• Title/Summary/Keyword: Micro-strip lines

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Study of transient response in dielectric microstrip line with opto-microwave pulses

  • Wang, Xue;Kim, Ji-Hyoung;Yun, Ji-Hun
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.2 no.2
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    • pp.63-68
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    • 2009
  • We study on the transient response in non-uniform microstrip lines with optically controlled microwave pulses. The transient response of the microwave pulses in plasma layer has been evaluated by reflection function of dielectric microstrip lines. The variation of characteristic response in plasma layer with localized pulses has been evaluated analytically. Reflection the change of the reflection amplitude has been observed.

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Stepped Impedance LPF Using MCS Line with Ground (접지가 있는 MCS 선로를 이용한 스텝 임피던스 저역 필터)

  • Rhee, Seung-Yeop;Lee, Yong-Kook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.11
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    • pp.1248-1253
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    • 2008
  • The MCS(Micro-Coplanar Strip) line with ground has been analyzed. The conformal mapping method is used to calculate the quasi-static effective dielectric constant and characteristic impedance of this MCS line. The computed results of the present work are found to be in good agreement when compared with the results obtained using commercial S/W, IE3D. And in this paper, the stepped-impedance low pass filter is designed and fabricated with MCS lines for improving the frequency responses. The LPF proposed structure has been also designed and implemented to have the sharp attenuation characteristics in stop band. The agreement between simulation and measurement results verify the implemented LPF.

Design of X band Microstrip Directional Couplers (X-대역 마이크로 스트? 방향성 결합기의 설계)

  • 양인응;홍완희
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.12 no.4
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    • pp.7-14
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    • 1975
  • A significant new technique in the dsvelopment of micro-wave circuits is the process of untilization of coupled lines in the transverse electro-magnetic field. The bases for this technique are the application of even-and odd-mode characteristic impedances of the transmission line. This article describes the properties of directional couplers and explains a prccfdure usrd to design micro-strip directional couplers with the aid of the computer. The article also describes the experimental results obtained from seven microstrip couplers, which were built to verify the computer program and the approximate solutions. It can be seen that in cases at X-band where couplings of 10 to 20dB are required, the computer program and approximate solutions will produce good results.

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Study of Transient Response in Non-uniform Plasma Layer with Optically-Controlled Microwave Pulses (광-마이크로파 기반 유도플라즈마의 과도응답 특성에 관한 연구)

  • Wang, Xue;Choi, Yue-Soon;Park, Jong-Goo;Kim, Yong-K.
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.6
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    • pp.1174-1179
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    • 2009
  • In this paper we develop the characteristic of density on non-uniform plasma in different layer of the semiconductor with optically controlled microwave pulses. The transient response of the microwave pulses in different plasma layer has been evaluated by calculating the variation of the reflection function of dielectric microstrip lines. The lines has used under open-ended termination containing optically induced plasma region, which has illuminated a laser source. The characteristics impedances resulting from the presence of plasma are evaluated by the transmission line model. The analyzes the variation of transient response in a 0.01cm layer near the surface for frequency range from 1GHz to 128GHz. The diffusion length LD is larger than compared to the absorption depth $l/_{\alpha}l$. The variation of characteristic response in plasma layer with microwave pulses which has in deferentially localized has been evaluated analytically.

Stepped Impedance LPF using MCSl (MCS선로를 이용한 스텝 임피던스 저역필터)

  • Rhee, Seungyeop;Lee, Seongjae;Kim, On
    • The Journal of the Korea institute of electronic communication sciences
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    • v.3 no.3
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    • pp.153-157
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    • 2008
  • The MCS(Micro-coplanar strip) line has been analyzed. The conformal mapping method is used to calculate the quasi-static effective permittivity and characteristic impedance of this MCS line. The computed results of the present work are found to be in good agreement when compared with the results obtained using commercial S/W, IE3D. And in this paper, the stepped-impedance low pass microstrip filter is designed and fabricated with MCS lines for improving the frequency responses. The LPF proposed structure has been also designed and implemented to have the sharp attenuation characteristics in stop band. The agreement between simulation and measurement results verify the implemented LPF.

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Study of Non-uniform Plasma Layer Variation with Optically-Controlled Microwave Pulses

  • Wang, Xue;Yun, Ji-Hun;Kim, Yong-K.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.90-91
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    • 2009
  • We study of the variation on non-uniform plasma in different layer of the semiconductor. The transient response in different plasma layer has been evaluated theoretically. The reflection function of dielectric microstrip lines resulting from the presence of plasma are evaluated by the transmission line model. The diffusion length is small compared to the absorption depth. The variation of characteristic response in plasma layer with microwave pulses which has in localized has been evaluated.

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A Study of the Properties of Optically Induced Layers in Semiconductors Aided by the Reflection of Optically Controlled Microwave Pulses

  • Wang, Xue;Choi, Yue-Soon;Park, Jong-Goo;Kim, Yong-K.
    • Transactions on Electrical and Electronic Materials
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    • v.10 no.4
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    • pp.111-115
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    • 2009
  • We present a study on the reflection of optically controlled microwave pulses from non uniform plasma layers in semiconductors. The transient response of the microwave pulses in different plasma layers has been evaluated by means of the reflection function of dielectric microstrip lines. The lines were used with an open-ended termination containing an optically induced plasma region, which was illuminated by a light source. The reflection characteristics impedance resulting from the presence of plasma is evaluated by means of the equivalent transmission line model. We have analyzed the variation of the transient response in a 0.01 cm layer with a surface frequency in the region of 128 GHz. In the reflection the variation of the diffusion length $L_D$ is large compared with the absorption depth $1/{\alpha}_l$. The variation of the characteristic response of the plasma layer with differentially localized pulses has been evaluated analytically. The change of the reflection amplitude has been observed at depths of 0.1 cm, 0.01 cm and $0.1{\times}10^{-5}$ cm respectively.

Measurement of Multi-Port S-Parameters using Four-Port Network Analyzer

  • Kim, Jongmin;Luong, Duc Long;Nah, Wansoo;Kim, SoYoung
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.13 no.6
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    • pp.589-593
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    • 2013
  • An efficient measurement methodology is proposed to construct the scattering parameters of a multi-port device using a four-port vector network analyzer (VNA) without the external un-terminated ports. By using the four-port VNA, the reflected waves from the un-terminated ports could be minimized. The proposed method significantly enhances the accuracy of the S-parameters with less number of measurements compared to the results of classical renormalization technique which uses two-port VNA. The proposed method is validated from the measured data with the coupled 8-port micro-strip lines.

Simultaneous Quantitative Determination of Multiple Analytes with Fluorescence- Tagged Probes by Immunochromatogratphy

  • Jeong, Dong-Seok;Choi, Eui-Yul
    • Animal cells and systems
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    • v.7 no.1
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    • pp.89-92
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    • 2003
  • Immunoassays have become indispensable tools and achieved great importance in scientific and medical research. However, typical immunoassays are time-consuming and use complex, multi-step procedures. In this study, we introduce a new immunoassay system for the quantification of several analytes at a time without any washing steps. It is comprised of a detector solution with fluorescence-labeled antibodies and a test strip with immobilized capture antibodies. Using a micro-array scanner, the antigen-antibody complex was quantitatively determined by measuring the intensities of fluorescence on the capture lines or dots of nitrocellulose membrane. This method demonstrated its rapid quantitative determination of analytes without many processing steps as well as specific identification of multiple analytes in biological specimens.

An optical true time delay for 10 GHz linear phased array antennas composed of optical 2×2 MEMS switches and fiber delay lines (광 2×2 MEMS 스위치와 광섬유 지연선로를 이용한 10 GHz 선형 위상배열 안테나용 광 실시간 지연선로)

  • 이백송;신종덕;김부균
    • Korean Journal of Optics and Photonics
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    • v.14 no.4
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    • pp.466-472
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    • 2003
  • In this paper, we proposed an optical true time-delay (TTD) feeder system for phased array antennas (PAAs). The system possesses high-speed beam scan capability since, in this scheme, different lengths of fiber delay-lines are selected by optical 2${\times}$2 MEMS switches at high speed. An optical TTD capable of beam scanning in one of eight different directions has been built for 10 GHz linear PAA systems. Experimental results on time delay measurements show that the maximum time delay error is less than 0.2 ps corresponding to a scan angle error of less than 0.84o. We have also designed a 10 GHz linear PAA composed of eight micro-strip patch antenna elements driven by the proposed TTD, and the radiation patterns of this PAA have been analyzed by simulation.