Anoriginal theoretical approach for antenna optimization and designisintroduced in this paper. Thismethod consistsof coupling between the FDTD method applied to the study of microstrip patch antennas and the gene...
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作者：
ch. melonTh. monediereF. JeckoI.R.C.O.M.
U.R.A. au C.N.R.S. No. 356 Equipe “Electromagnétisme” Faculté des Sciences 123 Avenue Albert Thomas 87060 Limoges Cedex France
Ferrites, which are used inmany microwave devices ascirculatorsorisolators, have complex geometries. Whensubjected to a magnetic field ferrites exhibit anisotropic and dispersive permeability. if thismagnetic fi...
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The FDTD method is applied for the theoretical analysisof a new pulse-forming optoelectronic device. Because of a capacitive structure, a photoconductive pulse characterized by a fast rise and a long tail, is derived...
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in this article we describe the design and rest of low-cost millimeter-wave omnidirectional antenna formobile communication links. The desired radiated pattern will cover -17 to 53 degreesin the elevation plane. A m...
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in this article we describe the design and rest of low-cost millimeter-wave omnidirectional antenna formobile communication links. The desired radiated pattern will cover -17 to 53 degreesin the elevation plane. A mono.ole antenna on the conical ground plane isconsidered, and theoretical and experimental results are presented. (c) 1997 John Wiley & sons, inc.
Anoriginal theoretical approach for antenna optimization and designisintroduced in this paper. Thismethod consistsof coupling between the FDTD method applied to the study of microstrip patch antennas and the gene...
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Anoriginal theoretical approach for antenna optimization and designisintroduced in this paper. Thismethod consistsof coupling between the FDTD method applied to the study of microstrip patch antennas and the genetic algorithm (GA) as anoptimization tool. A neural network allows the computing time to be deceased by acting as a database, thus avoiding multiple calls to the FDTD code. The principle of this approach isillustrated. (c) 1997 John Wiley & sons, inc.
The FDTD method is applied for the theoretical analysisof a new pulse-forming optoelectronic device. Because of a capacitive structure a photoconductive pulse characterized by a fast rise and a long tail, is derived ...
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The FDTD method is applied for the theoretical analysisof a new pulse-forming optoelectronic device. Because of a capacitive structure a photoconductive pulse characterized by a fast rise and a long tail, is derived and provides anultrashort electrical pulse. (c) 1997 John Wiley & sons, inc.
The purpose of thiscommunicationis tocompare real and power far field patternssynthesis arrays. The synthesised patternis anoptimum approximation to the prescribed power patternin a minmax sense. A comparison b...
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The purpose of thiscommunicationis tocompare real and power far field patternssynthesis arrays. The synthesised patternis anoptimum approximation to the prescribed power patternin a minmax sense. A comparison betweenreal and power formulationsisrealised forshaped (cosecante) and pencil beams.
The purpose of thiscommunicationis to discuss the effect of the mutual coupling between element arrayson the radiation pattern, and tocompensate for this effect inintroducing theminto a power far-field patterns...
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The purpose of thiscommunicationis to discuss the effect of the mutual coupling between element arrayson the radiation pattern, and tocompensate for this effect inintroducing theminto a power far-field patternsynthesis array. The synthesized patternis anoptimum approximation to the prescribed power patternin the minmax sense. A study isrealized forshaped sectarian and cosecant beams. (c) 1996 John Wiley & sons, inc.
in this paper, anoptoelectronicsampleris described. The device ismade with microstrip propagation lines and ultra-rapid photoconductive switches which are integrated in the same substrate. The samplerisused tom...
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Active filterstructures are proposed using a low-frequency transversal and recursive approach. separate studiesof the different functional blocks lead to the designof no.tunable and tunable original structures for ...
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Active filterstructures are proposed using a low-frequency transversal and recursive approach. separate studiesof the different functional blocks lead to the designof no.tunable and tunable original structures for which we present both simulated and measured resultsinmmic techno.ogy. We also validate a new stability analysismethod developed in [1], by comparing the no.malized determinant function to the classical recursive approach. (c) 1995 John Wiley & sons, inc.
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