具有宽带宽和高吸收率的微波吸收材料在空中(OTA)测试中发挥着越来越重要的作用。在这项工作中,以阻燃吸收剂为填料,制备了一种金字塔吸波材料。此外,为了进一步提高吸波材料的阻燃性能,采用了涂层。为了获得优异的微波吸收性能(MWAP),采用高频结构模拟器(HFSS)设计结构材料。这里,总高度,基础高度,金字塔顶端的斩首高度,金字塔之间的距离,和其他参数进行了分析;然后,实现了实际加工成型。-30dB的MWAP在2.7-18GHz实现,和-10dB的MWAP也满足在2-18GHz。特别是,该研究还研究了大角度的MWAP,可以满足2-18GHz-10dB的MWAP和4-18GHz-30dB的MWAP。最重要的是,探讨了金字塔结构的吸收机理。通过金字塔中电磁场的分布证明了尖端的影响。由于金字塔的阻抗梯度,它可以被视为多层微波吸收材料,为今后的工程应用提供了有效的研究思路和方法。
Microwave-absorbing materials with wide bandwidth and high absorptivity are increasingly playing an important role in over-the-air (OTA) testing. In this work, a kind of pyramid absorbing material was prepared using flame-retardant absorbers as the filler. In addition, a coating was used to further improve the flame-retardant properties of the microwave-absorbing material. To obtain excellent microwave absorption performance (MWAP), a high-frequency structure simulator (HFSS) was adopted to design structural materials. Here, the total height, the base height, the decapitation height of the pyramid tip, the distance between the pyramids, and other parameters were analyzed; then, the actual processing and molding were realized. The MWAP of -30 dB was achieved at 2.7-18 GHz, and the MWAP of -10 dB was also met at 2-18 GHz. In particular, the study also investigated the MWAP of large angle, which can meet the MWAP of -10 dB at 2-18 GHz and MWAP of -30 dB at 4-18 GHz. Most importantly, the absorption mechanism of the pyramid structure was explored. The influence of the tip was proved by the distribution of the electromagnetic field in the pyramid. It can be regarded as a multilayer microwave-absorbing material due to the impedance gradient of the pyramid, which can provide an effective research idea and method for future engineering applications.