Simulation of single and coupled transmission lines using time-domain scattering parameters

Bandurski, Wojciech

doi:10.1109/81.873876

Cited by 25 publications

(19 citation statements)

References 19 publications

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“…The decoupling estimation was achieved by forward transmission gain (S21) measurements (8). The simulation was conducted both with the unloaded coils and with a load constituted by a parallelepiped phantom whose dielectric properties meet the ASTM (American Society for Testing and Material) criteria for MR phantom developing (e r 5 80, r 5 0.6 S/m) (9).…”

Section: Fdtd Simulationmentioning

confidence: 99%

Low field elliptical MR coil array designed by FDTD

Giovannetti

Hartwig

Viti

et al. 2008

Concepts Magn Reson

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Phased-array in magnetic resonance systems have to be designed minimizing the mutual interaction among nearby coils and this is generally achieved by overlapping adjacent coils. In this paper we describe the use of a numerical solver based on finite-difference time-domain algorithm for determining the overlap distance between two coils that constitute a part of an array system. Using the simulator, we designed a novel array coil composed by two elements with elliptical geometry. The coil was designed for the application in a 0.18 T vertical field MR scanner. A prototype of the designed array was built and tested by laboratory workbench in order to validate the simulated data. Experiments were also done in real low field MR scanner to evaluate the coil performance, which is compared to a standard coil using phantom measurements.

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Section: Fdtd Simulationmentioning

confidence: 99%

Low field elliptical MR coil array designed by FDTD

Giovannetti

Hartwig

Viti

et al. 2008

Concepts Magn Reson

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“…A first-order approximation of eq. (A5), which is satisfactory for the majority of practical cases [6], can be written in the form of scattering matrix equations for an n-wire active line as follows:…”

Section: A Multiport Model For Active Transmission Linesmentioning

confidence: 99%

“…First-order approximations of matrices S 1 (p) and S 2 (p) have been evaluated in [6] and have the following form:…”

Section: A Multiport Model For Active Transmission Linesmentioning

confidence: 99%

Simulation of the coupling of the external electromagnetic field to PCB traces in the SPICE simulator

Bandurski

Dobrza?ski

2004

Int J RF and Microwave Comp Aid Eng

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In this article, a simple method of modeling and simulating electromagnetic field coupling to PCB in the SPICE simulator is presented. The method exploits two assumptions: quasi-TEM wave propagation along PCB traces and representation of an external electromagnetic noise by a plane wave. Under these assumptions, a model of electromagnetic field coupling to the PCB traces is created in the form of an active n-wire transmission line placed in an inhomogeneous (that is, three layers) medium. Next, using the method of successive approximations, an equivalent active n-port (described by means of scattering parameters) is found. This work results in formulas that express the external electromagnetic field in the form of current sources and the way they are simulated in SPICE. The method is illustrated with two examples.

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“…We approximate the parameters , , , , and , by rational functions and use state-space realizations to solve (9) and (11) in the time domain [14]. For this solution, the corresponding expression for the terminal conditions of the line (node in Fig.…”

Section: Time Domain Model For Nulmentioning

confidence: 99%

“…There exists also a multiphase frequency dependent model in Manuscript received June 6, 2001; revised July 5, 2002 which the NUL is subdivided and each subdivision is represented by a lossless uniform line [8]. References [9] and [10] also address the topic of modeling a NUL, assuming however constant line parameters. Most of the methods mentioned before deal with a lossless single-phase line and a particular variation of the line parameters is considered.…”

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confidence: 99%