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This paper introduces a new method of two-dimensional discrete complex images to evaluate the Sommerfeld's integral arising in the problem of a vertical magnetic dipole (VMD) over a Microstrip structure. Contrary to the conventional complex images method, which one has to find a new set of images for each new frequency, it is shown that the 2D images take into account the frequency dependence of Sommerfeld's...
This paper presents an efficient technique for a full-wave analysis of microstrip antennas, circuits and discontinuities. The proposed method solves an electric field integral equation with mixed potentials and includes radiation and surface wave effects. Of paramount relevance is the accurate determination of dyadic Green's functions corresponding to the microstrip flat multilayered substrate. The...
The software EMsim™∗ has a graphical shell and a field theory “engine” WATMIC. This paper discusses the adjustments to the engine to improve the accuracy to 1 % error or less. The only limitation for new WATMIC is that it does not account for surface wave of substrates thicker than 0.05λd (in the substrate).
An improved technique for accurate evaluation of the Sommerfeld integrals appearing in the Gzx component single layer microstrip Green's function is described here that utilizes closed-form evaluation of the infinite tail, and numerical integration of a finite integral. The overall method avoids: (a) any pole calculations, and, (b) the traditional large argument approximation of the Bessel function...
The propagation characteristics of the fundamental mode of annular ring microstrip antenna (ARMSA) on metamaterial substrate are determined via spectral domain analysis. Green's functions of the structure in Hankel transform domain are determined by using Hertz vector formulation. Numerical results of resonant frequencies are found as functions of some geometrical parameters.
In this paper, we study the effects of the uniaxial permittivity anisotropy of the substrate, on the resonant frequency and the bandwidth of a rectangular microstrip antenna of the structure as: substrate; patch; superstrate. The problem is rigorously formulated by using the integral equation based on the dyadic spectral Green's function. To obtain the complex resonant frequency of mode TM01, the...
The spectral-domain approach (SDA) is used to investigate the dispersion characteristics of microstrip lines on anisotropic substrate. The Green's function expression and the spectral integral expression are simplified with differential matrix operator technique and closed-form asymptotic extraction. The influence of tensor elements and different mutual misalignment angle on the microstrip dispersion...
In order to increase computing speed, the MOM algorithm including closed-form spatial domain Green's functions is introduced for geometry of microstrip. Based on loss substrate, spurious radiation and suppression for signal lines are investigated. The results show that radiated power from a signal line with a shielding line is much less than that from a signal line without a shielding line. Therefore,...
The spatial Green's function of the open microstrip structure is usually represented by the time-consuming and computationally inefficient spectral integral. This paper introduces a new closed form Green's function for the open microstrip structure by applying the GGF method. Therefore, the numerical integration of the spectral integral can be avoided entirely, leading to a considerable decrease of...
This paper present a rigorous analysis of rectangular microstrip patch over ground planes with substrates isotropic is presented. The dyadic Greenpsilas functions of the problem are efficiently determined in the vector Fourier transform domain. The integral equation for the unknown patch current and field are solved numerically by applying the Galerkin method of moments. The TM set of modes issued...
This paper presents a periodic structures are of great practical use in many applications in antenna systems, microwave electronics and optics. Efficient modelling techniques rely on the Floquet-Bloch theorem to limit the simulation domain to a single unit cell. Up to now, little has been published about the 1D periodic 3D Greenpsilas function, especially when also considering the presence of a stratified...
An extended spectral-domain immittance approach is used to analyze multiconductor systems on layered bianisotropic substrates. Apart from the losses of the bianisotropic layers, the method takes into account the metallization thickness and losses of both the ground metallization and the multiconductor system, which can consist of conventional or high-T/sub C/ superconductors. It is demonstrated that,...
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