Study examines low-permittivity dielectric ceramics for microwave/millimeter-wave communication

https://phys.org/news/2024-05-permittivity-dielectric-ceramics-microwavemillimeter-communication.html

"when using higher frequencies, lightweight, low-dielectric constant and low-loss microwave dielectric ceramics. reduces electromagnetic coupling effects, minimizing signal delay... strongly covalent tetrahedral framework, incorporating low-melting-point LiO2 and rare earth elements achieving high-quality factors...  sintered at temperatures below 950°C, low dielectric constant (5.05–5.26), high-quality factor (41,607–75,968 GHz), low density (3.04–3.26 g/cm3)... prototype microstrip patch antenna... RF devices"