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Cold sintered CaTiO3-K2MoO4 microwave dielectric ceramics for integrated microstrip patch antennas
journal contributionposted on 09.01.2020 by Dawei Wang, Shiyu Zhang, Ge Wang, J. C. Vardaxoglou, William Whittow, Darren Cadman, Di Zhou, Kaixin Song, Ian M Reaney
Any type of content formally published in an academic journal, usually following a peer-review process.
© 2019 Elsevier Ltd CaTiO3-K2MoO4 (CTO-KMO) dielectric composites were successfully cold-sintered at 150 °C for 30 min with a uniaxial pressure of 200 MPa. X-ray diffraction, Raman spectroscopy, back-scattered SEM and energy dispersive x-ray mapping confirmed the coexistence of CTO and KMO with no evidence of interdiffusion and parasitic phases either between the two ceramic end-members or with Ag internal electrodes. As KMO concentration increased, the temperature coefficient of resonant frequency (TCF) and relative pemittivity (εr) decreased but the microwave quality factor (Q × f) increased. A near-zero TCF composition was obtained for CTO-0.92KMO composites which exhibited εr ∼ 8.5 and Q × f ∼ 11,000 GHz. A microstrip patch antenna was designed and fabricated using cold sintered CTO-0.92KMO as a substrate (40×40×1.4 mm), which gave a s11 of −14.2 dB and a radiation efficiency of 62.0 % at 2.51 GHz.
Synthesizing 3D Metamaterials for RF, Microwave and THz Applications EPSRC (EP/N010493/1)
Sustainability and Substitution of Functional Materials and Devices EPSRC (EP/L017563/1)
- Mechanical, Electrical and Manufacturing Engineering