great change of water dielectric caused by the change of temperature or flow rate.

关 键 词：水负载 渐变折射率超材料 大功率微波 波导器件 

分 类 号：TN015[电子电信—物理电子学]