Sustainable design and advanced modelling of alumina-based microstrip structures for energy-efficient high-frequency applicationsMeta Yantidewi, Dzulkiflih, Muhimmatul Khoiro, Endah Rahmawati, Rohim A. Firdaus and Amelia P. RistyawardaniE3S Web Conf., 696 (2026) 01025DOI: https://doi.org/10.1051/e3sconf/202669601025