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Cold sintered CaTiO3-K2MoO4 microwave dielectric ceramics for integrated microstrip patch antennas

journal contribution
posted 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
© 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.

Funding

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)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Applied Materials Today

Volume

18

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Applied Materials Today and the definitive published version is available at https://doi.org/10.1016/j.apmt.2019.100519

Acceptance date

26/11/2019

Publication date

2019-12-25

Copyright date

2020

ISSN

2352-9407

eISSN

2352-9407

Language

en

Depositor

Dr Will Whittow Deposit date: 7 January 2020

Article number

100519

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