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The use of atomic function for inner problem solution for wire antennas

The use of atomic function for inner problem solution for wi...

引用

International Conference on Antenna Theory and Techniques

作者： Y.Y. Bobkob Byelorussian State Univ. of Inf. & Radioelectronics Minsk Belarus

The comparison of computing efficiency of primary atomic functions Up (x) and piecewise sinusoidal functions for the inner problem solution of wire problem, used as the basis function, was executed. The ways to increa... 详细信息

关键词： Wire Equations Impedance Image segmentation Antenna feeds message-oriented middleware Convergence Antenna accessories Atomic measurements Current distribution

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A new approach to the use of complex images method in the evaluation of MoM matrix entries

A new approach to the use of complex images method in the ev...

引用

Antennas and Propagation Society International Symposium

作者： L. Alatan Electrical & Electronics Engineering Department Middle East Technical University Ankara Turkey

The spatial domain MoM matrix entries are expressed in closed-form by approximating both the spectral domain Green's function and the spectral domain representation of the correlation of basis and testing function... 详细信息

关键词： message-oriented middleware Transmission line matrix methods Testing Geometry Integral equations Computer integrated manufacturing Algorithm design and analysis Microstrip Moment methods Nonhomogeneous media

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Analysis of RF-MEMS switches using finite element-boundary integration with moment method

Analysis of RF-MEMS switches using finite element-boundary i...

引用

Antennas and Propagation Society International Symposium

作者： Z. Wang B. Jensen J. Volakis K. Saitou K. Kurabayashi University of Michigan Ann Arbor USA University of Michigan Ann Arbor MI US Michigan Univ. Ann Arbor MI USA

This paper presents a new hybrid methodology for modeling RF-MEMS switches. This method combines the usual finite element-boundary integration (FE-BI) method for the fixed section of the switch, and the method of moments for the movable beam. This approach is intended to address the large 100:1 scale variation within a single computational domain, which also spans a very small fraction of a wavelength.

关键词： Radiofrequency microelectromechanical systems Switches Finite element methods Moment methods message-oriented middleware Bismuth Electromagnetic modeling Finite difference methods Time domain analysis Microswitches

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Novel calculation rule in multipole algorithm

Novel calculation rule in multipole algorithm

引用

IEEE Topical Conference on Wireless Communication Technology

作者： T. Yamamoto S. Ohnuki W.C. Chew Department of Electrical and Electronic Engineering Yamagata University Yonezawa Yamagata Japan Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign

ISBN: (纸本)0780381962

The fast multipole algorithm (FMA) and the multilevel fast multipole algorithm (MLFMA) are ways to expedite matrix-vector multiplication in the CG method and are researched widely as a calculation method in electromagnetic scattering analysis. In a simple 2D MoM case, the Green's operator is factorized using Bessel and Hankel functions with the assistance of the addition theorem as the non-diagonal form, and this expression can be rewritten in the Fourier space as the diagonal form. Even though the Hankel function series has the divergence property, the summation of the non-diagonal form converges because the Bessel function diminishes more rapidly. On the other hand, the diagonal form diverges for a large truncation number. Even if the most optimum truncation number is selected in the diagonal form, the error does not become extremely small, especially in the small buffer case. This paper proposes a novel calculation rule that uses two equations, the diagonal form and the non-diagonal. By switching between these two expressions, the error coming from the nearest neighbor interactions can be suitably suppressed to the smaller level and the calculation can be realized with high precision accuracy. Not only minimizing the error but also realizing the required error level is also possible in this new rule. The relations between several parameters, such as truncation number, buffer number and box size, are demonstrated.

关键词： Bandwidth MLFMA Convergence Computational electromagnetics Laboratories Character generation Electromagnetic scattering Electromagnetic analysis Algorithm design and analysis message-oriented middleware

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Metamaterials composed of fractal sphere molecules

Metamaterials composed of fractal sphere molecules

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Antennas and Propagation Society International Symposium

作者： M.J. Facchine D.H. Werner Department of Electrical Engineering Pennsylvania State University University Park PA USA

ISBN: (纸本)0780378466;0852967527

The properties of artificial dielectric metamaterials depend primarily on the type of inclusions or "molecules" considered as well as their distribution in a host medium. Some common types of molecule geometries that were considered in the past for artificial dielectric materials include simple dipoles and spheres. We consider a fractal sphere approach combining aspects of both the dipole and sphere resulting in an inclusion with a greater number of resonances and resonant behavior at lower frequencies than either their dipole or sphere counterparts of the same size. The results of this investigation suggest that the fractal sphere molecules allow us to push the lower frequency band and, in some instances, also provide multiband response.

关键词： Fractals Resonance Frequency Solids Dielectric materials Backscatter message-oriented middleware Geometry Electromagnetic waveguides Electromagnetic wave polarization

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On the issue of increasing the capacity of digital surface microwave channel with multiposition phase keying

On the issue of increasing the capacity of digital surface m...

引用

International Crimean Conference on Microwave & Telecommunication Technology

作者： I.B. Shirokov S.A. Shaban D. Sinitsyn S.N. Polivkin T.N. Narytnik Севастопольский Национальный технический университет Севастополь Стрелецкая бухта СевНТУ ИЭС УАННП Киев

The issue of the amplitude and phase fluctuations influence over line-of-sight links on the microwave propagation is discussed. Recommendations on increasing the capacity of the LOS digital microwave channel with mult... 详细信息

关键词： Fluctuations message-oriented middleware Fading Microwave measurements Phase measurement Organizing IEEE catalog Indium tin oxide Turbo codes Modulation coding

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Design and On-Wafer Measurement of a W-Band Via-Less CPW RF Probe Pad to Microstrip Transition

Design and On-Wafer Measurement of a W-Band Via-Less CPW RF ...

引用

European Conference on Microwave

作者： G. Zheng P. Kirby A. Rodriguez J. Papapolymerou M. Tentzeris L. Dunleavy School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Department of Electrical Engineering University of South Florida Tampa FL USA

A very wide band via-less coplanar waveguide RF probe pad to microstrip transition is presented. The simulation with Agilent's Momentum (MOM) shows that a 3 dB bandwidth of 173% can be achieved from 10GHz to 110GHz with an average loss of 0.4dB, and 0.2dB at 70GHz. The fabrication was done on 100μm thick high resistivity silicon wafer, and two measurement methods were used to obtain the s-parameters of the transition. Measured results show that the insertion loss has an average value of 0.4dB from 40GHz to 100GHz, with the return loss better than 13dB.

关键词： Coplanar waveguides Radio frequency Probes Microstrip Wideband Waveguide transitions message-oriented middleware Bandwidth Fabrication Conductivity

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A concurrent periodic/non-periodic technique for large phased arrays

A concurrent periodic/non-periodic technique for large phase...

引用

Antennas and Propagation Society International Symposium

作者： K.Y. Sze K.F. Sabet D. Chun EMAG Technologies Inc. Ann Arbor MI USA Emag Technologies Inc Ann Arbor MI US EMAG Technol. Inc Ann Arbor MI USA

In this paper, a brief overview of a proposed simple concurrent periodic/nonperiodic analysis scheme, the decompose-solve-recompose (DSR) technique, is presented for the modeling of planar large phased array (LPA) systems. The resulting 2D spatial DSR technique, known as the hybrid edge-periodic DSR technique, requires the decomposition of a large planar array into an outer edge "ring" array and a central periodic array block. Since computational cost is a very important criterion in the analysis and design of an LPA, a cost function analysis example is presented.

关键词： Phased arrays Planar arrays message-oriented middleware Predictive models Geometry Computational efficiency Cost function Moment methods Matrix decomposition Mutual coupling

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Convergence rates of 2D moment method solutions for the MFIE and EFIE

Convergence rates of 2D moment method solutions for the MFIE...

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Antennas and Propagation Society International Symposium

作者： C.P. Davis K.F. Warnick Department of Electrical and Computer Engineering Brigham Young University Provo UT USA Department of Electrical and Computer Engineering Brigham Young University Provo UT

We give theoretical convergence rates for the surface current and backscattering amplitude from an infinite, PEC circular cylinder associated with typical moment method solutions to the magnetic and electric field int... 详细信息

关键词： Moment methods Scattering Engine cylinders Integral equations message-oriented middleware Amplitude estimation Testing Backscatter Eigenvalues and eigenfunctions Geometry

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Microstrip filter analysis using a set of full-domain basis functions

Microstrip filter analysis using a set of full-domain basis ...

引用

SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： O.M.C.P. Filho L.C. da Silva R. Rodriguez Dept. Engenharia Eletrônica Universidade Federal de Minas Gerais Brazil Centro de Estudos em Telecomunicações Pontificia Universidade Católica do Rio de Janeiro Brazil Departamento Electrónica y Electromagnetismo Universidad de Sevilla Spain

This paper presents the formulation and results for microstrip filter analysis through the method of moments using full-domain basis functions at both the input and output ports, and at the resonators. Examples and co... 详细信息

关键词： Microstrip filters Resonator filters Microstrip resonators Moment methods Flexible printed circuits Dielectric losses Transmission lines Green's function methods Telecommunications message-oriented middleware

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