• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.176-177
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• 2008

이 논문에서는 $0.35{\mu}m$ 공정으로 제작된 MOSFET의 고주파 동작 특성을 분석하였다. Multi-finger 형태인 게이트 폭의 길이 변화에 따른 특성 변화를 BSIM3v3 모델과 외부 기생 파라미터를 포함한 lumped element를 이용해 모델링을 하였다. 또한 Multi-finger 게이트 구조에서 게이트 finger 수의 증가에 따라 생기는 특성 변화를 각각의 구조에 따라 추출된 주요 기생 파라미터의 변화를 통해 분석하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.2
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• pp.164-169
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• 2002

This paper reports on design and fabrication of near field probe operating at 300~3000 MHz. Design parameters are extracted by equivalent circuit of E-field probe and simulation using S parameter is performed to predict probes performance. The probe consists of a dipole antenna with 3.25 mm length, a zero bias Schottky diode and a highly resistive transmission line. A TEM cell was used for performance evaluation.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.46 no.4
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• pp.64-69
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• 2009

This paper addresses the simulation methodology of signal integrity and power integrity for mobile display modules. The proposed technique can be applied to analyse a circuit module which consist of connector, FPCB and driver ICs. The recent demand of serial interconnection technology in the mobile display industry needs delicate impedance control of signal and power traces to prohibit system malfunctioning and to reduce electromagnetic field radiation. Based on the S-parameter and Z-parameter analysis, we analyse the correlation between frequency-domain and time-domain measurements. With multi-port macros, signal integrity can be included in power integrity analysis in time domain.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1654-1655
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• 2011

This paper presents an algorithm applied to measure scattering parameters of a Multiport device with a 2-port Vector Network Analyzer (VNA). By employing the conversion of Scattering matrix with different reference impedances at ports, data obtained from 2-port configuration measurements can be synthesized to build the full scattering matrix of this device. A good agreement of estimated and measured parameters verified the performance of the algorithm.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.11 no.4
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• pp.259-267
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• 1986

The small-signal S-parameters of GaAs MESFET are measured in terms of frequencies and bias conditions. The resonating network and the load matching network of the fixed-frequency microwave oscillator analyzed by two-port network analysis are designed by the optimum method of CAD. The 6GHz oscillator circuit is built and tested on the microstrip substrates. Finally, it is verified that the experimenta results conformed to the optimum data by CAD.

• Proceedings of the KAIS Fall Conference
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• 2004.06a
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• pp.206-208
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• 2004

본 논문에서는 LabIEW를 이용하여 필터(RF 수동회로)의 주파수 특성을 테스트하고 테스트한 필터의 특성정보를 관리하는 필터 품질 자동화 시스템을 개발하였다. 개발된 시스템은 LabVIEW에 의해 GPIB 통신으로 계측장비 네트워크 어날라이저를 제어하며 제작된 필터의 S파라미터를 측정하여 명세 기준에 적합하게 제작되었는지를 판별하며 그 결과를 Mysq데이터베이스에 저장하고 관리하게 된다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.6
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• pp.57-63
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• 2019

S-parameters were used to analyze the effect of the circuit according to the height of the EMI shield layers. Among the S-parameters, S11, S21, S22, and S31 were used as factors for determining the effect on the circuit function. Simulations were performed using shields made of Graphite and Ferrite, and the frequencies were run from 100 MHz to 1 GHz. As the height of the shield was increased, the value of S21 was getting closer to 0 dB. In addition, the SE value was confirmed to improve the shielding performance according to the thickness of the insulating layer only in a specific frequency band. Based on 800um with thickest silicon dioxide thickness, the FG structure averaged -1 dB in narrow frequency bands between 100 MHz and 300 MHz, showing better efficiency than GF with an average of -2 dB. Although GF structures do not show high efficiency, they exhibit average performance of -3 dB in frequency bands between 100 MHz and 1 GHz rather than FG structures that sway over a wide range. In other words, FG and GF structures have trade-off structures. Therefore, it should be noted that the appropriate structure is selected for use.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.10
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• pp.1344-1352
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• 2018

In this paper, we propose a two-port S-parameter data to diagnose the fault conditions of a single-phase transformer. Using the S-parameters we can measure the reflection and transmission characteristics of signal power at the port of a transformer, which can also be converted into ABCD parameters and Z parameters through a well-known conversion formulas. Transformer fault diagnoses can be performed based on the intuitive and qualitative/quantitative characteristics of the these parameters. In addition, we can obtain wide frequency characteristics at the primary and secondary sides of the transformer, which can be used to get time domain responses using the inverse Fourier transformation with some specific input waveform. In order to verify the effectiveness of the proposed method, the fault conditions were analyzed in simulation and experiment for 3 kVA single phase transformer with 15: 5 turns ratio, and the validity of the proposed method was verified.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.6
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• pp.888-894
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• 2018

In this paper, we proposed a mixed-mode s-parameter measurement system for measuring the performance of twisted pairs. A twisted pair is a balanced type component, its characteristics can not be directly measured using network analyzer, which is generally implemented as a unbalanced type. It is possible to convert between balanced signal and unbalanced signal by using a balun but it restricts the frequency range of the measurement system. The proposed system measures the performance of twisted pairs by measuring mixed-mode s-parameters using a 4-port vector network analyzer and a designed fixture, without using a balun. We measured the performance of a commercial Ethernet cable and compared with the results which measured by using baluns. The results showed that the proposed system is capable of measuring the performance of twisted pairs.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.7
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• pp.26-36
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• 2002

Mach-Zehnder type traveling-wave optical modulators with 3-section and 5-section phase reversal were designed and fabricated on z-cut $LiNbO_3$ substrates. Optical waveguides were designed by means of the FDM(Finite Difference Method). Design of CPW traveling-wave electrodes were performed by the SOR(Successive Over Relaxation) in the active region and by the CMM(Conformal Mapping) in the input/output section. The optical response R(${\omega}$ calculated based on the measured S-parameters showed the bandwidth of 15GHz centered at 25GHz for the 3-section, and the bandwidth of 22GHz at 45GHz for the 5-section.