• Title/Summary/Keyword: Multiple Coupled Line

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The Analysis of Interdigital Multiple Coupled Microtrip Line DC Blocks (깍지낀 복수 결합 마이크로스트선 DC블럭)

  • 진연강
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.11 no.2
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    • pp.146-151
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    • 1986
  • The analysis procedure for open-circuited interdigital multiple coupled microstrip-line structures for applications as wideband DC blocks are presented. The exact frequency responses for the transmission coefficient computed by utilizing the quasi-TEM parameters of coupled microstrip lines are shown.

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An Indoor Broadcasting System Using Light-Emitting Diode Lamps Coupled with Power Line

  • Lee, Seong-Ho
    • Journal of Sensor Science and Technology
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    • v.24 no.5
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    • pp.342-347
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    • 2015
  • We introduce an indoor broadcasting system using light-emitting diode (LED) lamps coupled with a 220 V power line. Two couplers connected to the power line constitute a power line communication (PLC) link. The transmission path from an LED lamp to a photodetector forms a visible light communication (VLC) link in free space. When the LED lamp is coupled to the power line, a composite PLC-VLC link is formed, making it possible to transmit a VLC signal beyond line-of-sight. In experiments, a 4 kHz analog signal modulated with a 100 kHz carrier was sent to the power line by a PLC coupler, and LED lamps coupled to the power line detected the signal and radiated it to multiple VLC receivers in the room. This configuration is useful in expanding an indoor VLC sensor network to adjacent rooms or constructing a voice broadcasting system in a building or apartments with existing power lines.

MMIC Transversal Filter using Multiple-Coupled-Line Directional Couplers (다중결합선로 방향성 결합기를 이용한 MMIC 트랜스버살 필터)

  • 지기만;박동철
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.10
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    • pp.996-1003
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    • 2003
  • There are critical drawbacks in fabricating MMIC transversal filters because the length of the conventional transversal filter structure is much longer than the width. In order to solve this structural problem, a transversal filter using multiple-coupled-line directional couplers which can achieve tight coupling is proposed. The length of the proposed transversal filter can be made short using multiple-coupled-line couplers so that the structure of the proposed filter is applicable to MMIC technology. Because of the dielectric and conductor losses, the excited signal at the input port becomes smaller when it progresses through each directional coupler. Therefore, the strength of the coupled signals at the latter directional couplers becomes smaller than the designed one and this, in turn, gives rise to performance aggravation. A modified coupling coefficient formula to prevent frequency characteristic degradation is introduced. The proposed filter structure and the design method are verified by the calculated result and 3D full-wave analysis.

Analysis of multiple coupled microstrip lines on a magnetized ferrite substrate (자화된 페라이트 기판상의 다중 결합 마이크로스트립 선로 해석)

  • 문영찬;윤상원;창익수
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.5
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    • pp.65-74
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    • 1996
  • in this paper, the propagation characteristics of the dominant modes in multiple coupled microstrip lines on a magnetized ferrite substrate are analyzed. The propagation constants and characteristic impedances are calculated by using the spectral domain method. With the numerical results, multi-port impedance parameters as well as scattering parameters are derived from nonreciprocal transmission line equations which are consistent with conventional transmission line theory. In additon, the numerical resutls of nonreciprocal characteristics for various values of structural, material parameters, and external magnetic fields are also presented.

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Influence of Asymmetric Aerodynamic Loading on Multiple Unit Floating Offshore Wind Turbine (부유식 다수 풍력 발전기에 작용하는 비대칭 공력 하중의 영향)

  • Bae, Yoon Hyeok;Kim, Moo-Hyun
    • Journal of Ocean Engineering and Technology
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    • v.29 no.3
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    • pp.255-262
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    • 2015
  • The present study developed a numerical simulation tool for the coupled dynamic analysis of multiple turbines on a single floater (or Multiple Unit Floating Offshore Wind Turbine (MUFOWT)) in the time domain, considering the multiple-turbine aero-blade-tower dynamics and control, mooring dynamics, and platform motions. The numerical tool developed in this study was designed based on and extended from the single-turbine analysis tool FAST to make it suitable for multiple turbines. For the hydrodynamic loadings of floating platform and mooring-line dynamics, the CHARM3D program developed by the authors was incorporated. Thus, the coupled dynamic behavior of a floating base with multiple turbines and mooring lines can be simulated in the time domain. To investigate the effect of asymmetric aerodynamic loading on the global performance and mooring line tensions of the MUFOWT, one turbine failure case with a fully feathered blade pitch angle was simulated and checked. The aerodynamic interference between adjacent turbines, including the wake effect, was not considered in this study to more clearly demonstrate the influence of the asymmetric aerodynamic loading on the MUFOWT. The analysis shows that the unbalanced aerodynamic loading from one turbine in MUFOWT may induce appreciable changes in the performance of the floating platform and mooring system.

A Design of Multiple Microstrip Line Coupled Circuit for Microwave Integrated Circuit (마이크로파 집적회로를 이용한 복수 마이크로스트립선 결합회로의 설계)

  • Park, Yhl;Kang, Hee-Chang;Chin, Youn-Kang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.16 no.9
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    • pp.862-876
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    • 1991
  • In this theses, the procedure for finding the equivalent immittance of an n-line coupled structures is presented in terms of the normal mode parameters of the n-line coupled system. The above generalized equations can be applied to the various Coupled structures including directional couplers, DC blocks, bandpass/band elimination filters, and various other uniformly coupled filters. The design equations are based on a simplified TEM(Quasi TEM) mode. The obtained results and the definition of the scattering parameters for a general coupled line four port with arbitrary terminations are used to present the procedure to determine the optimum physical dimensions matching the given load impedances connected to input, output port. Multiple coupled rnicrostrip two-port with three lines circuit designed shows little discrepancy between the conventional method and this one. Four port with five lines were fabricated on teflon substrate($e$r=2.55) with its thickness h=l.588mm designed at the center frequency, 4 GHz. Their measured results are fairly close to the ones by computation.

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A novel transversal filter with improved spurious characteristics (스퓨리어스 특성이 개선된 새로운 구조의 트랜스버살 필터)

  • Jee, Ki-Mann
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.611-621
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    • 2003
  • A spurious-suppressed transversal filter using the multiple-coupled line is proposed. The frequency characteristics of the multiple-coupled line are analyzed in detail. In order to compare the performances, the novel spurious-suppressed transversal filter using triple-coupled half-wavelength directional couplers is designed at 5 GHz. The spurious-suppression characteristics of the proposed transversal filter are verified by the full wave analysis and the measurement. The spurious response of the fabricated filter is effectively suppressed up to 13 GHz and the large attenuation is attained in the stopband.

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Design of miniaturized power divider multiple coupled line on RFIC/MMIC for application to vessel wireless communication components (선박 무선통신소자에의 응용을 위한 다중결합 선로를 이용한 RFIC/MMIC용 초소형 전력분배기의 설계)

  • Lee, Dong-Hwan;Yun, Young
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.401-405
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    • 2005
  • This paper proposed a miniaturization passive element employing the multiple microstrip line. As a result of this method, we realized the transmission line miniaturized. The applying structure designed and evaluated a power divider on GaAS MMIC circuit. It draws a plan in a center Frequency as the observation could do good characteristic.

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Design of Interdigitated Multiple Coupled Microstrip Filter/DC Blocks for Microwave Integrated Circuits (초고주파 집적회로를 위한 깍지낀 복수 결합 마이크로스트립 광대역 필터/DC 블록의 설계)

  • Chin, Youn-Kang
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.24 no.5
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    • pp.747-752
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    • 1987
  • Analysis and design procedures for both symmetrical and non-symmetrical open-circuited interdigital multiple coupled microstrip line structures for applications as wide-band DC blocks/filters have been presented. The design equations, as is the case of other microstrip structures, are based on a simplified TEM model. The experimental results are in good agreement with the theoretically predicted ones.

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A Study on Crosstalk in High Speed Digital Signal Transmission Line (고속 디지털 신호 전송선로에서의 Crosstalk 에 관한 연구)

  • 김세영;장상건;남상식;박항구;신연강
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.8
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    • pp.16-25
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    • 1994
  • The prediction of crosstalk in one of important problems in estimating the EMC of a system for high speed digital signal transmission. Crosstalk curves are shown in terms of characteristic impedance of lines spacing between lines and rise time of pulse by using general multiple coupled transmission line equation and harmonic-balance method. The coupled symmetrical two-line on dielectric material epoxy-glass FR 4(${\varepsilon}_r$), is fabricated to measure crosstalk occuring at the near end and far end of the passive line. The inter-line is inserted to reduce crosstalk between two microstrip lines. The simulation results and the measurement results are shown and found to be very close.

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