유한차분 시간영역법을 이용한 Suspended Stripline 해석 및 필터 설계

남윤권,박동철 한국전자파학회 2002 한국전자파학회논문지 Vol.13 No.6

A simple and efficient analysis method of the suspended stripline using the finite-difference time-domain (FDTD) method is presented. New FDTD equations are derived using the contour path FDTD concept for the Yee cell which contains a dielectric sheet. The characteristic impedance and the effective dielectric constant of the suspended stripline are calculated using our proposed FDTD method. Using the calculated results, a 5-element lowpass filter is designed and fabricated. Our proposed FDTD method is validated by the measured data of the fabricated lowpass filter. 본 논문에서는 임의의 두께의 기판을 갖는 suspended stripline의 효율적인 계산을 위해 Yee cell의 내부에 두개의 유전체(공기와 기판)가 있을 때 사용할 수 있는 FDTD 수식을 유도하였으며 이를 이용하여 suspended stripline의 특성 임피던스와 유효유전율을 계산하였다. 이러한 계산결과를 이용해서 suspended stripline 5단 저역통과 필터를 설계하였고 이를 제작 측정하여 된 논문에서 제안된 FDTD법을 이용한 suspended stripline해석의 유용성을 입증하였다.

넓은 면 결합 Suspended Substrate Stripline을 이용한 직렬 커패시터의 구현

김인선,Kim, In-Seon 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.10

본 논문에서는 직렬 커패시터를 넓은 면 결합 SSS로 구현하는 새로운 이론이 제안되었다. 제안된 이론은 기모드 해석 방법만이 적용되었기 때문에 비교적 단순하지만 선로의 프린징 전자장 영향에 의한 유효 선로 폭과 선로 끝 효과를 고려함으로서 신뢰할 만한 결과를 제공한다. 이상적인 집중 소자 커패시터와 결합 선로 커패시터의 특성을 비교, 분석하기 위해 시뮬레이션 결과가 제시되었다. 또한 제안한 이론을 근거로 하여 커패시티브갭 결합 선로 대역 통과 필터가 설계 및 제작되었고, 그 결과로부터 이론의 타당성이 검증되었다. In this paper, a novel theory of realizing the series capacitor with broadside coupled suspended substrate stripline (BCSSS) is proposed. The proposed theory is relatively simple because the method of odd mode analysis is only applied: However, this theory supplies reliable result by considering the line effective width and end effect caused by the fringing field. The simulation results are presented to compare and analyze the characteristics of the ideal lumped capacitor and the coupled line capacitor. Also, the capacitive gap coupled line band-pass filter based on the proposed theory are designed and fabricated. The results prove successfully the validity of the proposed theory.

모바일 기기용 소형 금속 캔의 전자기장 결합 특성

박현호(Hyun Ho Park) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.11

본 논문에서는 모바일 기기용 소형 금속 캔으로부터 발생하는 전자기장의 누설 경로를 시뮬레이션을 통해 확인하고, IC-stripline 방법을 이용하여 전기장 및 자기장에 대한 근접장 결합(coupling) 현상을 분석하였다. 금속 캔의 윗면 개구부에 의한 전자기장 누설은 주로 자기장이 우세하고, 측면을 통한 누설은 전기장이 우세함을 확인하였다. This paper examines electromagnetic leakage path of small shield cans employed in mobile devices such as smart-phones by using numerical simulation and analyzes near-field coupling due to each of the leakage electric and magnetic fields by using IC-stripline method. From the results, it is confirmed that the leakage from the apertures or slots on the top of shield can is dominated by magnetic field, whereas the leakage from the seam on the side of shield can is mostly caused by electric field.

포탄 표면 일체형 배열 안테나용 소형 전력 분배기

신봉섭(Bong-Sup Shin),정용선(Yong-Sun Jeong),김호진(Ho-Jin Kim),민재용(Jae-Yong Min),자르갈사이칸 나이암바얄(Jargalsaikhan Nyambayar) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.1

This paper presents a small power divider for conformal array antennas on artillery projectiles. The proposed power divider distributes the power supplied to a 50Ω coaxial cable to 50NΩ coaxial outputs placed on the circumference of a circular printed circuit board. The proposed power divider has a structure where the input cable is connected to each output cable with a quarter-wave stripline impedance transformer with a characteristic impedance of 50 √NΩ. A via hole is utilized to connect the coaxial cable with the stripline. Parallel plate waveguide modes are suppressed by using grounded via holes around the stripline. The proposed structure is applied to the design of 1:2, 1:3 and 1:4 power dividers. A 1:2 power divider is fabricated to verify the validity of the design. Measurements show that the fabricated power divider has a bandwidth of 117% at S-band and a transmission coefficient of -3.10dB and -3.28dB at the center frequency.

공동공진기를 이용한 무접점 전력 전송 장치 설계

장대순(Tae-Soon Chang),김용남(Yong-Nam Kim),허정(Jung Hur) 한국전자파학회 2011 한국전자파학회논문지 Vol.22 No.11

본 논문은 공동공진기(cavity resonator)와 스트립라인(stripline) 구조를 이용하여 전력을 전송할 수 있도록 구현한 무접점 전력 전송 장치에 관한 것이다. 전력 전송 시 송수신기가 밀착된 상태에서 구현되는 무접점 전력 전송 방식으로, 외부에 도체 단자가 없어 송수신기가 전기적으로 분리되며, 전력 송수신에 필요한 수신부의 크기를 최소화할 수 있다. 공진기용 공동(cavity)의 윗면 도체판에 입력 포트 및 출력 포트용 슬롯(slot)을 구성하고, 그 위에 스트립라인 구조를 이용하여 입력 포트와 출력 포트를 형성한 공동공진기에서, 출력 포트의 일부를 분리하여 탈착 가능하도록 전력수신부를 형성하고, 이 전력수신부를 제외한 나머지 부분 즉, 스트립라인-슬롯 결합(coupling)된 입력 포트, 공동공진기, 출력 포트용 슬롯 등은 모두 전력송신부에 포함시킴으로 전력 전송 장치를 송수신기로 분리하여 제작할 수 있다. 이 송수신기를 결합시키면 마치 하나의 공진기 내에서 입력 포트에서 출력 포트로 전력이 전달되는 형태가 된다. 제작된 무접점 전력 전송 장치의 중심 주파수는 5.782 GHz이며, 이 때 측정된 S₂₁값은 -1.07 dB로 나타나 약 78 %의 높은 전력 전송율을 갖는 것을 확인하였다. In this paper, we introduce the contactless power transmission device for transmitting the power with the resonant characteristic of the cavity resonator. When transmitting the power, the contactless power transmission device begins to work in the condition where the transceiver adheres closely. The transceiver is electrically separated because there is no conductive terminal outside and the size of the receiver required for the electric power transmission can be minimized. The cavity resonator comprises slots for the input port and output port in the upper side conductor plate of the cavity and forms the input port and output port using the stripline structure at this upper part. The some of output port is separated from it and the electric power receiver is formed thus the union can be possible. The rest except electric power receiver become the electric power transmitter, which includes the input port of stripline-slot coupling, cavity, and the slot of the output port. If the transmitter and the receiver are combined, they become the form in which the electricity is transferred from the input port to the output port in a cavity resonator. The center frequency of the contactless power transmitter manufactured is 5.782 GHz. and S₂₁ is measured as -1.07 dB. It is confirmed that the high electric power transfer rate is approximately 78 %.

New Expression for the Current Induced in a Strip for the Fringe Field Effect in a Circular Cross-section Stripline

Mukesh Kumar 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.9

The induced current (fraction of the wall current) flowing through a strip is a very crucial quantity in stripline-type pick-ups and kickers. Quantities like the output voltage, coupling impedance and kicker constant depend on the fraction of the wall current flowing through the strip. Due to the fringe field at the side edges of the strip the effective angular width of the strip and, hence, the fraction of the wall current intercepted by the strip is enhanced. This paper presents a calculation, by using CST EM studio, of the fraction of the wall current intercepted by the strip. A correction factor for the effect of the fringe field on the current induced in the strip is also presented. The results obtained through simulations and through a new expression are compared with earlier existing expressions.

A compact spiral stripline-loaded monopole antenna with a vertical ground plane

Khang Nguyen, Truong,Lee, Keekeun,Choo, Hosung,Park, Ikmo Wiley Subscription Services, Inc., A Wiley Company 2008 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.50 No.1

<P>In this letter, we propose a compact spiral stripline-loaded monopole antenna on a vertical ground plane. The measured results show that the antenna has a fractional bandwidth of 12.1% for a voltage standing wave ratio (VSWR) less than 2 at the center frequency of 1.10 GHz, as well as a good omni-directional radiation pattern. The small size of 0.04 λ<SUB>o</SUB> × 0.04 λ<SUB>o</SUB> × 0.04 λ<SUB>o</SUB> makes it promising for use as an internal antenna in mobile handsets. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 250–252, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23043</P>

Uncertainty of S-Parameter Measurements on PCBs due to Imperfections in the TRL Line Standard

구현지,Martin Salter,강노원,Nick Ridler,홍영표 한국전자파학회 2021 Journal of Electromagnetic Engineering and Science Vol.21 No.5

This paper evaluates the uncertainty of S-parameter measurements on multilayer printed circuit boards (PCBs) due to the uncertainties of the dimensions and dielectric properties of the line standard in the Thru-Reflect-Line (TRL) calibration. This evaluation is performed in two ways: one is based on repeated TRL calibrations with a randomly perturbed line standard, and the other is based on equations given by Stumper. The two methods require the uncertainties of the S-parameters of the TRL line standard, which are obtained from the uncertainties of the dimensions and dielectric properties using three-dimensional electromagnetic Monte Carlo simulation. The two methods agree well with each other. This study also shows how to apply impedance renormalization in Stumper’s equations. We design the TRL standards and the devices under test (DUTs) in PCB stripline and precisely measure the cross-sectional dimensions of the fabricated striplines. Uncertainty analysis based on the measured values enables us to investigate the impact of realistic deviations in the dimensions of the TRL line standard on the S-parameter measurement uncertainty of the DUTs. Finally, as an example, we evaluated the uncertainty in the measured S-parameters of a Beatty line on the fabricated PCB.

마이크로파 가변 소자용 K-band Coplanar Stripline 공진기 설계

강종윤,윤석진,김현재,Kang, Chong-Yun,Yoon, Seok-Jin,Kim, Hyun-Jai 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.6

In order to develop a tunable resonator which can be easily operated by DC bias and applied for microwave tunable filters and devices using ferroelectric thin or thick films, the non conductor backed-and conductor backed- coplanar stripline resonators have been designed and analyzed. They have been designed to be operated at 25 GHz which involve coplanar stripline input and output ports. The resonators have been simulated and analyzed using Ansoft HFSS. The research has been focused on the Quality factor of the coplanar stripline resonator. The conductor Q, box Q, and radiation Q of the resonators have been analyzed and calculated according to the substrate thickness & conductor width of the resonators. From these parameters, the loss factors of the coplanar stripline resonator have been investigated. The conducting Q of the coplanar stripline resonator has no relation with the thickness of dielectric substrate and increases as the conductor width increases. The box Q has no much relation with the thickness of substrate and the conductor width, which is above 2000. The radiation loss increases as the thickness of substrate and the conductor width increase. To decrease the radiation loss of the coplanar stripline resonator, a conductor backed coplanar stripline resonator has been proposed which has the unloaded Q of 170.

밀리미터파 초소형 레이다용 광대역 DSPSL-CPS 전이구조 설계

김영곤,박창현,김홍락,권준범 한국인터넷방송통신학회 2017 한국인터넷방송통신학회 논문지 Vol.17 No.6

A high-performance wideband transition from double-sided parallel-stripline (DSPSL) to coplanar stripline (CPS) is proposed. This transition is designed by consideration of gradual field transformation and optimal impedance matching between DSPSL and CPS. Clear design guidelines of proposed transition are provided to determine the ground shape and the transition length. The fabricated transition exhibits less than 0.7 dB insertion loss per transition for frequencies from 6.2 to 18.2 GHz, and less than 1.25 dB insertion loss to over 30 GHz. 본 논문에서는 낮은 삽입 손실을 가지는 광대역 DSPSL (double-sided parallel-stripline) - CPS (coplanar stripline) 전이구조를 제안하였다. 제안하는 전이구조는 자연스러운 전계분포의 필드 변환과 DSPSL과 CPS 사이의 임피던스 정합의 관점에서 설계되었다. 전이구조의 명확한 설계방법을 제시하여 바닥면 그라운드의 변화와 전이구조의 길이를 결정할 수 있게 하였다. 설계의 제작된 전이구조의 특성은 전이구조 당 6.2 ~ 18.2 GHz의 대역에서 0.7 dB의낮은 삽입 손실을 가지고 있으며, 6.2 ~ 30 GHz 이상의 대역에서 1.25 dB의 삽입 손실을 가짐을 확인하였다.