Study and Application of High Quality Factor Millimeter Wave Dielectric Ceramics

• Main Authors: DU, YUE-XUAN, 杜岳軒
• Other Authors: CHEN, YIH-CHIEN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/4nm58x

碩士 === 龍華科技大學 === 電機工程系碩士班 === 107 === In this study, millimeterwave dielectric properties of (Mg1-xMex)2SnO4(Me=Zn, Co) ceramics were investigated by X-Ray powder diffraction, crystal structure refinement, Raman spectroscopy, and oberserving microstructure. The ceramics were prepared by the conventional solid-state reaction method and sintered at different temperatures. The(Mg0.93Zn0.07)2SnO4 ceramic sintered at 1550 ℃ for 4 h had a dielectric constant of 8.3, a Q×f of 173,000 GHz, and a temperature coefficient of resonant frequency of -68 ppm/℃. The (Mg0.95Co0.05)2SnO4 ceramic sintered at 1550 ℃ for 4 h and had a dielectric constant of 8.3, a Q×f of 120,200 GHz, and a temperature coefficient of resonant frequency of -63 ppm/℃. The chipless temperature antenna sensors were realized on FR4, Al2O3, and (Mg0.93Zn0.07)2SnO4 substrates. The sensitivity of the temperature antenna sensor realized on the (Mg0.93Zn0.07)2SnO4 ceramic substrate was -0.169 MHz/℃. The (Mg0.93Zn0.07)2SnO4 ceramic substrate has a higher working temperature range and frequency resolution than the FR4 substrate. The (Mg0.93Zn0.07)2SnO4 ceramic substrate has higher sensitivity and frequency resolution than the Al2O3 substrate. The millimeter wave microstrip array antenna is fabricated by laser ablation technology, which is realized on FR4 substrate and (Mg0.95Co0.05)2SnO4 ceramic substrate. The process tolerance was less than 6 μm. The resonance frequency, the return loss, the bandwidth, and the bandwidth ratio realized on the FR4 were 24.65 GHz, 38.99 dB, 1.96 GHz (S11<10 dB), and 7.95 %, respectively. The millimeter wave microstrip array antenna realized on (Mg0.95Co0.05)2SnO4. The simulation result of the resonance frequency, the return loss, the bandwidth, the bandwidth ratio realized on (Mg0.95Co0.05)2SnO4 were 24.04 GHz, 15.05 dB, 1.565 GHz (S11<10 dB),and 6.51 %, respectively.