• Title/Summary/Keyword: YBCO.

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Design of the High-Temperature Superconducting Patch Array Antenna with Circular Polarization for DBS Receiver (위성방송 수신용 원형 편파 고온초전도 평판 배열 안테나)

  • 하재권;강광용;곽민환
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2001.02a
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    • pp.142-144
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    • 2001

  • We designed superconducting four-element patch array antenna which has single-feed circularly polarization and a resonance frequency of 11.85 GHz for DBS receiving system. Antennas have been fabricated from both gold conductor and $YBa_{2}$$Cu_{3}$$O_{7-x}$(YBCO) superconductor (thin films) for comparison. Simulated and measured results, and analysis on resonant frequency(fr), return loss, and bandwidth are presented.

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Crystal Growth of Superconducting $YBa_2Cu_3O_{7-x}$ Single Crystals ($YBa_2Cu_3O_{7-x}$초전도 단결정 성장)

  • 정광철;오근호;최종건
    • Journal of the Korean Ceramic Society
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    • v.27 no.4
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    • pp.536-542
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    • 1990

  • Single crystals of YBa2Cu3O7-x have been grown in BaCuO2 flux at temperature of 125$0^{\circ}C$ and examined using XRD, EDAX and light microscopy. The YBCO crystals were grown in a cavity which was formed by the reduction of CuO and became large by the directional solidification in the crucible. The observed crystal growth habit is square planar with the c-axis normal to the plane. The surface morphology of grown crystals were growth ledges and growth sprial paterns on a (001) face.

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Junction, Circuit and System Developments for a High-$T_c$ Superconductor Sampler

  • Hidaka, M.;Satoh, T.;Tahara, S.
    • Progress in Superconductivity
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    • v.1 no.2
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    • pp.81-84
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    • 2000

  • A Josephson sampler circuit using high-Tc superconductor (HTS) ramp-edge junctions has been designed, fabricated, and experimentally tested. It consists of five ramp-edge junctions with a stacked groundplane and is based on single-flux-quantum (SFQ) operations. The sampler was used to measure current waveforms at picosecond and microampere resolutions. We are developing a system based on the sampler for measuring the current waveform in a room-temperature sample. And measuring current flowing through wiring in a semiconductor large-scale integrated circuit is a promising application for the HTS sampler system.

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