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Sol-Gel법으로 제작한 X/65/35 (X=6~11) PLZT 박막의 전기 및 광학 특성
강종윤,장낙원,백동수,최형욱,박창엽 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.3
In this study, PLZT stock solutions around x/65/35 (x=6~11) ferroelectric region were prepared by Sol-Gel method and deposited on ITO-glass by spin-coating method. The thin films were annealed by RTA(rapid thermal annealing). The variations of crystallographic structure of the thin films were observed using XRD and hysteresis curves, dielectric characteristics, and optical transmittances were measured in order to investigate the characteristics of the thin films. The thin films were crystallized at $750^{\circ}C$ for 5 min by RTA. Relative dielectric constant and optical transmittance increased with increasing La content, Ec and Pr were higher for thin films than for bulk materials.
강종윤,최지원,심성훈,박용욱,윤석진,김현재 한국전기전자재료학회 2002 전기전자재료학회논문지 Vol.15 No.1
A low-temperature cofired-ceramic (LTCC) multi-layer ceramic (MLC) band-pass filter (BPF) is presented, which has the benefits of low cost and small size. The BPF is designed for an IMT-2000 handset. The computer-aided design technology is also presented. The BPF with an attenuation pole at below the passband has been discussed and realized. The equivalent circuit of the BPF was established by transmission lines and lumped capacitors. The frequency characteristics of the LTCC-MLC BPF is well acceptable for IMT-2000 application.
마이크로파 가변 소자용 K-band Coplanar Stripline 공진기 설계
강종윤,윤석진,김현재,Kang, Chong-Yun,Yoon, Seok-Jin,Kim, Hyun-Jai 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.6
In order to develop a tunable resonator which can be easily operated by DC bias and applied for microwave tunable filters and devices using ferroelectric thin or thick films, the non conductor backed-and conductor backed- coplanar stripline resonators have been designed and analyzed. They have been designed to be operated at 25 GHz which involve coplanar stripline input and output ports. The resonators have been simulated and analyzed using Ansoft HFSS. The research has been focused on the Quality factor of the coplanar stripline resonator. The conductor Q, box Q, and radiation Q of the resonators have been analyzed and calculated according to the substrate thickness & conductor width of the resonators. From these parameters, the loss factors of the coplanar stripline resonator have been investigated. The conducting Q of the coplanar stripline resonator has no relation with the thickness of dielectric substrate and increases as the conductor width increases. The box Q has no much relation with the thickness of substrate and the conductor width, which is above 2000. The radiation loss increases as the thickness of substrate and the conductor width increase. To decrease the radiation loss of the coplanar stripline resonator, a conductor backed coplanar stripline resonator has been proposed which has the unloaded Q of 170.
강종윤,조광환,윤석진,이영백 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
ZrO2-doped (Ba0:6Sr0:4)TiO3 (BST) thin films with different ZrO2 contents were deposited on (100) LaAlO3 substrates by reactive magnetron co-sputtering. The dielectric properties of the ZrO2-doped BST thin films were measured using a symmetrical stripline resonator with shorted ends ranging from 1 to 3 GHz. We demonstrated that doping with ZrO2 significantly improved the dielectric properties of the BST thin lms. ZrO2 doping successfully reduced the dielectric loss tangent (tan δ) from 9.2 × 10-3 (pure BST) to 2.9 ×10-3 (ZrO2 doped BST). The results of this study showed that the BST films remained tunable in a range of 29 ∼ 42.7 %, which is sucient for tunable microwave device applications. Consequently, ZrO2 doping improved the figure of merit (K) for the films from K = 46.4 (pure BST) to K = 114.1 (ZrO2-doped BST). ZrO2-doped (Ba0:6Sr0:4)TiO3 (BST) thin films with different ZrO2 contents were deposited on (100) LaAlO3 substrates by reactive magnetron co-sputtering. The dielectric properties of the ZrO2-doped BST thin films were measured using a symmetrical stripline resonator with shorted ends ranging from 1 to 3 GHz. We demonstrated that doping with ZrO2 significantly improved the dielectric properties of the BST thin lms. ZrO2 doping successfully reduced the dielectric loss tangent (tan δ) from 9.2 × 10-3 (pure BST) to 2.9 ×10-3 (ZrO2 doped BST). The results of this study showed that the BST films remained tunable in a range of 29 ∼ 42.7 %, which is sucient for tunable microwave device applications. Consequently, ZrO2 doping improved the figure of merit (K) for the films from K = 46.4 (pure BST) to K = 114.1 (ZrO2-doped BST).
강종윤,심성훈,최지원,박용욱,이동윤,윤석진,김현재 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.8
A multi-layer ceramic (MLC) chip type band-pass filter (BPF) is presented. The MLC chip BPF has the benefits of low cost and small size. The BPF consists of coulped stripline resonators and coupling capacitors. The BPF is designed to have an attenuation pole at below the passband for a receiver band of IMT-2000 handset. The computer-aided design technology is applied for analysis of the BPF frequency characteristics. The passband and attenuation pole depend on the coupling between resonators and coupling capacitance. The frequency characterics of the passband and attenuation pole are analyzed with the variation of the coupling between resonators and coupling capacitance. An equivanlent circuit and structure of MLC chip BPF are proposed. The frequency characteristics of the BPF is well acceptable for IMT-2000 application.