%0 Journal Article %A Wang, Dawei %A Zhang, Shiyu %A Wang, Ge %A Vardaxoglou, J. C. %A Whittow, William %A Cadman, Darren %A Zhou, Di %A Song, Kaixin %A Reaney, Ian M %D 2020 %T Cold sintered CaTiO3-K2MoO4 microwave dielectric ceramics for integrated microstrip patch antennas %U https://repository.lboro.ac.uk/articles/journal_contribution/Cold_sintered_CaTiO3-K2MoO4_microwave_dielectric_ceramics_for_integrated_microstrip_patch_antennas/11536950 %2 https://repository.lboro.ac.uk/ndownloader/files/20720391 %K cold sintering %K microwave dielectric ceramics %K microstrip patch antenna %X © 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. %I Loughborough University