Enhancement the Quality Factor of CaLa₄Ti₅O₁₇ Microwave Ceramics Replacing La³⁺ with Nd³⁺ for Application in Rectenna

Abstract

The microwave dielectric properties of CaLa_(4-x)Nd_xTi₅O₁₇ ceramics were studied with a view to their potential for rectenna. The diffraction peaks of CaLa_(4-x)Nd_xTi₅O₁₇ ceramics nearly unchanged as x increased from 0 to 0.007. The X-ray diffraction peaks of the CaLa_3.995Nd_0.005Ti₅O₁₇ ceramics revealed no significant variation of phase with sintering temperature. A dielectric constant of 57.2, a quality factor (Q × f) of 15700 GHz, and a temperature coefficient of resonant frequency (τ_f ) of −14 ppm/°C were obtained for CaLa_3.995Nd_0.005Ti₅O₁₇ ceramic sintered at 1500°C for 4 h.

Keyworsds:

• CaLa_(4-x)Nd_xTi₅O₁₇
• dielectric constant
• quality factor
• temperature coefficient of resonant frequency.

Acknowledgments

This work was supported by the National Science Council of the Republic of China, Taiwan, under Grant NSC 99-2622-E-262–003-CC3.

Communicated by Dr. George W. Taylor