Title :
Ba(Co,Nb)O3-based ceramics for super high frequency dielectric filter
Author :
Arai, Toru ; Ono, Hideki ; Ayusawa, Kazutoshi
Author_Institution :
Lab. of Microsyst. Technol., Oki Electr. Ind. Co. Ltd., Tokyo, Japan
Abstract :
We have developed a highly temperature stable low-loss ceramic based on Ba(Co,Nb)O3. We optimized the amount of barium in Ba(Co,Nb)O3 ceramic and added TiO2 to Ba(Co,Nb)O 3 ceramic to make the temperature coefficient of the resonant frequency of Ba(Co,Nb)O3-based ceramic close to 0 ppm/°C with low dielectric loss. When the amount of barium in Bax(Co 1/3Nb2/3)O3 was 1.03 mol, the Q attained the maximum value of 14500. The temperature coefficient of resonant frequency (τf) could be controlled by varying the amount of TiO2 addition. When the amount of TiO2 addition was 0.025 mol, the τf became 0 ppm/°C. We constructed a super high frequency dielectric filter using Ba(Co,Nb)O3 based ceramic and measured its filter properties. The center frequency of the dielectric filter was 9.953 GHz, the loaded Q factor (QL ) was 1000, the insertion loss was 4.3 dB, and the temperature coefficient of center frequency (τf) was -0.8 ppm/°C
Keywords :
Q-factor; barium compounds; ceramics; dielectric losses; dielectric resonators; microwave filters; resonator filters; 4.3 dB; 9.953 GHz; Ba(Co,Nb)O3 ceramic; BaCoO3NbO3-TiO2; Q factor; TiO2 addition; dielectric loss; insertion loss; resonant frequency; super high frequency dielectric filter; temperature coefficient; Barium; Ceramics; Dielectric losses; Dielectric measurements; Filters; Frequency measurement; Niobium; Q factor; Resonant frequency; Temperature control;
Conference_Titel :
Electronic Manufacturing Technology Symposium, 1995, Proceedings of 1995 Japan International, 18th IEEE/CPMT International
Conference_Location :
Omiya
Print_ISBN :
0-7803-3622-4
DOI :
10.1109/IEMT.1995.541080
