Abstract

This study discusses development of a microwave-heated thin-panel metamaterial absorber (MA) for application in aircraft deicing. The base of the MA was selected to be high-silica glass cloth reinforced polyimide (GCRP), manufactured through the autoclave process. The material’s surfaces were sprayed with metal powder as per the absorber design. In simulation with an optimized parameter set, the MA had a minimum reflectivity of −35 dB at 2.45 GHz. Two rounds of microwave heating experiments were conducted, studying different MA designs. In the first round of experiments, conducted in a stainless-steel mesh chamber, the minimum reflectivity of the first six samples tested, observed at 2.45 GHz, was approximately −5 dB. The accompanying thermal images indicate that the MA is heated periodically, according to the spatial distribution of the electromagnetic field, with an overall heating rate of approximately 0.001 °C/s/W. Clearer thermal images were obtained in the second round of experiments, conducted in a microwave anechoic chamber, where a heating rate of 0.01 °C/s/W was observed near the new MA’s resonant frequency of 2.28 GHz. At this frequency, the MA’s reflectivity was −7.63 dB. These results indicate that the developed MA has potential for application in aircraft deicing.

摘要

本研究讨论了用于飞机除冰的微波加热薄板超材料吸收器 (MA) 的开发。MA 的底座被选择为通过高压釜工艺制造的高硅玻璃布增强聚酰亚胺 (GCRP)。根据吸收器设计，材料的表面喷有金属粉末。在使用优化参数集进行的仿真中，MA 在 2.45 GHz 处具有 -35 dB 的最小反射率。进行了两轮微波加热实验，研究了不同的 MA 设计。在第一轮实验中，在不锈钢网室中进行，在 2.45 GHz 下观察到的前六个测试样品的最小反射率约为 -5 dB。随附的热图像表明 MA 被周期性加热，根据电磁场的空间分布，整体加热速率约为 0.001 °C/s/W。在第二轮实验中获得了更清晰的热图像，在微波消声室中进行，在新 MA 的 2.28 GHz 谐振频率附近观察到 0.01 °C/s/W 的加热速率。在该频率下，MA 的反射率为 -7.63 dB。这些结果表明开发的 MA 具有应用于飞机除冰的潜力。