Low permittivity cordierite-based microwave dielectric ceramics for 5G/6G telecommunications

5G and forthcoming 6G communication systems require dielectric ceramics with low relative permittivity (epsilon(r)) and near-zero temperature coefficient of resonant frequency (tau(f)) for the lower part of the microwave (MW) band and at sub-Terahertz. Mg2Al4Si5O18 (MAS) ceramics are promising candidates due to their low epsilon(r) (-6) and high-quality factor (Qxf > 40,000 GHz) but have a large tau(f). In this study, 5.5 wt% TiO2 (MAS-T-5.5) was used to adjust tau(f) of MAS to-2.8 ppm/celcius whilst retaining low epsilon(r) (5.24) and good Qxf (33,400 GHz), properties consistent with those obtained by infrared reflectance. A demonstrator microstrip patch antenna with gain 4.92 dBi and 76.3% efficiency was fabricated from MAS-T-5.5.

Automated summary

This study adjusts the temperature coefficient of resonant frequency of Mg2Al4Si5O18 ceramics using 5.5 wt% TiO2, while maintaining low relative permittivity and good properties. A demonstrator antenna made from the adjusted material exhibits high gain and efficiency.