High dielectric constant low loss in the (La1/2Na1/2)TiO3-Ca(Mg1/3Nb2/3)O3 ceramic system at microwave frequency

Cheng Liang Huang; Shih Sheng Liu; Chung Chin Chen

doi:10.1016/j.jallcom.2008.01.015

High dielectric constant low loss in the (La_1/2Na_1/2)TiO₃-Ca(Mg_1/3Nb_2/3)O₃ ceramic system at microwave frequency

Cheng Liang Huang, Shih Sheng Liu, Chung Chin Chen

Department of Electrical Engineering

Research output: Contribution to journal › Letter

4 Citations (Scopus)

Abstract

The crystal structures and microwave dielectric properties of the x(La_1/2Na_1/2)TiO₃-(1 - x)Ca(Mg_1/3Nb_2/3)O₃ perovskite ceramic system were investigated. The x(La_1/2Na_1/2)TiO₃-(1 - x)Ca(Mg_1/3Nb_2/3)O₃ solid solution exhibited orthorhombic crystal structures for all compositions. As the x value increased from 0.2 to 0.8, the dielectric constant ε_r increased from 38.24 to 96 and the unloaded quality value Q × f decreased from 42,500 to 12,800 GHz. The temperature coefficient of the resonant frequency (τ_f) varied from -20 to 138 ppm/°C as the x value increased from 0.2 to 0.8. A new microwave dielectric material, 0.4(La_1/2Na_1/2)TiO₃-0.6Ca(Mg_1/3Nb_2/3)O₃, is suggested for microwave devices, having a dielectric constant ε_r of ∼52.33, a Q × f value of ∼29,700 (at 6.0 GHz), and a τ_f value of ∼2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.

Original language	English
Pages (from-to)	L13-L16
Journal	Journal of Alloys and Compounds
Volume	468
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2008.01.015
Publication status	Published - 2009 Jan 22

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2008.01.015

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Huang, C. L., Liu, S. S., & Chen, C. C. (2009). High dielectric constant low loss in the (La_1/2Na_1/2)TiO₃-Ca(Mg_1/3Nb_2/3)O₃ ceramic system at microwave frequency. Journal of Alloys and Compounds, 468(1-2), L13-L16. https://doi.org/10.1016/j.jallcom.2008.01.015

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title = "High dielectric constant low loss in the (La1/2Na1/2)TiO3-Ca(Mg1/3Nb2/3)O3 ceramic system at microwave frequency",

abstract = "The crystal structures and microwave dielectric properties of the x(La1/2Na1/2)TiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 perovskite ceramic system were investigated. The x(La1/2Na1/2)TiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 solid solution exhibited orthorhombic crystal structures for all compositions. As the x value increased from 0.2 to 0.8, the dielectric constant εr increased from 38.24 to 96 and the unloaded quality value Q × f decreased from 42,500 to 12,800 GHz. The temperature coefficient of the resonant frequency (τf) varied from -20 to 138 ppm/°C as the x value increased from 0.2 to 0.8. A new microwave dielectric material, 0.4(La1/2Na1/2)TiO3-0.6Ca(Mg1/3Nb2/3)O3, is suggested for microwave devices, having a dielectric constant εr of ∼52.33, a Q × f value of ∼29,700 (at 6.0 GHz), and a τf value of ∼2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.",

author = "Huang, {Cheng Liang} and Liu, {Shih Sheng} and Chen, {Chung Chin}",

year = "2009",

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T1 - High dielectric constant low loss in the (La1/2Na1/2)TiO3-Ca(Mg1/3Nb2/3)O3 ceramic system at microwave frequency

AU - Huang, Cheng Liang

AU - Liu, Shih Sheng

AU - Chen, Chung Chin

PY - 2009/1/22

Y1 - 2009/1/22

N2 - The crystal structures and microwave dielectric properties of the x(La1/2Na1/2)TiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 perovskite ceramic system were investigated. The x(La1/2Na1/2)TiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 solid solution exhibited orthorhombic crystal structures for all compositions. As the x value increased from 0.2 to 0.8, the dielectric constant εr increased from 38.24 to 96 and the unloaded quality value Q × f decreased from 42,500 to 12,800 GHz. The temperature coefficient of the resonant frequency (τf) varied from -20 to 138 ppm/°C as the x value increased from 0.2 to 0.8. A new microwave dielectric material, 0.4(La1/2Na1/2)TiO3-0.6Ca(Mg1/3Nb2/3)O3, is suggested for microwave devices, having a dielectric constant εr of ∼52.33, a Q × f value of ∼29,700 (at 6.0 GHz), and a τf value of ∼2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.

AB - The crystal structures and microwave dielectric properties of the x(La1/2Na1/2)TiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 perovskite ceramic system were investigated. The x(La1/2Na1/2)TiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 solid solution exhibited orthorhombic crystal structures for all compositions. As the x value increased from 0.2 to 0.8, the dielectric constant εr increased from 38.24 to 96 and the unloaded quality value Q × f decreased from 42,500 to 12,800 GHz. The temperature coefficient of the resonant frequency (τf) varied from -20 to 138 ppm/°C as the x value increased from 0.2 to 0.8. A new microwave dielectric material, 0.4(La1/2Na1/2)TiO3-0.6Ca(Mg1/3Nb2/3)O3, is suggested for microwave devices, having a dielectric constant εr of ∼52.33, a Q × f value of ∼29,700 (at 6.0 GHz), and a τf value of ∼2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.

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