Fabrication and Study of Novel CaTiO3-based Microwave Dielectric Materials and Its Applications on Antenna

• Main Authors: Chia-Hao Chang, 張家豪
• Other Authors: Cheng-Hsing Hsu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/22574379625371649955

碩士 === 國立聯合大學 === 電機工程學系碩士班 === 99 === The microwave dielectric properties of (Ca0.8Sr0.2)(MxTi(1-x))O3 (M = Zr, Sn) ceramics with different x values have been studied. On the other hand, due to MgTiO3 (εr ~17, Q×f ~160,000GHz, τf ~-50 ppm/oC) and (Ca0.8Sr0.2)(Zr0.1Ti0.9)O3 (εr ~178, Q×f ~5700GHz, τf ~913 ppm/oC) have good dielectric properties, (Ca0.8Sr0.2)(Zr0.1Ti0.9)O3, having a larger positive τf, was selected as a compensator and added to MgTiO3 to form a near-zero τf ceramic system (1-x)(MgTiO3)-(x)(Ca0.8Sr0.2)(Zr0.1Ti0.9)O3. The experimental results show that the excellent microwave dielectric properties (εr ~22, Q×f value ~ 120,000GHz and τf value ~-5.6ppm/oC) can be obtained for 0.95(MgTiO3)-0.05(Ca0.8Sr0.2)(Zr0.1Ti0.9)O3 sintered at 1300 oC for 4 h. Finally, a monopole Ultra-wideband (UWB) antenna has been designed and fabricated by using 0.95(MgTiO3)-0.05(Ca0.8Sr0.2)(Zr0.1Ti0.9)O3 ceramic and FR4 substrates, respectively.