Investigation of the microwave dielectric properties of Ca1−xMgxLa4Ti5O17 ceramics for application in coplanar patch antenna |
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Authors: | Yih-Chien Chen Shi-Li Yao Ren-Jie Tsai Kuei-Chien Chen |
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Affiliation: | aDepartment of Electrical Engineering, Lunghwa University of Science and Technology, Gueishan Shiang, Taoyuan County, Taiwan |
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Abstract: | In this paper, the dielectric properties of Ca1−xMgxLa4Ti5O17 ceramics at microwave frequency have been studied. The diffraction peaks of Ca(1−x)MgxLa4Ti5O17 ceramics nearly unchanged with x increasing from 0 to 0.03. Similar X-ray diffraction peaks of Ca0.99Mg0.01La4Ti5O17 ceramic were observed at different sintering temperatures. A maximum density of 5.3 g/cm3 can be obtained for Ca0.99Mg0.01La4Ti5O17 ceramic sintered at 1500 °C for 4 h. A maximum dielectric constant ( r) and quality factor (Q × f) of Ca0.99Mg0.01La4Ti5O17 ceramic sintered at 1500 °C for 4 h are 56.3 and 12,300 GHz (at 6.4 GHz), respectively. A near-zero temperature coefficient of resonant frequency (τf) of −9.6 ppm/°C can be obtained for Ca0.99Mg0.01La4Ti5O17 ceramic sintered at 1500 °C for 4 h. The measurement results for the aperture-coupled coplanar patch antenna at 2.5 GHz are presented. With this technique, a 3.33% bandwidth (return loss <−10 dB) with a center frequency at approximately 2.5 GHz has been successfully achieved. |
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Keywords: | Ca1− xMgxLa4Ti5O17 X-ray diffraction pattern Dielectric constant Quality factor Temperature coefficient of resonant frequency |
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