• 한국초전도ㆍ저온공학회논문지
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• 제4권2호
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• pp.11-15
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• 2002

High speed probe for measurement of sin91e flux quantum circuits is comprised of coaxial cables and microstrip lines in order to carry high speed signals without loss. For the impedance matching between coaxial cable and microstrip line, we have determined the dimension of the microstrip line with 50${\Omega}$ impedance by simulation and then have investigated the effect of line width and cross-sectional shape of signal line, dielectric material, thickness of soldering lead at the coaxial-to-microstrip transition Point, and the an91c between dielectric material and end part of the signal line on the characteristics of signal transmission of the microstrip line. From the simulation, we have found that these all parameter's had influenced on the characteristic of signal transmission on the microstrip line and should be reflected in fabricating high speed probe, We have also determined the dimension of coplanar waveguide to fabricate testing sample for performance test of high speed probe.

• 전자공학회논문지 IE
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• 제45권2호
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• pp.13-19
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• 2008

TLM 수치 해석법의 주요한 장점은 가장 복잡한 전송선 구조에 있어서도 해석이 용이하다는 것이다. 본 논문에서는 대칭압축노드를 이용한 TLM법을 마이크로스트립 meander 라인에 성공적으로 적용하였다. 플라나 마이크로스트립 전송선을 모델화하기 위한 대칭압축노드에 대한 상세한 기술이 제시되었고 또한 2종류의 마이크로스트립 meander 라인의 산란 파라메터 $S_{11}$과 $S_{21}$을 계산하였다. 구해진 결과로부터 TLM 해석법이 복잡한 플라나 마이크로웨이브 전송선 구조를 모델링하는데 유용한 해석법임을 보였다. 제시된 TLM 해석 결과는 고주파 영역에서 마이크로웨이브 집적 회로를 설계하는데 유용하게 사용될 수 있다.

• 대한전자공학회논문지SD
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• 제41권8호
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• pp.37-44
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• 2004

본 논문에서는 RF 부품 수동소자 중 가장 기본적인 요소가 되는 전송선로를 DAML(Dtelectric-supported Airbridge Microstrip Line) 형태의 새로운 구조로 제안하였으며, DAMS(Micro Electro Mechanical System) 기술 중 표면 마이크로머싱닝(surface micromachining) 기법을 이용하여 구현하였다. 제안된 구조는 마이크로스트립 라인(microstrip line)의 응용 형태로서 기존의 신호선(signal line)과 ground 사이에 유전체 지지대(dielectric post)를 사용하였고, 신호선을 공중으로 띄우면서 넓은 범위의 임피던스에서 유전체 손실(dielectric loss)을 최소화하였다. 본 논문에서 제작된 전송선로는 10 ㎛의 신호선의 높이와 10 ㎛ × 10 ㎛의 지지대(Post) 면적과 9 ㎛의 지지대(post)의 높이와 5 mm의 길이로 제작되었다. 50 GHz에서 일반적인 마이크로스티립(microstrip) 전송선의 손실이 약 7.5 dB/cm 이상 되는 것과 비교하여 본 논문에서 제안한 구조에서는 50 GHz에서 전송선의 손실이 약 1.1 dB/cm가 되는 것을 얻었다.

• 전자공학회논문지D
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• 제34D권5호
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• pp.14-21
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• 1997

The crosstalk among three identical uniform coupled microstrip transmissiom lines is examined. To analyze the crosstalk, the simultaneous equations for the voltage and current waves on each transmission line are induced from the transmission line equation. The capacitance and the inductance of the line to solve the transmission line equation are calculated by the spectral domain analysis and the space domian analysis. There are three quasi-TEM modes is three microstrip transmission lines and the characteristics mode impedences in each mode are almost equal at a weak coupling state. The crosstalk among three identical microstrip transmission lines is calculated varying the frequency from 50MHz to 3GHz.

• ETRI Journal
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• 제33권6호
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• pp.985-988
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• 2011

A novel application of a dual-transmission line is proposed to design a lowpass filter (LPF). The proposed structure uses only transmission line elements to produce an equiripple LPF response with sharp roll-off. Design equations are derived using a lossless transmission line model. Controlling the electrical lengths, three transmission-zeros are realized in the stopband to obtain a sharp roll-off rate and wide stopband bandwidth. A single unit microstrip LPF with a 3-dB cut-off frequency at 1.0 GHz having a roll-off of 135 dB/GHz along with a stopband bandwidth of 69.5% is designed for validation.

• Journal of Advanced Marine Engineering and Technology
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• 제34권6호
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• pp.840-845
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• 2010

본 논문에서는 MMIC상에서 온칩용 수동소자 제작을 위해서, 주기적으로 배치된 용량성 소자를 이용한 단파장 전송선로를 제안하였다. 제안된 PACD(periodically arrayed capacitive devices) 선로 구조는 기존의 마이크로스트립 선로에 비해 매우 짧은 선로파장 특성을 보였다. PACD 선로 구조는 주파수 5GHz에서 기존의 마이크로스트립 선로 파장의 8%의 파장단축 효과를 보였고, PPGM구조의 선로 파장의 38%의 파장단축 효과를 나타내었다. 이러한 PACD선로 구조는 MMIC상에서 온칩용 수동소자 제작에 유용한 특성으로 판단된다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1201-1202
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• 2008

In this paper, using symmetrical condensed node(SCN), the TLM numerical technique has been successfully applied to microstrip meander line. A detailed technique of the symmetrical condensed node(SCN) may be used to model planar microstrip transmission line is presented. Also, the S-parameters $S_{11}$ and $S_{21}$ of microstrip meander line have been computed. From obtained results, TLM analysis is shown to be an efficient method for modeling complicated structure of planar microstrip transmission line.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제55권1호
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• pp.40-44
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• 2006

In this paper, the distortion characteristics of an electrical pulse which has a rise/fall time due to the dispersion and the reflection, on nonuniform tapered microstrip lines has investigated in time domain. The transmission characteristics on uniform microstrip lines in time domain had represented already, but the results for the nonuniform tapered microstrip lines not represented yet. We investigated the transmission characteristics for pulse signal on the nonuniform tapered microstrip lines, and the result applied to design of wide band impedance matching circuit in design of MMIC. The voltage and current transfer functions are shown for the tapered line. The dispersion and distortion obtained by using these transfer functions are represented for the nonideal square pulse.

• 산업기술연구
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• 제28권B호
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• pp.251-255
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• 2008

Metamaterial are artificial structures that can be designed to exhibit specific electromagnetic properties not commonly found in nature. Metamaterial transmission lines are usually fabricated with a microstrip structure and it's equivalent circuit is composed of two series capacitances and a shunt inductance. However microstrip structure need a via hall for realizing a shunt inductance. To eliminate via hall, we proposed a CRLH transmission line using a CPW structure, and obtained equivalent circuit values, line parameters.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2006년도 하계학술대회
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• pp.158-161
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• 2006

In this paper, we deal with EMI Analysis on Microstrip with Defected Ground plane. Specially, we investigate reflection, transmission, crosstalk, radiated emission on Microstrip with Defected Ground plane structure. And investigates undesired effects on various defected ground plane such as ground with split, slot, short end and open end gap. To analyze reflection, transmission and crosstalk of microstrip with defected ground plane, we used concept of the microstrip to slot line transition model. Besides, investigate radiated emission using FDTD Commercial tools such as CST MW