Microwave absorbing materials have become an important component in electronics, communication, and modern warfare. The present study reports porous activated carbon derived from mango leaves biomass and by facile method of carbonization and activation. The porous activated carbon has the potential to become an efficient microwave absorbing material. The SEM and FESEM images clearly showed the porous structure which was further confirmed using BET analysis. The sample having 20 wt% loading of activated carbon in paraffin wax gave the Highest Reflection Loss (RL_max) of −23.26 dB at 17.68 GHz & 1.50 mm thickness. The maximum effective absorption band width (i.e. reflection loss < −10 dB) of 5.17 GHz was obtained at 1.75 mm thickness, which covered 86.16% of Ku band. The effective absorption bandwidth of 3.31 GHz was also obtained at 2.5 mm thickness which covered 82.75% of X band. This excellent microwave absorption property was obtained by high impedance matching and subsequent attenuation of microwave by dielectric loss facilitated by the porous structure. This work provides a new source of biomass which is abundant in nature and can be easily processed as an enhanced microwave absorbing material having large effective absorption bandwidth at less thickness and low filler loading.

吸波材料已经成为电子，通信和现代战争中的重要组成部分。本研究报告了源自芒果叶生物量并通过简便的碳化和活化方法获得的多孔活性炭。多孔活性炭具有成为有效的微波吸收材料的潜力。SEM和FESEM图像清楚地显示出多孔结构，其通过BET分析进一步证实。活性炭在石蜡中的负载量为20 wt％的样品具有最高的反射损耗（RL _max）在23.68 GHz和1.50 mm厚度时为−23.26 dB。在1.75 mm的厚度下获得了5.17 GHz的最大有效吸收带宽（即反射损耗<-10 dB），覆盖了Ku频段的86.16％。在2.5mm的厚度下也获得了3.31 GHz的有效吸收带宽，覆盖了X波段的82.75％。这种优异的微波吸收性能是通过高阻抗匹配以及随后由于多孔结构促进的介电损耗而使微波衰减而获得的。这项工作提供了一种自然界中丰富的新生物质来源，可以容易地作为增强的微波吸收材料进行加工，该微波吸收材料在较小的厚度和较低的填料载荷下具有较大的有效吸收带宽。