Enabling High-Efficiency Vortex Beam Generation via (Li_0.5Sm_0.5)²⁺-Enhanced Calcium Molybdate Low-Temperature Cofired...

Existing spectrum resources can hardly meet the rate and capacity requirements of communication systems, so there is an urgent need to break through these barriers. In order to address the problem in a targeted manner, a novel Ca_0.88(Li_0.5Sm_0.5)_0.12MoO₄ ceramic material with excellent microwave dielectric properties (ε_r = 11.3, Q×f = 41,625 GHz, τ_f = -23.8 ppm/°C) sintered at 950 °C is prepared by the solid-state reaction. The relationships between microwave dielectric properties and microstructure, electronic structure, and lattice vibrations are established through first-principles calculations, Raman spectroscopy, and fundamental characterization. Using this ceramic and silver electrode, an array device for generating vortex beams has been designed and demonstrated. The radiation efficiencies exceed 0.9 and the radiation phase covers 360°. The device converts plane waves into vortex waves with remarkable results and has the opportunity to significantly increase the capacity and efficiency of communications. This functionality is verified by far-field intensity and phase distributions. This work provides new ideas for the design of LTCC devices and broadens the application of microwave dielectric ceramics.