Transient analysis of microstrip lines with ferrite substrate by extended FD-TD method

Zheng, Guowu; Chen, Kangsheng

doi:10.1007/bf01009054

Cited by 14 publications

(6 citation statements)

References 7 publications

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“…Earlier FDTD algorithms for ferrites are described in [1], [203]- [211] based on either a frequency-dependent (Polder) tensor as above or on the Gilbert's equation of motion, describing the interaction between the magnetic intensity and the magnetization . An improved FDTD algorithm for ferrite based on the Gilbert's equation of motion and space synchronism is discussed in [212].…”

Section: Combined Effectsmentioning

confidence: 99%

Time-Domain Finite-Difference and Finite-Element Methods for Maxwell Equations in Complex Media

Teixeira

2008

IEEE Trans. Antennas Propagat.

202

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Section: Combined Effectsmentioning

confidence: 99%

Time-Domain Finite-Difference and Finite-Element Methods for Maxwell Equations in Complex Media

Teixeira

2008

IEEE Trans. Antennas Propagat.

202

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“…Thus, the algorithm proceeds as follows: first, compute from (3)-(5); second, compute from (14)- (16); and finally compute using the difference equations resulting from discretizing (2) [7]. To solve the above difference equations, a value for has to be selected first as an input parameter.…”

Section: Assumingmentioning

confidence: 99%

Dispersion analysis of multilayer cylindrical transmission lines containing magnetized ferrite substrates

Dib¹,

Omar

2002

IEEE Trans. Microwave Theory Techn.

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Recently, there has been a growing interest in using cylindrical transmission lines that contain magnetized ferrite material in a variety of applications. In this paper, the finite-difference time-domain (FDTD) method (in cylindrical coordinates) and the spectral-domain analysis (SDA) are used to calculate the propagation characteristics of cylindrical transmission lines that contain magnetized ferrite material. The magnetization can be either in the longitudinal or azimuthal directions. Specifically, the cylindrical microstrip line, and the cylindrical coplanar waveguide printed on magnetized ferrite substrate are analyzed. Both the FDTD and SDA results are in very good agreement. In addition, the results are compared to those of planar structures by taking the radius of the substrate to be large enough such that the curvature effect is negligible. Index Terms-Circular waveguide, coplanar waveguide, FDTD methods, ferrite loaded waveguides, microstrip, spectral-domain analysis. I. INTRODUCTION T HERE IS A growing interest in antennas that are printed on cylindrical substrates. These antennas may find applications in aircraft, missiles, and wireless communications due to their features of conformability, light weight, small size, and the geometrical compatibility to the vehicle they are mounted on. The use of ferrite substrates also adds more flexibility to the design of cylindrical antennas due to the effect of the applied dc magnetic field on the performance of the antenna. Ferrite materials are widely used in microwave applications, such as isolators, circulators, and phase shifters. Recently, there has been an increasing interest in studying cylindrical structures (circular waveguide and cylindrical microstrip antennas) containing magnetized ferrite media [1]-[6]. Specifically, the effects of anisotropy of ferrite coating on the radiation characteristics of cylindrical structures excited by elementary electric or magnetic dipoles have been investigated in [1]-[3]. The main advantage of a ferrite substrate is that the electrical parameters can be controlled by an externally applied magnetic field. Recently, the finite-difference time-domain (FDTD) technique has been extended to study the dispersion characteristics Manuscript received March 25, 2001.

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“…Thus, the DI schemes presented to date have accomplished the task of simulating electromagnetic effects within magnetic materials but have introduced certain errors in their chosen approximations. For example, Zheng and Chen [2] make the assumption that H n H n01=2 to update magnetization. This assumption leads to a quite simple implementation, but introduces significant inaccuracies in the resulting scheme.…”

Section: Introductionmentioning

confidence: 99%

“…This method begins with the basic Maxwell equations, but leaves Faraday's law dependent on B rather than expressing the solution in terms of H as commonly done. These equations are combined with the Landau-Lifschitz form Manuscript (1) @Bac @t = 0 r 2 E ac (2) where currents are neglected, the electric constitutive relation (D = r E) was used, and the subscript ac is used to indicate that only time-varying fields are considered here. In addition to the curl equations above, the magnetic constitutive relation must be considered H ac = 1 B ac 0 M ac : …”

Section: Introductionmentioning

confidence: 99%

A Second-Order Accurate Time-Stepping Algorithm for Dominant Mode Propagation in Ferrite Media

Adams

Lai

2012

IEEE Trans. Antennas Propagat.

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This communication presents a fully second-order accurate time-domain simulation scheme that incorporates magnetic materials operating in the dominant mode. The proposed scheme is a modification of the Yee scheme by incorporating the Landau-Lifschitz equation of motion including the dominant and loss terms. Additionally, a rigorous dispersion analysis is presented for the proposed scheme. It is demonstrated that the proposed scheme has no numerical losses (when the phenomenological loss term is set to zero), and the pertinent resonant frequencies experience a second-order shift as a consequence of the numerical discretization.

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Transient analysis of microstrip lines with ferrite substrate by extended FD-TD method

Cited by 14 publications

References 7 publications

Time-Domain Finite-Difference and Finite-Element Methods for Maxwell Equations in Complex Media

Time-Domain Finite-Difference and Finite-Element Methods for Maxwell Equations in Complex Media

Dispersion analysis of multilayer cylindrical transmission lines containing magnetized ferrite substrates

A Second-Order Accurate Time-Stepping Algorithm for Dominant Mode Propagation in Ferrite Media

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