TY - JOUR
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
N1 - Funding Information:
This work was supported by the National Science Council of the Republic of China under Grant NSC 96-2221-E-006-117.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
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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U2 - 10.1016/j.jallcom.2008.01.015
DO - 10.1016/j.jallcom.2008.01.015
M3 - Letter
AN - SCOPUS:58049208187
VL - 468
SP - L13-L16
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
SN - 0925-8388
IS - 1-2
ER -