Browsing by Keywords "Antennas"
Now showing items 120 of 61

Accuracy: The Frequently Overlooked Parameter in the Solution of Extremely Large Problems
(2011)We investigate error sources and their effects on the accuracy of solutions of extremely large electromagnetics problems with parallel implementations of the multilevel fast multipole algorithm (MLFMA). Accuracy parameters ... 
Accurate modeling of metamaterials with MLFMA
(2006)Electromagnetic modelling of large metamaterial (MM) structures employing multilevel fast multipole algorithm (MLFMA) is reported. MMs are usually constructed by periodically embedding unit cells, such as splitring ... 
Accurate solutions of scattering problems involving lowcontrast dielectric objects with surface integral equations
(2007)We present the stabilization of the surface integral equations for accurate solutions of scattering problems involving lowcontrast dielectric objects. Unlike volume formulations, conventional surface formulations fail to ... 
Advanced partitioning and communication strategies for the efficient parallelization of the multilevel fast multipole algorithm
(2010)Largescale electromagnetics problems can be solved efficiently with the multilevel fast multipole algorithm (MLFMA) [1], which reduces the complexity of matrixvector multiplications required by iterative solvers from O(N ... 
Analysis of an arbitrary profile reflector antenna having resistivetype surfaceHpolarization case
(2008)A regularizationbased numerical solution is obtained for arbitraryshape conic section profile reflector antenna in 2D, for the Hpolarization case. New point is that the reflector surface is assumed a resistivetype ... 
Analysis of circular reflectors by complex sourcedual series approach
(Institute of Electrical and Electronics Engineers, 1993)In the present paper, two dimensional circular reflector antennas are analyzed by a rigorous analyticalnumerical technique for both E and H polarization cases. The method is used in combination with the complex source ... 
Analysis of Lossy Dielectric Objects with the Multilevel Fast Multipole Algorithm
(2011)Rigorous solutions of electromagnetics problems involving lossy dielectric objects are considered. Problems are formulated with two recently developed formulations, namely, the combinedtangential formulation (CTF) and the ... 
Analysis of the 2D nonconcentric large reflector antennainradome system: Hpolarization case
(2004)2D nonconcentric reflector antennainradome system is analyzed for Hpolarization case. Rigorous formulation is performed depending on the MoR, Green's function and CSP methods. Larger geometries are solved in reasonable ... 
Analysis of the nonconcentric radomeenclosed cylindrical reflector antenna system, epolarization case
(Taylor & Francis, 2005)Twodimensional (2D) radiation of a directive complex line source is analyzed in the presence of a perfectly conducting (PEC) reflector antenna system and nonconcentrically located dielectric radome. Similar problem was ... 
Asymptotic wavelike modeling of dielectric lenses
(2007)We propose asymptotic wavelike approximations for the accurate modeling of dielectric lenses used in quasioptical systems of millimeter, submillimeter, and infrared wave applications. For the comparison, we obtain an ... 
Benchmark Solutions of Large Problems for Evaluating Accuracy and Efficiency of Electromagnetics Solvers
(2011)We present a set of benchmark problems involving conducting spheres and their solutions using a parallel implementation of the multilevel fast multipole algorithm (MLFMA). Accuracy of the implementation is tested by comparing ... 
Chiral metamaterials: From negative index to asymmetric transmission
(2013)Chiral metamaterials are attractive for their intriguing properties such as negative refractive index, optical activity and circular dichroism, and asymmetric transmission. In this paper, we review the research we have ... 
Choices of expansion and testing functions for the method of moments applied to a class of electromagnetic problems
(IEEE, 199303)It is well known that the choice of expansion and testing functions plays an important role in determining the rate of convergence of the integrals associated with the moment method matrix, and that an improper choice ... 
Closedform green's function representations for mutual coupling calculations between apertures on a perfect electric conductor circular cylinder covered with dielectric layers
(IEEE, 20110607)Closedform Green's function (CFGF) representations are developed for tangential magnetic current sources to calculate the mutual coupling between apertures on perfectly conducting circular cylinders covered with dielectric ... 
Computational analysis of complicated metamaterial structures using MLFMA and nested preconditioners
(2007)We consider accurate solution of scattering problems involving complicated metamaterial (MM) structures consisting of thin wires and splitring resonators. The scattering problems are formulated by the electricfield ... 
Cooperative transmission for multiuser MIMO systems
(2008)In this work, we investigate the problem of jointly determining the optimal transmission scheme at the base stations in a cooperative multiuser multiple antenna system. In this optimization problem, different than majority ... 
Design and analysis of slotted sectoral waveguide array antennas embedded in cylindrically stratified media
(Institute of Electrical and Electronics Engineers Inc., 2014)Slotted waveguide antennas are being widely used in military and commercial applications for many decades. Low crosspolarization, high power capacity, ease of fabrication in microwave bands, and the ability to form arrays ... 
Development of microstructured metamaterials for innovative antenna layouts
(2007)In this paper, we present the joint activities developed in the frame of the FP6 European Network of Excellence METAMORPHOSE in the field of new microstructured materials for antenna applications. One of the key scientific ... 
Digital microfluidics for reconfigurable antennas
(Institute of Electrical and Electronics Engineers Inc., 2014)Usage of fluids (microfluidic or otherwise) in antennas provides a conceptually easy reconfiguration mechanism in the aspect of physical alteration. However, a requirement of pumps, valves, etc. for liquid transportation ... 
Downlink beamforming under individual SINR and per antenna power constraints
(2007)In this paper we consider the problem of finding the optimum beamforming vectors for the downlink of a multiuser system, where there are individual signal to interference plus noise ratio (SINR) targets for each user. ...