Analysis and Simulations of Electrothermal Characteristics of Water-based Ultrawideband Absorber Using HIE-FVM Hybrid Method

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In this study, the dispersion characteristics, impedance features, and absorption conditions of water-based electromagnetic (EM) absorbers are investigated. A methodology for the rapid construction of a three-layer water-based absorber structure is proposed. Concurrently, a weakly conditionally stable Hybrid Implicit-Explicit Finite Difference Time Domain (HIE-FDTD) method is introduced to enhance the computational efficiency of thin layer structures. Furthermore, the EM computation integrates thermal effect calculations. A hybrid approach, combining the HIE-FDTD and Finite Volume Method (FVM), is employed to analyze temperature variations induced by EM wave incidence on the absorber.