Browsing by Subject "Planarly layered media"
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Item Open Access Efficient methods for electromagnetic characterization of 2-D geometries in stratified media(1997) Çalışkan, FatmaNumerically efficient method of moments (MoM) algorithms are developed for and applied to 2-D geometries in multilayer media. These are, namely, the spatial-domain MoM in conjunction with the closed-from Green's functions, the spectral-domain MoM using the generalized pencil of functions (GPOF) algorithm and a FFT algorithm to evaluate the MoM matrix entries. These approaches are mainly to improve the computational efficiency of the evaluation of the MoM matrix entries. Among these, the spectral-domain MoM using the GPOF algorithm is the most efficient approach for printed multilayer geometries. The assessment of the efficiency of this method is performed on several problems, by comparing the matrix fill times for these three approaches. In addition a new iterative algorithm is developed to solve the MoM matrix equation, which is based on dividing a large object into subregions and solving the matrix equation on each subregion by considering the effects of other regions. This iterative algorithm is applied to some large geometries and is compared to a traditional LU decomposition algorithm for the assessment of its numerical efficiency. It is observed that the iterative algorithm is numerically more efficient as compared to the LU decomposition.Item Open Access Efficient use of closed-form Green's functions for the analysis of planar geometries with vertical connections(Institute of Electrical and Electronics Engineers, 1997-05) Kınayman, N.; Aksun, M. I.An efficient and rigorous method for the analysis of planarly layered geometries with vertical metallizations is presented. The method is based on the use of the closed-form spatial-domain Green's functions in conjunction with the method of moments (MoM). It has already been demonstrated that the introduction of the closed-form Green's functions into the MoM formulation results in significant computational improvement for the analysis of planar geometries. However, in cases of vertical metallizations, such as shorting pin's, via holes, etc., there are some difficulties in incorporating the closed-form Green's functions into the MoM formulation. In this paper, these difficulties are discussed and their remedies are proposed. The proposed approach is compared to traditional approaches from a theoretical point of view, and the numerical implementation is demonstrated through some examples. The results are also compared to those obtained from the commercial software em by SONNET.Item Open Access A novel CAD algorithm for the analysis of printed geometries(1997) Kınayman, NoyanAn efficient and accurate computer aided design (CAD) software for the electromagnetic simulation of passive microwave components, fabricated in planar stratified media, is developed in this work. The numerical technique employed in this software is based on the spatial-domain method of moments (MoM) in conjunction with the closed-form Green’s functions. Since the computational efficiency is a major issue in CAD softwares, the spatial-domain MoM is significantly improved in this respect with the use of the closed-form Green’s functions and closed-form expressions for the MoM matrix entries. Vertical metalizations in the form of via holes and shorting pins, which are the indispensable parts of the most microwave circuits, are also modeled very efficiently and incorporated into this formulation. The resulting approach is applied to some realistic microwave circuits and planar antennas, with and without vertical metalizations, to validate the formulation. It is also demonstrated that the formulation developed in this work can be efficiently used with an optimization algorithm for design purposes. The results obtained from the formulation proposed in this work are compared to those obtained from a commercial electromagnetic analysis software.