“…One kind of them is the continuous silicon carbon (SiC) fiber-reinforced SiC matrix (SiC f /SiC) composite, which is a promising material for high-temperature structural applications, in part because of their superior properties, such as the high strength at elevated temperatures, the oxidation resistance, and the microstructural stability under neuron irradiation [1][2][3]. They are known to be a key material for components of aircraft engine hot-section components and fusion reactors [4][5][6][7][8]. Moreover, due to their excellent semi-conductivity and relatively stable dielectric characteristics at elevated temperature, they have also been showing many practical and potential applications in high temperature microwave absorption [9][10][11], for which the hightemperature complex permittivity is one of the most important parameters.…”