Full-wave analysis of microstrip floating-line discontinuities (original) (raw)
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Full-wave analysis of radiation effect of microstrip transmission lines
Analog Integrated Circuits and Signal Processing, 1994
A full-wave analysis of radiation effects produced by discontinuities in microstrip and buried microstrip transmission lines is presented. Beginning with the dyadic Green's function for a dielectric slab, with an embedded source, an integral equation is formulated. This equation is then solved by the method of moments to obtain the current distributions along the transmission line, in particular, near the discontinuities. Employing these results, the near-and far-zone fields, as well as radiation patterns are computed. The results from our method showed good agreement with those of previous publications in complex reflection and transmission coefficients, and equivalent capacitance values. It is found that under resonance conditions the radiation efficiency of a simple structure can exceed 41%, which may cause a potential problem in electromagnetic compatibility. Our analytic result also shows that the maximum radiation occurs when the source is located at the height of ko/4fl-~e r from the bottom ground plane, which should be prevented. i i I ~ J J t I J J ~ i I J ~ J i
2008 12th International Conference on Mathematical Methods in Electromagnetic Theory, 2008
The full-wave electrodynamical analysis of the open microwave discontinuities is performed by the space domain integral equation approach. This approach employs the dyadic Green's functions for a grounded multi-layer dielectric configuration and can be used on a single or multi-layer dielectric with or without superstrate. The method of moments is used for numerical solving the received equation. Elements of respective impedance matrix are calculated by combination of analytical and numerical integration. The characteristic network parameters of structure are determined on the know matrix elements.
A Method for Calculating the Frequency-Dependent Properties of Microstrip Discontinuities
IEEE Transactions on Microwave Theory and Techniques, 1977
Afrstract-A method is described for enlcrdating the dynamical (frequency-dependent) properties of varions microstrip discontinuities such as unsymmetrical crossings, T junctions, right-angle bends, impedance steps, and filter elements. The method is applied Ito an unsymmetrical T junction with three different linewidths. Using a wavegnide model with frequency-dependent parameters, a field matching method proposed by Kiihn is employed to compute tlhe scattering matrix of the strictures. The elements of the scattering mntrix calculated in this way differ from those derived from static methods by a bigher frequency dependence, especially for frequencies near tlhe cutoff frequencies of the higher order modes on the microstrip lines. The theoretical results are compared with measurements, and theory and experiment are fonnd to correspond closely.
The spatial Green's function for a rectangular cavity partially filled with multiple layers of lossy dielectrics has been derived. The Green's function is used to compute the fields around a discontinuity in a transmission line. To analyze a discontinuity, the unknown surface current maintained on the microstrip discontinuity is expanded in terms of known suitable basis functions. The electric-field components in the plane of the discontinuity region are then written in terms of this current. Imposing the boundary condition that the component of the electric-field tangential to the metallization is zero yields the electric-field integral equation (EFIE). The method of moments is applied to the EFIE to obtain a system of linear equations. The resultant semianalytical expressions were used to conduct accurate modeling of a variety of structures. The validity and accuracy of this method are established through comparison with other published results. Convergence considerations are outlined and verified.
Analysis of Shielded Lossy Multilayered-Substrate Microstrip Discontinuities
—The spatial Green's function for a rectangular cavity partially filled with multiple layers of lossy dielectrics has been derived. The Green's function is used to compute the fields around a discontinuity in a transmission line. To analyze a discontinuity, the unknown surface current maintained on the microstrip discontinuity is expanded in terms of known suitable basis functions. The electric-field components in the plane of the discontinuity region are then written in terms of this current. Imposing the boundary condition that the component of the electric-field tangential to the metallization is zero yields the electric-field integral equation (EFIE). The method of moments is applied to the EFIE to obtain a system of linear equations. The resultant semianalytical expressions were used to conduct accurate modeling of a variety of structures. The validity and accuracy of this method are established through comparison with other published results. Convergence considerations are outlined and verified.
Microstrip Line Discontinuities Simulation at Microwave Frequencies
Advances in Physics Theories and Applications, 2013
Microwave and Millimeter wave integrated circuits (MICs) have experienced a tremendous growth over the last 50 years. Microstrip line is one of the popular lines in these MICs. Due to the layout necessities, an electromagnetic wave that propagates down a microstrip line may encounter discontinuities such as T-junctions, Bends and vias. A simulation model is presented here for analysing these discontinuities in microstrips through Sonnet Software. The parameters of microstrip lines are determined from the empirical formulae which are based on full wave analysis. The simulation work has been performed on Alumina substrate. The discontinuities are simulated and compensated which gives important results for designing high frequency microwave circuits.
International Journal of Electronics, 1999
This paper presents a general fullwave analysis for the problem of shielded coplanar stripline (CPS) discontinuities. The analysis is based on the electric ® eld space domain integral equation (SDIE) approach. The Green's functions pertinent to the problem are formulated to take into consideration any number of planar strati® ed dielectric layers. The method of moments is applied to numerically solve the SDIE for the unknown current distribution over the CPS conductor surface. Numerical results for CPS open-end, series-gap, CPS resonator, and straight CPS series stubs are presented. Most of the included SDIE results are compared with quasi-transverse electromagnetic results, ® nite di erence time domain results, or complex image technique results
Static analysis of microstrip discontinuities using the excess charge density in the spectral domain
IEEE Transactions on Microwave Theory and Techniques, 1991
Galerkin's method in the spectral domain is applied to solve for the excess charge density existing on the strips of open-end and symmetric gap discontinuities in multilayered anisotropic substrates. The excess charge density is used to determine the capacitance components of the equivalent circuits of these discontinuities. Numerical results are provided and a comparison with previous results existing in the literature is carried out,