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유상길(Sang-Gil Yu),최순우(Swoon-Woo Choi),김동현(Dong-Hyun Kim),김대오(Dae-Oh, Kim),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.5
This paper presents precise measurement techniques for waveguide components at microwave band. The error parameters are presented in the network analyzer and the calibrated results are shown by using the SOLT(Short-Offset short-Load-Thru) kit when measuring waveguide components. A method is proposed to obtain the performances of the circular-rectangular waveguide transition by in order connecting 3 offset shorts. The scattering parameters of the transition are calculated from the measured reflection coefficients with 3 offset shorts. The waveguide transition has a reflection coefficient of less than -18dB and a transmission coefficient of more than –0.16dB. Next, a method utilizing a low-reflection horn at the common port of an OMT is introduced. The electric performances between the straight and side ports are measured by employing connecting a low-reflection horn at the common port of the OMT. The measurements agree well with the designed results.
유상길(Sang-Gil Yu),박철수(Cheol-Su Park),최순우(Swoon-Woo Choi),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.10
This paper proposes a Ka-band monopulse feed horn having four input rectangular waveguides. The proposed feed consists of four input waveguides, two H-moders, a E-moder and a flared horn. Two H-moders and the E-mode having waveguide discontinuous structures are designed by using the DFT function in the commercial software. The lengths of each moder and the flared horn are determined to satisfy in-phase conditions of the multi modes at the feeds aperture. Five-step waveguide transformers are designed and employed to connect the input waveguide of the feed to the WR-28 rectangular waveguide. The optimally designed monopulse feed is fabricated with 3 split blocks. The fabricated horn has a reflection coefficient of less then -10dB over 34.55-36.56GHz and a -15dB beamwidth of 100°. In the difference patterns over the azimuth and elevation planes, the null is less than -22dB at the center of the feed.
연속 공정 PVD 방법에 의한 Coated Conductor 제조
고락길,정준기,김호섭,하홍수,송규정,박찬,유상임,문승현,김영철,Ko, Rock-Kil,Chung, Jun-Ki,Kim, Ho-Sup,Ha, Hong-Soo,Shi, Dongqi,Song, Kyu-Jeong,Park, Chan,Yoo, Sang-Im,Moon, Seung-Hyun,Kim, Young-Cheol 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.11
Continuous physical vapor deposition (PVD) method is one of many processes to fabricate long length coated conductor which is required for successful large-scale application of superconducting power devices. Three film deposition systems (pulsed laser deposition, sputtering, and evaporation) equipped with reel-to-reel(R2R) metal tape moving apparatus were installed and used to deposit multi-layer oxide thin films. Both RABiTS and IBAD texture templates are used. IBAD template consists of CeO$_2$(PLD)/YSZ(IBAD) on stainless steel(SS) metal tape, and RABiTS template has the structure of CeO$_2$/YSZ/Y$_2$O$_3$ which was continuously deposited on Ni-alloy tape using R$_2$R evaporation and DC reactive sputtering in a deposition system designed to do both processes. 0.4 m-long coated conductor with Ic(77 K) of 34 A/cm was fabricated using RABiTS template. 0.5 m and 1.1 m-long coated conductor with Ic(77 K) of 41 A/cm and 26 A/cm were fabricated using IBAD template.
RABiTS 위에 PLD 방법으로 증착된 YBCO 초전도 박막 선재의 제조
고락길,정준기,하홍수,김호섭,송규정,박찬,문승현,유상임,김영철,Ko Rock-Kil,Shi Dongqi,Chung Jun-Ki,Ha Hong-Soo,Kim Ho-Soup,Song Kyu-Jeong,Park Chan,Moon Seung-Hyun,Yoo Sang Im,Kim Young-Cheol 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
YBCO coated conductor is one of the most promising materials as a new generations wire especially for practical power applications. In this work, $YBa_2$$Cu_3$$O_{7}$ -$\delta$/(YBCO) coated conductors (CC) were deposited by pulsed laser deposition (PLD) from buffer layers to superconducting layer on hi-axially textured metal tape. The oxide multilayer buffered substrate of architectures of $CeO_2$/$YSZ/Y_2$$O_3$ was fabricated by PLD at steady status. Then YBCO layer was deposited on RABiTS substrate by stationary and reel-to-reel (R2R) continuous process and we compared with deposition conditions of both processes. The degree of texture of each layer was investigated using X-ray diffraction including $\theta$-2$\theta$ scans, $\omega$-scans and $\Phi$-scans analysis. Their surface morphology was observed by scanning electron microscopy (SEM). The FWHM of the X-ray $\Phi$-scans and $\Phi$-scans indicated that YBCO and buffer layers closely replicate the in-plane and out-of-plane texture of metal tape. Critical current (Ic) at 77 K, self-field of 75.8 A/cm-width, critical temperature (Tc) of 85 K, and critical current density (Ic) of 3.7 MA/$\textrm{cm}^2$ were measured from coated conductor deposited by stationary process. And coated conductor deposited by R2R continuous process had Ic of 57.5 A/cm-width, Tc of 86.5 K and Jc of 2.0 MA/$\textrm{cm}^2$. The film also exhibits a homogeneous and dense surface morphology.