Low-permittivity and high-Q value Li2Mg3Ti1-x(Zn1/3Nb2/3)xO6 microwave dielectric ceramics for microstrip antenna applications in 5G millimeter wave

With the development of 5G technology, millimeter wave communication has gradually attracted the attention of scholars. In order to meet the requirements of wireless communication for transmission rate, the research on millimeter wave microstrip antenna with wider frequency band and more stable gain is in full swing. Therefore, As the key material for microstrip antenna substrate, the performance of microwave dielectric ceramic plays a decisive role. Here, excellent performance microwave dielectric ceramics with low permittivity and high Qxf value were made by replacing Ti4+ of Li2Mg3TiO6 (LMT) system with (Zni(1/3)Nb(2/3))(4+). The phase composition, Raman spectra, micro-structure, bond valence, bond energy and microwave dielectric properties of Li2Mg3Ti1-x (Zni(1/3)Nb(2/3))(x)O-6 (0.02 <= x <= 0.08) ceramics were investigated subsequently. Compared with pure LMT, all samples exhibited lower dielectric constant and higher Qxf value at the same time. In the range of 0.02 <= x <= 0.08, Li2Mg3Ti0.92(Zn1/3Nb2/3)(0.08)O-6 ceramic sintered at 1285 degrees C exhibited the best microwave dielectric property of epsilon(r)similar to 13.28, Qxf similar to 168,911 GHz, tau(f) similar to -42.88 ppm/degrees C. The (r) value of the system was decreased by 12.63%, and the Qxf value was increased by 11.13%, compared with pure LMT. Lower (r) value and higher Qxf value make Li2Mg3Ti0.92(Zn1/3Nb2/3)(0.08)O-6 ceramic become an ideal material for preparing microstrip antennas. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

With the development of 5G technology, the research on millimeter wave communication is gaining more attention. By replacing Ti 4+ of LMT system with (Zni(1/3)Nb(2/3))(4+), excellent performance microwave dielectric ceramics with low permittivity and high Qxf value were made.