Eigen mode solver for microwave transmission lines

Hebermehl, G.; Schlundt, Rainer; Zscheile, H.; Heinrich, W.

doi:10.1108/03321649710172798

Cited by 7 publications

(2 citation statements)

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“…To simulate microstrip structures, we used Ansoft's commercially available electromagnetic simulation software (HFSS) which is a finite element solver. Several software packages have been optimized for microstrip structures, including 6,7 , but HFSS allowed us the ability to easily integrate anisotropic materials without modification of the software. When the dimensions of the microstrip are significantly smaller than the propagation wavelength and on the scale of the skin depth of the conductors, the magnetic and electric fields vary strongly throughout the structure.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Small dimensional microstrips embedded with ferromagnetic layers: Numerical simulations and experimental results

Gollub,

Kuanr,

Celinski

et al. 2008

Preprint

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We use a numerical electromagnetic simulation software to investigate a filtering device consisting of a small dimensional microstrips embedded with a thin layer of ferromagnetic material and we compare our results to experimental results. We are able to show good correlation of simulation versus experiment for the magnitude of insertion loss and phase shift. The microstrips considered have dimensions on the order of the skin depth of the conductor and hence the field distribution is not easily calculated by analytic methods. We show that numerical simulation methods provide an accurate means of characterizing these structures.

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Section: Numerical Simulationsmentioning

confidence: 99%

Small dimensional microstrips embedded with ferromagnetic layers: Numerical simulations and experimental results

Gollub,

Kuanr,

Celinski

et al. 2008

Preprint

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“…The sparse matrix was stored as a dense matrix. Analyzing the lossless case in a previous paper (Hebermehl et al, 1997) the authors presented a method which avoids the computation of all eigenvalues to find the few required propagation constants. The sparse-storage technique is applied.…”

Section: Introductionmentioning

confidence: 99%

On the computation of eigen modes for lossy microwave transmission lines including perfectly matched layer boundary conditions

Hebermehl

Hübner

Schlundt

et al. 2001

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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The design of microwave circuits requires detailed knowledge on the electromagnetic properties of the transmission lines used. This can be obtained by applying Maxwell’s equations to a longitudinally homogeneous waveguide structure, which results in an eigenvalue problem for the propagation constant. Special attention is paid to the so‐called perfectly matched layer boundary conditions (PML). Using the finite integration technique we get an algebraic formulation. The finite volume of the PML introduces additional modes that are not an intrinsic property of the waveguide. In the presence of losses or absorbing boundary conditions the matrix of the eigenvalue problem is complex. A method which avoids the computation of all eigenvalues is presented in an effort to find the few propagating modes one is interested in. This method is an extension of a solver presented by the authors in a previous paper which analyses the lossless case. Using mapping relations between the planes of eigenvalues and propagation constants a strip in the complex plane is determined containing the desired propagation constants and some that correspond to the PML modes. In an additional step the PML modes are eliminated.The numerical effort of the presented method is reduced considerably compared to a full calculation of all eigenvalues.

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