本論文首先探討(Mg0.95Co0.05)2(Ti1-xSnx)O4(x = 0.01~0.09)之微波介電特性,由實驗得知(Mg0.95Co0.05)2(Ti0.97Sn0.03)O4在燒結溫度1350℃持溫4小時擁有最佳微波介電特性:ε_r~14.78、Q×f~327,900 GHz、τ_f~-47.07 ppm/℃。為求τ_f~0的要求,添加具有正值共振頻率溫度飄移係數的材料(Ca0.95Sr0.05)(Ti0.97Sn0.03)O3(τ_f~+807.71ppm/℃)由實驗得知0.92(Mg0.95Co0.05)2(Ti0.97Sn0.03)O4-0.08(Ca0.95Sr0.05)(Ti0.97Sn0.03)O3在燒結溫度1325℃時持溫4小時擁有最佳微波特性:ε_r~18.42、Q×f~237,200 GHz、τ_f~3.72ppm/℃。 另外探討Ca5A4(Ti0.95Sn0.05)O17(A=Ta、Nb)由實驗得知在燒結溫度1375℃持溫4小時擁有最佳微波介電特性:ε_r~Ta:72.58、ε_r~Nb:57.407、Q×f~Ta:16400 GHz、Q×f~Nb:10400GHz、τ_f~Ta:195.01 ppm/℃、τ_f~Nb:64.77ppm/℃。CaLa4(Ti0.95Sn0.05)5O17 由實驗得知在燒結溫度1400℃持溫4小時擁有最佳微波介電特性:ε_r~56.11、Q×f~8422 GHz、τ_f~-8.188ppm/℃。CaNd4(Ti0.95Sn0.05)5O17由實驗得知在燒結溫度1425℃持溫4小時擁有最佳微波介電特性:ε_r~42.19、Q×f~4355 GHz、τ_f~-62.81ppm/℃。 此外,本論文以FR-4、Al2O3及自製基板0.92(Mg0.95Co0.05)2(Ti0.97Sn0.03)O4-0.08(Ca0.95Sr0.05)(Ti0.97Sn0.03)O3設計及製作一操作在2.4 GHz的微帶線帶通濾波器。最後量測其頻率響應,由量測結果得到,利用高介電系數及低損耗的材料做為電路基板時,能達到縮小面積以及具有更好的濾波特性。 關鍵字:介電陶瓷、濾波器。
This paper first discusses (Mg0.95Co0.05)2(Ti1-xSnx)O4(x=0.01~0.09) of the microwave dielectric characteristics by experiment that (Mg0.95Co0.05)2 (Ti0.97Sn0.03)O4 holding temperature for 4 hours at a sintering temperature 1350℃ has the best microwave dielectric properties: ε_r~ 14.78, Q×f ~ 327,900 GHz, τ_f ~ -47.07 ppm/℃. For the sake of τ_f requirements to 0, with a value added resonance frequency temperature drift coefficient material (Ca0.95Sr0.05) (Ti0.97Sn0.03) O3 (τ_f ~ + 807.71 ppm/℃) experimentally that 0.92 (Mg0.95Co0.05)2(Ti0.97Sn0.03)O4-0.08(Ca0.95Sr0.05)(Ti0.97Sn0.03)O3 at a sintering temperature 1325℃ holding temperature at 4 hours with the best microwave characteristics: ε_r ~ 18.42 , Q×f ~ 237,200 GHz, τ_f~ 3.72 ppm/℃. Further Discussion Ca5A4 (Ti0.95Sn0.05)O17(A = Ta, Nb) held by the experiment that the sintering temperature of 1375℃ temperature four hours with the best microwave dielectric properties: ε_r ~ Ta: 72.58, ε_r ~ Nb: 57.407 , Q×f ~ Ta: 16400 GHz, Q×f ~ Nb: 10400GHz, τ_f~ Ta: 195.01 ppm/℃, τ_f~ Nb: 64.77 ppm/℃. CaLa4 (Ti0.95Sn0.05)5O17 experimentally that holding temperature four hours with the best microwave dielectric properties at a sintering temperature 1400℃: ε_r~ 56.11, Q×f ~ 8422 GHz, τ_f ~ -8.188 ppm/℃. CaNd4 (Ti0.95Sn0.05)5O17 experimentally that holding temperature four hours with the best microwave dielectric properties at a sintering temperature 1425℃: ε_r ~ 42.19, Q×f ~ 4355 GHz, τ_f~ -62.81 ppm/℃. In addition, the paper FR-4, Al2O3 and homemade board 0.92 (Mg0.95Co0.05)2 (Ti0.97Sn0.03)O4-0.08(Ca0.95Sr0.05)(Ti0.97Sn0.03)O3design and production an operation in the 2.4 GHz microstrip bandpass filter. When the last measured frequency response, obtained from the measurement results, the use of high dielectric constant and low loss material used as the circuit board area reduction and to achieve better filtering characteristics. Keywords: dielectric ceramic 、filter.
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