A new quantitative analysis method for electromagnetic energy dissipation in microwave absorption materials

With the increasing demand for high-frequency electronic devices in wide applications, microwave absorption materials of GHz have attracted extensive attention. In this paper, a new method is provided for quantitative analysis of energy dissipation in the microwave absorption materials. The loss of electromagnetic energy in absorbers can be strictly classified into only two types: magnetic and dielectric loss, and the ratios of the two losses with respect to incident microwave intensity can be accurately evaluated. Moreover, different materials were analyzed with the new method. Notably, both magnetic loss and dielectric loss were found to be important in Sm1.5Y0.5Fe16.5Si0.5/paraffin composite, which can consume up to 88% and 78% of the incident microwave energy under certain conditions, respectively. The fascinating combination of the magnetic loss and the dielectric loss well explained the peculiar two or three peaks in the reflection loss (RL) curves. This analysis method can be a powerful supplement for current theories to explain the microwave absorption property of materials, thus providing a new perspective for the design of high-performance absorption materials.