• Title, Summary, Keyword: Meander

Search Result 274, Processing Time 0.157 seconds

The Characterization and Analysis of the simulated meander inductor for RF application (RF 응용을 위한 meander 인덕터의 특성 및 분석연구)

  • Kim, Sung-Hoon;Lee, Yong-Jun;Chang, Kun-Hyuk;Koh, Jung-Hyuk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.352-352
    • /
    • 2008
  • 폐 자기회로 구조를 갖는 Meander 형태의 Inductor 설계를 위해 HFSS 프로그램을 이용하여 Meander Inductor를 시뮬레이션 하였다. Meander Inductor의 turn 수(N) 및 폭(W), 두께(T), 랩(G)의 변화에 따른 인덕턴스(L), S-parameter(S)와 Q-factor(Q)의 변화를 HFSS 를 통해 측정하였다. Al2O3 기판과 MgO의 두께는 각각 680um, 50um로 고정하였고, silver electrode를 이용하여 Meander 타입의 Inductor를 설계하였다. Meander Inductor의 turn수(6,7,8turn)의 변화를 측정한 결과, 8턴이었을 때 Q-factor가 19로서 가장 높은 결과를 얻었다. L의 결과 값은 공진 주파수와 의 관계에 의해 6turn일 때 L값은 17GHz에서 공진현상이 나타났다. 또한 W, G, T에 변화를 주어 설계한 뒤 시뮬레이션의 결과 값을 측정하였다. 그 값을 서로 비교한 결과, 변수들의 변화에 따라 L값과 Q-factor가 변화되었다. 이 논문에서는 각 변수에 따른 meander inductor의 특성을 HFSS 시뮬레이션을 통해 비교하고자 한다.

  • PDF

Quench Distribution in AU/YBCO Thin Film Meander Lines with a Au Meander Line Heater (금선 히터가 있는 금/YBCO 박막 선에서의 퀜치 분포)

  • Kim, H. R.;J. W. Shim;O. B. Hyun;J. M. Oh
    • Progress in Superconductivity
    • /
    • v.5 no.2
    • /
    • pp.118-123
    • /
    • 2004
  • We investigated quench distribution in AU/YBCO thin film meander lines with a heater. Quench distribution during faults is important for superconducting fault current limter applications, because uniform quench allows application of higher voltages across the meander lines. AU/YBCO thin films grown on sapphire substrates were patterned into meander lines by photolithography. Gold films grown on the rear sides of the substrates were also patterned into meander lines, and used as heaters. Meander lines on the front and the rear sides were connected in parallel. The meander lines were subjected to simulated AC fault currents for quench measurements during faults. They were immersed in liquid nitrogen during the experiment for effective cooling. Resistance of the AU/YBCO meander lines initially increased more rapidly with the rear heater than without, and consequently the fault current was limited more. The resistance subsequently became similar, The resistance distribution was more uniform with the heater, especially during the initial quench. Quench was completed more uniformly and significantly earlier. This resulted in uniform distribution of dissipated power. These results could be explained with the concept of quench propagation, which was accelerated by heat transfer across the substrate from the rear heater.

  • PDF

High Frequency Simulations for the Meander Type Inductors on the MgO and Al2O3 Substrates (산화마그네슘 기판과 산화알루미늄 기판을 이용한 Meander 형태 인덕터의 고주파 시뮬레이션)

  • Ham, Yong-Su;Kim, Sung-Hun;Kang, Ey-Goo;Koh, Jung-Hyuk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.22 no.8
    • /
    • pp.641-644
    • /
    • 2009
  • We have studied on the microwave characteristics for the meander type inductors on the MgO substrates and $Al_2O_3$ substrates by employing 3-D high frequency simulation, respectively. Proper designs of meander type inductors were proposed and confirmed through the high frequency simulations, 5, 7, 9, 11, and 13 turns meander type inductors have been choose to analyze the electrical properties for the microwave passive component applications. The Al top electrodes have 282 nm length, 45 nm width, 100 nm thickness and 15 nm gap. The simulations were carried out from 50 MHz to 30 GHz, Frequency dependent inductances and quality factor were calculated by employing the equivalent circuit model of meander type inductors. The self resonances frequency of meander type inductor were shifted from high frequency to low frequency range as the number of the turn of inductors was increased. From the microwave simulations, the inductances and quality factors of meander type inductors were extracted through the scattering parameter.

A Study on the Small Chip Meander Antenna for Dual-frequency Operation (이중공진 소형 칩 Meander 안테나에 관한 연구)

  • 김현준;권세웅;심성훈;강종윤;윤석진;김현재;윤영중
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.13 no.7
    • /
    • pp.633-640
    • /
    • 2002
  • In this paper, the small chip meander antenna for dual-frequency operation is presented. The proposed chip meander antennas was fabricated by the ceramic chip using LTCC-MLC process. It is a novel compact dual-frequency design using a meandered patch that achieves more degrees of freedom for adjusting dual-frequency operation and the size reduction with narrow frequency ratio. And it is proposed that the 3D structure for additional size reduction of the meander antenna. The size reduction of the 3D meander antenna is as large as 50 % as compared to the design for dual-frequency operation not using 3D structure. It is observed that the principle of dual-frequency operation through current distribution, return loss and radiation pattern.

Triple-band Compact Chip Antenna using Coupled Meanderline Structure for Mobile RFID/PCS/WiBro (결합 미엔더 선로을 이용한 모바일 RFID/PCS/WiBro 삼중 대역 소형 칩 안테나)

  • Lim, Hyung-Jun;Lee, Hong-Min
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
    • /
    • /
    • pp.225-230
    • /
    • 2005
  • The proposed Triple-band Compact Chip Antenna using Coupled Meander line and stacked meander Structure for Mobile RFID/PCS/WiBro. The proposed antenna is designed to operate at 900, 1800, and 2350 MHz, and is realized by parasitic coupled and stacked a meander line. Meander lines are using extend length of effective current path more than monopole and contribute miniaturization. The coupled meander line controls the excitations of the Mobile RFID and PCS, stacked meander line controls the excitation of the WiBro. The proposed antenna size is $11mm\times22.5mm\times1mm$. The antenna supports 900MHz, 1800MHz and 2350MHz operations simultaneously with bandwidths of 33MHz, 230MHz and 100MHz, respectively. The proposed antenna gains are result of simulation to be -0.8dBi, 3dBi and 3.8dBi, respectively.

  • PDF

Resistance Development in Au/YBCO Thin Film Meander Lines under High-Power Fault Conditions (과도 사고 시 Au/YBCO 박막 곡선의 저항 거동)

  • Kim, H.R.;Sim, J.;Choi, I.J.;Yim, S.W.;Hyun, O.B.
    • Progress in Superconductivity
    • /
    • v.8 no.1
    • /
    • pp.81-86
    • /
    • 2006
  • We investigated resistance development in $Au/YBa_2Cu_3O_7(YBCO)$ thin film meander lines during high-power faults. The meander lines were fabricated by patterning 300 nm thick YBCO films coated with 200 nm thick gold layers into meander lines. A gold film grown on the back side of the substrate was also patterned into a meander line. The front meander line was connected to a high-power fault-test circuit and the back line to a DC power supply. Resistance of both lines was measured during the fault. They were immersed in liquid nitrogen during the experiment. Behavior of the resistance development prior to quench completion could be understood better by comparing resistance of the front meander lines with that of the back. Quench completion point could be determined clearly. Resistance and temperature at the quench completion point were not affected by applied field strength. The experimental results were analyzed quantitatively with the concept of heat transfer within the meander lines/substrate and to the surrounding liquid nitrogen. In analysis, the fault period was divided into three regions: flux-flow region, region prior to quench completion, and region after quench completion. Resistance was calculated for each region, reflecting the observation for quench completion. The calculated resistance in three regions was joined seamlessly and agreed well with data.

  • PDF

A Study on a Meander line employing Periodic Patterned Ground Structure on GaAs MMIC (GaAs MMIC 상에서 주기적 접지구조를 가지는 미앤더 선로에 관한 연구)

  • Jung, Bo-Ra;Yun, Young
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.34 no.2
    • /
    • pp.325-331
    • /
    • 2010
  • In this study, highly miniaturized short-wavelength meander line employing eriodically patterned ground structure (PPGS) was developed for application to miniaturized on-chip passive component on GaAs MMIC (monolithic microwave integrated circuit). The meander line employing PPGS showed shorter wavelength and slow-wave characteristic compared with conventional meander line. The wavelength of the meander line employing PPGS structure was 17 % of the conventional meander line on GaAs MMIC. Due to its slow-wave structure, the meander line employing PPGS exhibited large propagation constant than conventional meander line, which resulted in larger phase shift and shunt inductance value. Above results indicate that the meander line employing PPGS is a promising candidate for application to a development of miniaturized on-chip RF components as well as inductor with a high inductance value on GaAs MMIC.

Morphometrical characteristics of River Meandering (하천 사행의 계량형태학적 특성)

  • 이재우;이원환
    • Water for future
    • /
    • v.14 no.1
    • /
    • pp.39-49
    • /
    • 1981
  • The purpose of this study is to examine the meander charactericstics for the rivers in Korea..In this study, the new characteristics factors of meander are proposed, and the relationships among the factors proposed in this study and the existing factors are derived. An attempt is made to find considerable relation among meander characteristics, but width and meander belt did not show any defined trend and considerable scatter of points was observed. Relationships among the meander length, belt and flowrate, etc., which are factors of meander characteristics, are analyzed the 67 rivers above 30km in length. Channel shape factor which is the ratio of the length from the starting point to the end to the channel lenght, tortuosity which is the ratio of the curved channel length against the channel length are suggested for a new characteristics factor of meander. They are well correlated with channel length, Horton's shape facotr and meander gradient, consequently have to be important measures of river meander. The result of the detailed comparison and the analysis of degree of sinuosity, velocity and water surface slop are brought light on the fact show that the curved reach is morestable than the straight one. The ratio of the meander length to the meander belt and its accumulative frequency showed excellent correlationship when plotted on the semi-log paper. The results of regression analysis of meander belt and meander length show linear for the South Han river branches and power curve for the Geum river and the Nakdong river branches.

  • PDF

Analytic Derivation of Single Transmission Line Parameters for Weakly Coupled Meander Line (약 결합된 Meander Line의 단일전송선 Parameter의 해석적 계산)

  • 염경환;강명숙
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.11 no.5
    • /
    • pp.738-747
    • /
    • 2000
  • In this paper it is shown that the meander line at the low frequency can be thought as the single transmission line whose characteristic impedance is approximately equal to that without coupling. But the length is contracted from that without coupling. The approximate contraction ratio is derived for weak coupling and is compared with the circuit simulation results and the EM simulation results. The formula are in good agreement with the simulation results in weak coupling.

  • PDF

Slow Wave Circuits for Traveling-Wave-Type Amplifiers (진행파형 증폭기를 위한 저속파회로)

  • 김봉열;황금찬
    • Journal of the Korean Institute of Telematics and Electronics
    • /
    • v.7 no.2
    • /
    • pp.13-20
    • /
    • 1970
  • The dispersion characteristics of tape meander line were analyzed by electromagnetic field theory. The several different tape meander lines were photoetched on copper printed-bakelit substrate, and these tape meander line structures were inserted into the X-band waveguide. Phase bridge method was used for the dispersion characteristics measurement of meanderline. The measured. results were plotted on diagram(Brillouin diagram) and compared with theoretical values. Measured results were consistent with theoretical Values. But, on the measured diagram, passband midfrequency was lower than theoretical value. It was believed that the discrepancy was due to the backelite loading. The group velocity of stagger tuned meander line was higher than that of uniform meander live, and the freqnency band of constant group velocity of stagger tuned meanderline was sider than that of uniform meander line.

  • PDF