Direct Integration of Cold Sintered, Temperature-Stable Bi2Mo2O9-K2MoO4 Ceramics on Printed Circuit Boards for Satellite Navigation Antennas

Wang, Dawei; Siame, Beatia; Zhang, Shiyu; Wang, Ge; Ju, Xingshen; Li, Jinglei; Lu, Zhilun; Vardaxoglou, Yiannis; Whittow, Will; Cadman, Darren; Sun, Shikuan; Zhou, Di; Song, Kaixin; Reaney, Ian M.

Abstract

Bi2Mo2O9-K2MoO4 (BMO-KMO) composite ceramics with >95% theoretical density were densified by cold sintering at 150 °C. XRD, Raman, back-scattered SEM and EDX spectroscopy indicated that the BMO and KMO phases coexisted in all composites without inter-diffusion and secondary phases. Temperature coefficient of resonant frequency with near-zero value ∼ -1 ppm/°C was acheived for BMO-10%KMO with pemittivity ∼ 31 and quality factor ∼ 3,000 GHz. Cold-sintered composite ceramics were directly pressed/integrated onto a printed circuit board (PCB) using the Cu metallisation as a ground plane for the design and fabrication of a circularly polarized microstrip patch antenna suitable for satellite navigation systems which achieved efficiencies 87% at 1561 MHz (BeiDou) and 88% at 1575 MHz (GPS/Galileo). The low cost, low energy integration of temperature stable, cold sintered ceramics directly onto a PCB represents a step change in substrate fabrication technology for RF devices.

Citation

Wang, D., Siame, B., Zhang, S., Wang, G., Ju, X., Li, J., Lu, Z., Vardaxoglou, Y., Whittow, W., Cadman, D., Sun, S., Zhou, D., Song, K., & Reaney, I. M. (2020). Direct Integration of Cold Sintered, Temperature-Stable Bi2Mo2O9-K2MoO4 Ceramics on Printed Circuit Boards for Satellite Navigation Antennas. Journal of the European Ceramic Society, 40(12), 4029-4034. https://doi.org/10.1016/j.jeurceramsoc.2020.04.025

• Journal Article Type: Article
• Acceptance Date: Apr 16, 2021
• Online Publication Date: Apr 21, 2020
• Publication Date: 2020-09
• Deposit Date: Oct 23, 2021
• Journal: Journal of the European Ceramic Society
• Print ISSN: 0955-2219
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 40
• Issue: 12
• Pages: 4029-4034
• DOI: https://doi.org/10.1016/j.jeurceramsoc.2020.04.025
• Keywords: microwave dielectric ceramics, cold sintering process, microstrip patch antennas
• Public URL: http://researchrepository.napier.ac.uk/Output/2815595