• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.5
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• pp.69-74
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• 2010

In this paper, we proposed a compact arbitrary dual-band band-stop filter using CRLH transmission line. The proposed filter used CRLH transmission line as stub and it developed dual-band band-stop characteristics using non-linear phase response of CRLH transmission line. The size of proposed filter is compact. And it can control arbitrary dual stop band. In this paper, designed band-stop filter at GPS band and ISM band As result, the S(2,1) is about -30dB at GPS band and about -29dB at ISM band. The fabricated filter is very compact. Its dimension is 10mm*15mm.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.4
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• pp.73-80
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• 2013

In this paper, an experimental circuit model for an accurate high-frequency characterization of transmission line is proposed. Inherent resonance effects during measurements make it difficult to determine characteristic impedance and propagation constant at the resonance frequencies corresponding to the line length. Thus, resonance-effect-free transmission line parameter determination technique based on the physical insight and theory is proposed. Then, by using the parameters high-frequency circuit model is proposed for high-speed signal propagation characterization. The proposed frequency-variant transmission line model is verified with measurement and it can be usefully exploited in high-speed signal propagation characterization.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.2
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• pp.147-152
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• 2014

A longitudinal modal transmission-line theory(L-MTLT) to analyze the static and dynamic behavior of two-section distributed feedback (DFB) lasers is used. The characteristic impedance and equivalent propagation constant of DFB structure with active layer are derived from L-MTLT. A two-section DFB laser is analogous to a transmission-line network, in which each section is described by transmission-line block corresponding to the equivalent factors. The longitudinal resonant condition of DFB laser based on equivalent transmission-line network is used to reformulate the rate equations so that static and dynamic behavior of two-section DFB lasers with active layer is demonstrated and analyzed accurately.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.10 s.101
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• pp.1036-1042
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• 2005

The crosstalk between bent transmission lines and the effects of additional trace with the metal filled via holes on alleviating the crosstalk are investigated using the circuit concept approach for transmission line sections and impedance modeling for via hole sections. All sections are represented by ABCD matrices and then cascaded. Finally the calculated results by proposed method are confirmed that they agree with the measured results in less than 3 dB except a band of low frequency.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.4 s.95
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• pp.402-409
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• 2005

In analog and digital electronic systems, crosstalk between transmission lines on the printed circuit board can degrade the performance of equipment operations. This paper presents a technique to analyze the effects of via fence, which is based on additional transmission lines grounded by vias. The technique is composed of a circuit concept approach for transmission line sections md an impedance modeling of via hole sections. All sections are represented by ABCD parameters and they are cascaded. Finally, this technique was verified by comparing the measurement results with the simulation ones.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.2017-2018
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• 2006

전력선 통신기술은 추가 배선이 필요 없는 유용성에도 불구하고 전력선 채널에 대한 정확한 채널 모델링과 전력선 모뎀의 전송 신뢰성에 대하여 많은 문제점을 나타내고 있다. 본 논문에서는 전송선로의 주파수에 대한 잡음과 임피던스 특성을 분석하고, 이의 해결을 위하여 전력선 채널에 Spread Spectrum 기법을 적용한 신호를 전송하였을 때의 시뮬레이션 결과와 구현된 FPGA 보드를 비교분석 하였다. 채널 모델링은 잡음과 감쇄 특성을 고려하였으며, Spread Spectrum 변조 방식을 적용한 전력선 모뎀의 FPGA를 구현하여 성능을 분석하였다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.2 no.3
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• pp.3-9
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• 1991

Validity and limitation of conventional methods for analyzing the characteristics of nonuniform transmission lines are discussed here. It is found that uniqueness of cal- culated input impedance of an exponential transmission line by employing conventional methods is not assured in general but only under secific conditions. And the calculated input impedance of an angled two-plane transmission line based on the conventional planar TEM mode devices from its rigorous solution.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.8B
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• pp.1035-1040
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• 2001

SNU-ISRC 0.25$\mu\textrm{m}$ pHEMT 표준 공정을 사용하여 Ka-band에서 동작하는 0.2W급 MMIC CPW 전력증폭기를 설계, 제작하였다. 기존의 MMIC 공정에서 사용되는 마이크로스트립 전송선 대신 CPW 전송선을 사용함으로써 보다 간단하고 저가의 공정이 가능하였다. 전력증폭기의 설계에서는 보다 넓은 주파수 대역에서 원하는 출력전력을 얻기 위해서 출력단을 Wilkinson coupler를 사용하였는데, 일반적으로 Wilkinson coupler에 사용되는 50Ω 특성임피던스 전송선 대신에 25Ω 특성임피던스 전송선을 사용하여 좋은 출력단 전력 정합과 출력 반사손실을 동시에 얻을 수 있었다. 제작된 전력증폭기의 측정결과, 주파수 27GHz에서 출력전력 23.4dBm과 Power-added Efficiency 21.7%의 결과를 보였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.2
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• pp.170-175
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• 2002

The cut-off frequencies of higher order modes in a symmetrical stripline are calculated using the variational finite element method combined with the conformal mapping. The conformal mapping is used to Improve the modeling of the infinite transverse extents of a stripline. And then the finite element method is employed to solve the variational equation in the transformed finite region. Comparisons with numerical results found in the literature validate the presented method.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.36C no.3
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• pp.26-34
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• 1999

A new silicon-based IC interconnect transmission line parameter extraction methodology is presented and experimentally examined. Unlike the PCB or MCM interconnects, a dominant energy propagation mode in the silicon-based IC interconnects is not quasi-TEM but slow wave mode(SWM). The transmission line parameters are extracted taking the silicon substrate effect (i.e., slow wave mode) into account. The capacitances are calculated considering silicon substrate surface as a ground. Whereas the inductances are calculated by using an effective dielectric constant. In order to verify the proposed method, test patterns were designed. Experimental data have agreement within 10%. Further, crosstalk noise simulation shows excellent agreements with the measurements which are performed with high-speed time domain measurement ( i.e., TDR/TDT measurements) for test pattern, while RC model or RLC model without silicon substrate effect show about 20~25% underestimation error.