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LTCC적층형 대역통과필터의 공정 및 특성 최적화 연구
강동헌,차훈주 수원대학교 산업기술연구소 2003 산업기술연구소논문집 Vol.18 No.-
Multi-layered ceramic chip bandpass filter for 2.4 GHz ISM band was fabricated by using LTCC (Low Temperature Co-fired Ceramics) technology, and related processing parameters such as lamination condition, sintering temperature, time and electrode condition were investigated in terms of filters characteristics. The BPF consists of coupled stripline resonators and coupling capacitors. The sintering shrinkages was affected substantially by lamination pressure and sintering temperature. And insertion loss with inner conductor thickness has been discussed and realized. Insertion losses in the passband were less than 2 dB and the attenuation more than 25 dB at 2.1 GHz. The frequency response characteristics of the chip BPF is well acceptable for bluetooth application.
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PCFN-PZW계의 마이크로파 유전 특성에 미치는 Pb계 Flux의 영향
강동헌,설충의,차훈주,김영호,길상근,조봉희 한국전기전자재료학회 2002 전기전자재료학회논문지 Vol.15 No.12
(Pb$\_$0.4/Ca$\_$0.6/)(Fe$\_$1/2/Nb$\_$1/2/)O$_3$ system was modified by 10 mol% Pb(Zn$\_$1/2/W$\_$1/2/)O$_3$ addition and their sinterability and microwave properties were investigated as a function of the amount of flux (0.975PbO-0.025SnO$_2$). With increasing flux content, single perovskite phase was maintained up to 3 wt% flux addition and further addition led to the presence of Pb-rich second phase which was confirmed by EDS analysis. The apparent densities of PCFN-PZW specimen increased and showed maximum values at 2.5 wt% flux addition for the Ts=1000$^{\circ}C$ and 2.0wt% flux addition for the Ts=1050$^{\circ}C$, respectively. The dielectric constant and Q$.$f values strongly depended on the variation of density and microstructure, where the optimum values of $\varepsilon$$\_$r/ = 91.95, Q$.$f = 5938GHz, TCF = +8.15ppm/$^{\circ}C$ were obtained for the 2.5wt% flux added PCFN-PZW specimen sintered at 1000$^{\circ}C$ for 4h.
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