• Title/Summary/Keyword: Circuit-Concept Approach

Search Result 34, Processing Time 0.022 seconds

Equivalent Network Modeling of Slot-Coupled Microstripline to Waveguide Transition (슬롯 결합 마이크로스트립라인-도파관 천이기의 등가 회로 모델링)

  • Kim Won-Ho;Shin Jong-Woo;Kim Jeong-Phill
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.15 no.10 s.89
    • /
    • pp.1005-1010
    • /
    • 2004
  • An analysis method of slot-coupled microstripline to waveguide transition is presented to developed a simple but accurate equivalent circuit model. The equivalent circuit consists of an ideal transformer, microstrip open stub, and admittance elements looking into a waveguide and a half space of feed side from a slot center. The related circuit element values are calculated by applying the reciprocity theorem, the Fourier transform and series representation, the complex power concept, and the spectral-domain immittance approach. The computed scattering parameters are compared with the measured, and good agreement validates the simplicity and accuracy of the proposed equivalent circuit model.

Response of angled two-strip transmission lines to the incdent angle of an external electromagnetic field, I : Circuit-concept analysis (외부 전자파의 입사방향에 대한 각진 두 스트립으로 구성된 전송선의 반응, I:회로개념의 해석)

  • 홍성용;김세윤;라정웅
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.3 no.2
    • /
    • pp.3-9
    • /
    • 1992
  • The reponse of the angled two-strip transmission lines illuminated by an external electromagnetic field is estimated by using the circuit concept approach. Calculated terminal voltages reveal convergence to a fixed value as the number of discretization increases. The amplitude patterns of two terminal voltages to all the direction and polarization of the incident field are also calculated.

  • PDF

THE GRAPHICAL D-Q TRANSFORMATION OF GENERAL POWER SWITCHING CONVERTERS

  • Rim, Chun-T.;Hu, Dong-Y.;Cho, Gyu-H.
    • Proceedings of the KIEE Conference
    • /
    • 1988.11a
    • /
    • pp.388-393
    • /
    • 1988
  • New circuit D-Q transformation concept is introduced to analyze AC converters such as inverters, rectifiers and cyclo-converters with ease. The equivalent linear time invariant circuit is obtained by substituting switches with equivalent turn-ratio variable transformers and changing balanced AC reactors into equivalent DC reactors combined by gyrators. This circuit enables us to utilize the powerful linear system analysis techniques such as Laplace transform otherwise which could not be applied to the time varying switching systems. Direct substitution of switches of DC converters with transformers is shown as a preliminary. Then the modeling procedure is shown for a controlled rectifier-inverter circuit. Finally an analysis example is proposed for a buck-boost inverter and the result is compared with the conventional approach. This approach is applicable to all AC converter families to determine the AC transfer functions and the DC operating points. It is identified that the switching systems are equivalent to the RLC filter circuits with transformers and gyrators.

  • PDF

Crosstalk Analysis of Bent Coupled Lines on a PCB (PCB상에 놓여 있는 굽은 결합 선로의 누화 해석)

  • Han, Jae-Kwon;Park, Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.18 no.2 s.117
    • /
    • pp.191-198
    • /
    • 2007
  • The electromagnetic coupling between transmission lines in PCB design can degrade the performance of equipment operations. The coupling phenomenon is caused by electromagnetic fields generated by the currents on the transmission lines and the risers. In this paper, an improved method of crosstalk analysis for bent coupled lines on a PCB is proposed and investigated. In the previous cascading method combined with circuit-concept approach, bent coupled lines are devided into sections and each section is represented by ABCD matrix and then they are cascaded. In the proposed method, the crosstalk of bent coupled lines is calculated by the modified circuit-concept approach, where the coupled region is not restricted to the region projected by a generator line on a receptor line but is the total length of receptor line in calculating the forcing terms. Finally, the accuracy of the proposed approach is verified by comparing the calculated results with the measured ones for several bent coupled-line examples.

Analysis of Via Fence Effects in PCB Transmission Lines (PCB 전송선에서 비아 펜스의 효과 분석)

  • Kim Jong-Ho;Park Sang-Wook;Ju Jae-Cheol;Park Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.16 no.4 s.95
    • /
    • pp.402-409
    • /
    • 2005
  • In analog and digital electronic systems, crosstalk between transmission lines on the printed circuit board can degrade the performance of equipment operations. This paper presents a technique to analyze the effects of via fence, which is based on additional transmission lines grounded by vias. The technique is composed of a circuit concept approach for transmission line sections md an impedance modeling of via hole sections. All sections are represented by ABCD parameters and they are cascaded. Finally, this technique was verified by comparing the measurement results with the simulation ones.

Conceptual Understanding Process for Electric Circuit of Elementary Science-gifted Students using Dynamic Science Assessment (역동적 과학 평가를 통한 초등과학 영재들의 전기회로 개념 이해 과정 분석)

  • Hong, Hyun-Ju;Kim, Jung-Bog;Choi, Byung-Soon;Lee, Jung-Sook
    • Journal of Gifted/Talented Education
    • /
    • v.22 no.3
    • /
    • pp.703-728
    • /
    • 2012
  • The purpose of this study was exploring instructive methods to make each gifted child's ability develop as more by selecting the dynamic method instead of existing static method in teaching and evaluating science-gifted students in elementary school and by analyzing conceptual change of electric circuit. In this research, 11 science-gifted students in primary school were chosen, and Dynamic Science Assessment(DSA) intended to comprehension of scientific electric circuit concept was performed as focusing on scaffolding aspects in order to find the transition process. And then, the features on transition process of students' concept were analyzed in quality. The results of the study were checked that the features of useful scaffolding input with respect to comprehending concepts of science gifted-students by using DSA. The less familiar to approach the subjects, the more presented numbers of scaffolding showed. As coming toward transition and same questions, scaffoldings (interactions) were declined because their level of transition was higher than before. Various ways were used in helping the students comprehend the concept on the method of connecting electric circuit and the emitting amount of current, which acted to adapt to daily life.

Analysis of Crosstalk Reduction by Metal Filled Via Hole Fence in Bent Transmission Lines (구부러진 전송선에서 비아 홀 펜스에 의한 누화 감소 해석)

  • Kim Jong-Ho;Han Jae-Kwon;Park Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.16 no.10 s.101
    • /
    • pp.1036-1042
    • /
    • 2005
  • The crosstalk between bent transmission lines and the effects of additional trace with the metal filled via holes on alleviating the crosstalk are investigated using the circuit concept approach for transmission line sections and impedance modeling for via hole sections. All sections are represented by ABCD matrices and then cascaded. Finally the calculated results by proposed method are confirmed that they agree with the measured results in less than 3 dB except a band of low frequency.

Network Analysis and Design of Aperture-Coupled Cavity-Fed Microstrip Patch Antenna (개구면 결합 공진기 급전 마이크로스트립 패치 안테나의 회로망 해석 및 설계)

  • Shin Jong Woo;Kim Jeong Phill
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.41 no.12
    • /
    • pp.93-102
    • /
    • 2004
  • This paper presents a general theory for the analysis of an aperture-coupled cavity-fed microstrip patch antenna to develop a simple but accurate equivalent circuit model. The developed equivalent circuit consists of ideal transformers, admittance elements, and transmission lines. These circuit element values are computed by applying the complex power concept, the Fourier transform and series representation, and the spectral-domain immittance approach. The input impedance of the antenna is calculated and compared with the published data. Good agreements validate the simplicity and accuracy of the developed equivalent circuit model.

Crosstalk Analysis of Coupled Lines Connected with Vias in a 4-Layer PCB (4층 기판에서 비아로 연결된 결합 선로의 누화 해석)

  • Han Jae-Kwon;Park Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.17 no.6 s.109
    • /
    • pp.529-537
    • /
    • 2006
  • Multi-layer PCBs are of ien used In compact microwave circuit design as density of PCB layout is increased. In this paper, the crosstalk between coupled lines connected with vias in a 4-layer PCB is investigated theoretically based on the circiuit-concept approach. Coupled lines connected with vias in a 4-layer PCB are divided into three sections, which are coupled microstrip lines and upper via section, center via section, and lower via and coupled microstrip lines section, respectively. Each section is represented by ABCD matrix. By cascading these three ABCD matrices crosstalk between coupled lines connected with vias in a 4-layer PCB is approximately calculated. The validity of this theoretical approach is verified by comparing the calculated results with the simulated ones using HFSS.

A Study on the Development of Stand-Alone Model for Power Converter Circuit Simulation (전력변환회로의 독립형 시뮬레이션모델 구축에 관한 연구)

  • 정승기
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.3 no.4
    • /
    • pp.353-364
    • /
    • 1998
  • This paper presents a systematic approach to the modeling of power electronic circuits with systemlongrightarrowlevel simulation l languages. It is shown that a circuit model reduces to one of four basic types according to input/output conditions. The e elementary models for single series components and shunt components are derived which are integrated to develop a m model of given converter circuit. The constraints imposed on the model development-matching input/output conditions a and avoiding algebraic loop-are discussed in relation to the realization example of a buck converter circuit model. It is s shown that the constraints can always be fullfilled by introducing fictitious interface blocks, which is generalized to the c concept of model transformation.

  • PDF