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A microwave dielectric material for microstrip patch antenna substrate

Published online by Cambridge University Press:  26 September 2011

Qingwei Liao ,
Lingxia Li ,
Ping Zhang ,
Xiang Ding ,
Xiang Ren  and
Wei Zhang
Qingwei Liao
Affiliation:
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Lingxia Li*
Affiliation:
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Ping Zhang
Affiliation:
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Xiang Ding
Affiliation:
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Xiang Ren
Affiliation:
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Wei Zhang
Affiliation:
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: lilingxia@tju.edu.cn
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Abstract

High quality factor and near-zero temperature coefficient of resonant frequency (τf) are the two key issues for a certain microwave dielectric material system used in microstrip patch antennas. ZnTiO3-based ceramics is a promising candidate for microstrip patch antennas. On inhibiting the decomposition of ZnTiO3 by adding sufficient amount of MgO, high quality factor microwave dielectric material (Zn0.7Mg0.3)TiO3 was obtained. The deviations between theoretical and observed dielectric polarizabilites, the packing fraction, and bond valence were calculated to analyze correlation between structure and properties of (Zn0.7Mg0.3)TiO3. TiO2 was added to adjust τf of (Zn0.7Mg0.3)TiO3, and 0.82(Zn0.7Mg0.3)TiO3–0.18TiO2 with an εr of 28.5, a Qf of 125,050 GHz, and a near-zero τf which satisfied the requirement as a substrate material for microstrip patch antenna was obtained at 1100 °C. In addition, a dielectric microstrip antenna was designed and fabricated using the proposed dielectric materials. The microstrip patch antenna exhibited a −34.96 dB return loss and a 1.05 voltage standing wave ratio at 2.5 GHz.

Keywords

CeramicCrystallographic structureDielectric properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 19 , 14 October 2011 , pp. 2503 - 2510
Copyright
Copyright © Materials Research Society 2011

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