Broadband electromagnetic absorption up to 1473 K enabled by dielectric frequency-dispersion engineering in ceramic composites.

ABSTRACT: Rising vehicle Mach numbers urgently necessitate broadband electromagnetic wave (EMW) absorbers capable of operating at even higher temperatures while maintaining environmental durability. However, Current high-temperature EMW absorbing materials face the restriction and temperature-sensitivity of dielectric frequency-dispersion (FD), which often forces reliance on complex macro-structures to broaden effective absorption bandwidth (EAB). Here, inspired by the concept of finite element method, we propose a controlled FD regulation strategy to overcome this by employing multivariate ultra-high temperature ceramic (UHTC) borides with tunable surface oxide thickness. The fabricated material (without structural design) yields a broad EAB of 26.98 GHz at just 2.8 mm thickness, alongside environm

SUBMITTER: Ren B 

PROVIDER: S-EPMC12789549 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature