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为了提高BaO-TiO2-Sm2O3介电陶瓷的温度稳定性,对其进行了改性研究。该陶瓷采用固相法制备粉料,XRD和SEM分析其晶相组成和显微结构,采用Sr2+和Nd3+分别取代Ba2+和Sm3+调节其频率温度系数。当Sr2+∶Ba2+=5∶95(mol),Nd3+∶Sm3+=8∶2(mol)时,获得了介电常数为80、频率温度系数接近0ppm/℃、Q.f≥8000GHz的微波介质陶瓷。用该陶瓷制作了中心频率1005MHz的4腔一体化结构的带通滤波器,Δf3dB=29MHz,插入损耗小于2 dB。滤波器经过高温、低温和温度冲击试验后,频率温度系数最大为8.28 ppm/℃,满足通信设备的要求。
In order to improve the temperature stability of BaO-TiO2-Sm2O3 dielectric ceramic, the modification was studied. The ceramic powder was prepared by solid state method. The crystal phase composition and microstructure were analyzed by XRD and SEM. The temperature coefficients of Ba2 + and Sm3 + were replaced by Sr2 + and Nd3 + respectively. When Sr2 +: Ba2 + = 5:95 (mol), Nd3 +: Sm3 + = 8: 2 (mol), the microwave dielectric ceramics with dielectric constant of 80, frequency temperature coefficient close to 0ppm / ℃ and Q.f≥8000GHz were obtained. A 4-cavity integrated bandpass filter with a center frequency of 1005 MHz was fabricated using this ceramic with Δf3dB = 29 MHz and insertion loss of less than 2 dB. Filter after high temperature, low temperature and temperature impact test, the frequency coefficient of maximum temperature of 8.28 ppm / ℃, to meet the requirements of communications equipment.