• 한국세라믹학회지
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• 제43권2호
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• pp.74-78
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• 2006

A non-integrated type noise filter on a Coplanar Waveguide (CPW) transmission line is demonstrated by using a highly resistive $Co_{41}Fe_{38}Al_{13}O_8$ nanogranular thin film with the dimensions of $4\;mm (\iota)\times4\;mm(\omega)\times0.1\;{\mu}m(t)$. The noise suppression characteristics are evaluated without placing an insulating layer between the CPW line and the magnetic thin film. The insertion loss is very low being less than 0.3 dB and this low value is maintained up to 2 GHz. At a ferromagnetic resonance frequency of 3.3 GHz, the power loss is very large and the degree of noise attenuation is measured to be 3 dB. This level of noise attenuation is still small for real applications; however, considering the small magnetic volume used in this work, further improvement is expected by simply increasing the magnetic volume and by integrating the magnetic thin film into the CPW transmission line.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.401-404
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• 2002

This paper proposes a new symmetrical bandpass filter based on capacitive loading with a coplanar waveguide (CPW) structure. The filter was numerically designed at the operating frequency around 2 ㎓ by using IE3D software package. The characteristics of the proposed filter were then measured which the results were in good agreement with simulation. The passband insertion loss was considerably low (~3 ㏈) and the return loss was high (greater than 10 ㏈). The size of the proposed filter was also decreased approximately 50% when comparing with the fitters using conventional transmission lines.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2005년도 종합학술발표회 논문집 Vol.15 No.1
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• pp.111-114
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• 2005

The isolation performance of the S-band single-pole single-throw (SPST) monolithic microwave integrated circuit (MMIC) switch with two different RF-interconnection approaches, microstrip and grounded coplanar waveguide (GCPW) lines, are investigated. On-to-off isolation is improved by 5.8 dB with the GCPW design compared with the microstrip design and additional improvement of 6.9dB is obtained with the coplanar wire-bond interconnection (CWBI) at 3.4 GHz. The measured insertion loss and third-order inter-modulation distortion (IMD3) are less than 2.43 dB over 2.5 CHz $\sim$ 4 GHz and greater than 64 dBc.

• 전기학회논문지P
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• 제64권3호
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• pp.116-120
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• 2015

In this paper, a step type driver dipole antenna with a tapered balance and unbalance (balun) by a coplanar waveguide (CPW) to coplanar strip (CPS) transition is proposed. The proposed antenna consisted of step type driver, a CPW to CPS transition and tapered balun. The proposed antenna is realized the multi and wide resonate frequency band to introduce the step type driver and tapered balun. The step type driver is acted as a director too. This antenna could be more easily designed than the conventional printed quasi-Yagi dipole antenna. The operating frequency bandwidth was 650 [MHz] (2.65~3.3 GHz), 900 [MHz] (4.7~5.6 GHz) under a return-loss criterion of less than 10 dB. The measurements of the proposed antenna exhibited good results in the wideband operating frequency and radiation pattern. The proposed antenna can support wireless communications applications.

• 전기학회논문지P
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• 제60권2호
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• pp.53-55
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• 2011

The printed wide band monopole antenna having characteristics of dipole by modified coplanar wave guide(CPW) ground plane is presented. We are called a slot-arm printed monopole antenna and investigated the effect of the surface currents of the radiator on ground plane. The proposed antenna is treated as two asymmetric dipoles with the included angle of $90^{\circ}$ degrees which lie along Z-direction symmetrically. It is observed that the effect of the surface currents on the radiation patterns is similar to that of the corresponding dipole. The length and width of the ground plane correspond the radius and length of the dipole respectively. This approach is also valid to general printed monopole antennas. The simulation impedance bandwidth of the proposed antenna the range of 2.4 to 4.6 [GHz] for a voltage stand wave ratio (VSWR)${\leq}$2 and got pick gain of 6 [dBi]. So the proposed antenna is satisfied the requirement of the industry science medical (ISM) band operation.

• 한국전기전자재료학회논문지
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• 제18권12호
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• pp.1129-1132
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• 2005

The purpose of this reserch is to establish the new design technology for microwave Coplanar structure. The components in microwave circuit are classified to transmission devices, EM devices, and quasi-TEM devices. After design of these devices, we analyzed these CPWs electromagnetically using FDTD method, and suggested optimum CPW structure. In oder to realize a CPW module up to 30 GHz-100 GHz band, we research on a technology of 3-dimensional microwave CPW, and GaAs substrate with Si layer for ohmic loss. As a result this research, we suppressed the leakage, resonance, coupling, and radiation of CPW EMI, and improved resonance quality of CPW.

• 전자공학회논문지A
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• 제29A권8호
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• pp.41-48
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• 1992

The characteristics of traveling-wave electrodes for high-frequency electroptic integrated devices are described from the view point of improvement of phase-matching based on the conformal mapping method. Specific calculations of the characteristic impedance, effective microwave index, and eletrode loss for asymmetric coplanar strip(ACPS) and coplanar waveguide(CPW) electrode structures are presented as a function of the geometric electrode parameters including the electrode thickness and buffer layer thickness. 5-10(x10S0-6Tm) thick Au-ACPS electrodes were successfully fabricated by electroplating and ECR etcher. The improvement of modulation bandwidth can be theoretically observed from the combination of electrode and buffer layer thickness.

• 한국통신학회논문지
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• 제22권9호
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• pp.1968-1974
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• 1997

본 논문에서는 주파수 영역해석법을 사용하여 대칭 및 비대칭 광역 결합 동일평면 도파관 선로의 특성을 연구하였다. 이 구조는 기모드와 우모드 사이의 위상속도비가 크기 때문에 광대역특성과 결합특성을 갖는 마이크로파 회로의 설계에 유용하다. 광역결합 동일평면 도파관 선로내의 스트립의 폭과 슬롯의 폭을 조절하면서 모드 유효유전율과 특성임피던스를 얻었으며 이로부터 효율적인 설계 파라미터를 얻을 수 있다.

• 대한전자공학회논문지TC
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• 제42권7호
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• pp.41-48
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• 2005

본 연구에서는 60 GHz 대역의 무선 LAN(Wireless Local Area Network) 시스템에서 Balanced 구조를 갖는 증폭기나 믹서에 응용이 가능한 CPW(Coplanar Waveguide)구조의 Tandem 형 3-dB 방향성 결합기를 설계하고 제작하였다. 이는 기존의 edge-coupled 선로를 이용한 3 dB 결합기가 가지는 제작의 어려움과 방향성의 문제를 개선하기 위해 단일 결합선로를 다단으로 평행하게 연결한 구조이다. 우리는 소자의 크기와 제작의 용이함을 고려해, 결합계수가 -8.34 dB를 갖는 단일 결합선로를 2단으로 평행하게 연결한 구조를 채택하였다. 그리고 기존의 Tandem 결합기 제작에서 사용되어왔던 다층 기판 구조나 본딩 구조가 아닌 에어브리지 구조를 이용하여 단일 평면으로 쉽게 구현할 수 있도록 하였고, V-band(50 $\~$75 GHz)내에서 동작할 수 있도록 기생성분을 줄이고 소자 특성을 유지시켰다. 측정결과 V-band에서 완만한 3.5 $\~$4 dB의 결합도와 87.5$^{\circ}{\pm}1^{\circ}$ 의 위상차를, 60 GHz 에서는 30 dB 이상의 방향성을 확인하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제39권1호
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• pp.45-51
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• 2015

본 논문에서는 실리콘 RFIC 상에서 무선 통신 시스템의 소형화에의 응용을 위하여 마이크로스트립/코프레너 복합구조를 가지는 단파장 박막필름 전송선로의 RF특성에 관하여 연구하였다. 마이크로스트립/코프레너 복합구조를 가지는 박막필름 전송선로의 파장은 종래의 코프레너 선로에 비하여 단파장특성을 보여주고 있으며, 특히 10 GHz에서 파장이 6.26 mm로 종래의 코프레너 선로의 60.5 %이다. 또한 본 논문에서는 마이크로스트립/코프레너 복합구조를 가지는 박막필름 전송선로의 등가회로와 대역폭에 관하여 연구를 진행하였다. 등가회로는 단위 셀로 나타냈으며, 상기 등가회로의 각 소자들은 closed-form 수식을 통하여 이론적으로 계산하였다. 측정 결과 0 ~ 30 GHz 범위에서 계산수치와 측정수치가 유사하게 나온 것을 확인 할 수 있었다. 대역폭 계산결과 마이크로스트립/코프레너 복합구조를 가지는 박막필름 전송선로는 차단주파수가 377 GHz 이상의 광대역 특성을 보여주고 있다. 상기 결과들로부터 본 논문에서 제안한 전송선로를 이용하여 광대역 및 초소형 RF 수동소자로써 유용하게 사용될 수 있다는 것을 알 수 있었다.