Researches of Nd(Mg0.5Sn0.5)O3 Microwave Ceramics and Applications in Miniature Chip Antenna

• Main Authors: Ren-jie Tsai, 蔡仁傑
• Other Authors: Yih-Chien Chen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/39574571571219786248

碩士 === 龍華科技大學 === 電機工程研究所 === 99 === In this study, the microwave dielectric properties of Nd(Mg0.5Sn0.5)O3 ceramics were studied. B2O3 and CuO were selected as a liquid sintering aid to reduce the sintering temperature of Nd(Mg0.5Sn0.5)O3 ceramics. Some of the Sn4+ ions were substituted with Ti4+ or Si4+ ions to improve their Q f. A dielectric constant ( ) of 19.1, a quality factor (Q f) of 54,000 GHz, and a temperature coefficient of resonant frequency ( ) of -67 ppm/OC were obtained for Nd(Mg0.5Sn0.47Si0.03)O3 ceramics that were sintered at 1550 OC for 4 h. In the design of chip antenna, the miniature chip antenna was realized on Nd(Mg0.5Sn0.47Si0.03)O3 ceramic substrate. There was a 10 dB return loss bandwidth of 15.08% (5.11 GHz ~ 5.94 GHz). The radiation pattern was ommi-direcational in the xz-plane. The peak gains were about 1.42 and 4.82 dBi in the x-z and y-z planes, respectively.