Effects of partial substitution at different sites on the microwave dielectric properties of K2Co2(MoO4)3 ceramic and its applications as a 5G/6G antenna array

Zong Ying Li, I. Chun Ling, Tsung Hsien Hsu, Cheng Liang Huang

Research output: Contribution to journalArticlepeer-review

Abstract

Novel K2Co2(MoO4)3 microwave dielectric materials were prepared and investigated for the first time. The effects of substituting Ag+ for K+ and Zn2+ for Co2+ on the ceramic structure, sintering temperature, surface microstructure, and microwave dielectric properties were studied. The X-ray diffraction results showed that the samples had a monoclinic crystal structure and belonged to the P121/c1 (14) space group, with a single-phase composition of K2Co2(MoO4)3. The pure phase K2Co2(MoO4)3 ceramic achieved a Q × f = 42,300 GHz, an ε r = 7.31, and a τf = − 81.3 ppm/°C at a sintering temperature of 630 °C. Partial substitution in the specimen can effectively enhance its densification and reduce the dielectric loss, particularly at the K-site. This improvement is primarily attributed to the more significant variation in the cell volume of the ceramics. The K2Co1.9Zn0.1(MoO4)3 specimen with minute substitution achieved Q × f = 57,300 GHz, ε r = 7.82 and τf = − 69 ppm/°C at 630 °C, while the K1.86Ag0.14Co2(MoO4)3 specimen showed Q × f = 61,200 GHz, ε r = 8.73 and τf = − 68 ppm/°C at 540 °C. The research also exhibited that the material had outstanding chemical compatibility with aluminum electrodes during co-firing. Based on the results, these ceramics show potential as attractive candidates for ULTCC applications, such as an 8 × 8 dual-polarization antenna array used in the millimeter-wave region for 5G/6G systems.

Original languageEnglish
Article number2045
JournalJournal of Materials Science: Materials in Electronics
Volume34
Issue number30
DOIs
Publication statusPublished - 2023 Oct

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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