The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
M C Vigano - One of the best experts on this subject based on the ideXlab platform.
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a novel deterministic Synthesis Technique for constrained sparse array design problems
IEEE Transactions on Antennas and Propagation, 2011Co-Authors: Diego Caratelli, M C ViganoAbstract:A novel analytical approach to the Synthesis of linear sparse arrays with non-uniform amplitude excitation is presented and thoroughly discussed in this paper. The proposed Technique, based on the concept of auxiliary array factor, is aimed at the deterministic determination of the optimal array element density and excitation tapering distributions useful to mimic a desired radiation pattern. In particular, the developed antenna placement method does not require any iterative or stochastic optimization procedure, resulting in a dramatic reduction of antenna design times. Selected examples are included in order to assess the effectiveness and versatility of the proposed approach in the framework of aperiodic array Synthesis problems.
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analytical Synthesis Technique for linear uniform amplitude sparse arrays
Radio Science, 2011Co-Authors: Diego Caratelli, M C ViganoAbstract:A novel analytical approach to the Synthesis of linear sparse arrays with uniform?amplitude excitation is presented and thoroughly discussed in this paper. The proposed Technique, based on the auxiliary array factor concept, is aimed at the deterministic determination of the optimal array element density and excitation phase tapering distributions useful to mimic a desired radiation pattern. In particular, the developed antenna placement method does not require any iterative or stochastic optimization procedure, resulting in a dramatic reduction of the antenna design times (typically on the order of a few seconds). Antenna mutual coupling is not taken into account within the developed methodology; hence, to assess the sensitivity of the design procedure to such nonideality, a dedicated numerical investigation has been carried out by using a rigorous full?wave electromagnetic field prediction Technique. The obtained results prove the effectiveness and the versatility of the proposed array Synthesis approach even in operative scenarios where a significant deviation from desired antenna operation is observed.
H.-s. Wu - One of the best experts on this subject based on the ideXlab platform.
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a new low side lobe pattern Synthesis Technique for conformal arrays
IEEE Transactions on Antennas and Propagation, 1993Co-Authors: Yongchang Jiao, L.-w. Huang, H.-s. WuAbstract:The application of the new nonlinear optimization algorithms to array design is demonstrated by the low-side-lobe pattern Synthesis of conformal arrays. By adopting the information of array element realized gain patterns the authors formulate Synthesis problems as nonlinearly constrained optimization problems, and propose a direct method to solve them. The Technique allows them to find a set of array coefficients that yield a pattern meeting a specified side-lobe level and achieving the maximum directivity, if such a set of array coefficients exists. If the side-lobe specifications cannot be met with the given array, the Technique will result in a set of coefficients that yield a pattern meeting the best attainable side-lobe level and having directivity as high as possible. Simplified Synthesis problems for an axial dipole array in an infinite, perfectly conducting cylinder are discussed, and numerical results are given. The Synthesis Technique works for general array patterns. >
Diego Caratelli - One of the best experts on this subject based on the ideXlab platform.
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analytically based extraction of foster like frequency independent antenna equivalent circuits
International Symposium on Electromagnetic Theory, 2013Co-Authors: Diego Caratelli, Nadia Haider, Alexander YarovoyAbstract:An efficient methodology based on the Foster's network Synthesis Technique is developed for the extraction of frequency-independent antenna equivalent circuits from fullwave electromagnetic-analysis-based numerical data.
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a novel deterministic Synthesis Technique for constrained sparse array design problems
IEEE Transactions on Antennas and Propagation, 2011Co-Authors: Diego Caratelli, M C ViganoAbstract:A novel analytical approach to the Synthesis of linear sparse arrays with non-uniform amplitude excitation is presented and thoroughly discussed in this paper. The proposed Technique, based on the concept of auxiliary array factor, is aimed at the deterministic determination of the optimal array element density and excitation tapering distributions useful to mimic a desired radiation pattern. In particular, the developed antenna placement method does not require any iterative or stochastic optimization procedure, resulting in a dramatic reduction of antenna design times. Selected examples are included in order to assess the effectiveness and versatility of the proposed approach in the framework of aperiodic array Synthesis problems.
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analytical Synthesis Technique for linear uniform amplitude sparse arrays
Radio Science, 2011Co-Authors: Diego Caratelli, M C ViganoAbstract:A novel analytical approach to the Synthesis of linear sparse arrays with uniform?amplitude excitation is presented and thoroughly discussed in this paper. The proposed Technique, based on the auxiliary array factor concept, is aimed at the deterministic determination of the optimal array element density and excitation phase tapering distributions useful to mimic a desired radiation pattern. In particular, the developed antenna placement method does not require any iterative or stochastic optimization procedure, resulting in a dramatic reduction of the antenna design times (typically on the order of a few seconds). Antenna mutual coupling is not taken into account within the developed methodology; hence, to assess the sensitivity of the design procedure to such nonideality, a dedicated numerical investigation has been carried out by using a rigorous full?wave electromagnetic field prediction Technique. The obtained results prove the effectiveness and the versatility of the proposed array Synthesis approach even in operative scenarios where a significant deviation from desired antenna operation is observed.
Huanfang Tian - One of the best experts on this subject based on the ideXlab platform.
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scalable self propagating high temperature Synthesis of graphene for supercapacitors with superior power density and cyclic stability
Advanced Materials, 2017Co-Authors: Xiong Zhang, Kai Wang, Xianzhong Sun, Guanghua Liu, Huanfang TianAbstract:An ultrafast self-propagating high-temperature Synthesis Technique offers scalable routes for the fabrication of mesoporous graphene directly from CO2 . Due to the excellent electrical conductivity and high ion-accessible surface area, supercapacitor electrodes based on the obtained graphene exhibit superior energy and power performance. The capacitance retention is higher than 90% after one million charge/discharge cycles.
Yongchang Jiao - One of the best experts on this subject based on the ideXlab platform.
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a new low side lobe pattern Synthesis Technique for conformal arrays
IEEE Transactions on Antennas and Propagation, 1993Co-Authors: Yongchang Jiao, L.-w. Huang, H.-s. WuAbstract:The application of the new nonlinear optimization algorithms to array design is demonstrated by the low-side-lobe pattern Synthesis of conformal arrays. By adopting the information of array element realized gain patterns the authors formulate Synthesis problems as nonlinearly constrained optimization problems, and propose a direct method to solve them. The Technique allows them to find a set of array coefficients that yield a pattern meeting a specified side-lobe level and achieving the maximum directivity, if such a set of array coefficients exists. If the side-lobe specifications cannot be met with the given array, the Technique will result in a set of coefficients that yield a pattern meeting the best attainable side-lobe level and having directivity as high as possible. Simplified Synthesis problems for an axial dipole array in an infinite, perfectly conducting cylinder are discussed, and numerical results are given. The Synthesis Technique works for general array patterns. >
