Over the years, microwave-absorbing materials have attracted major interest because of their critical roles in stealth, communication, and information-processing technologies. Advances in nanomaterial functionalization enable tailored dielectric and magnetic properties, with absorption governed by dielectric loss, magnetic loss, and their coupling. The article expounds on measurement principles, encompassing essential analyses, performance assessments, and prevalent interaction pathways like Debye relaxation. Notably, it showcases advancements and evaluates performance in microwave absorption using metal-oxide nanomaterials. This work provides an introduction to the basic principles of microwave absorption and summarizes recent progress in improving the absorption performance of various nanometal oxides.
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