ELEDIA Student Project Activities and Theses Reports: No conditions. Results ordered -Date Deposited. 2018-07-16T08:30:35ZEPrintshttp://eledia.science.unitn.it/images/eledialogo.pnghttp://eledia.science.unitn.it/publications/7212012018-07-06T07:31:18Z2018-07-06T07:31:18Zhttp://eledia.science.unitn.it/publications/id/eprint/776This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7762018-07-06T07:31:18ZA QCTO-SI Approach for the Synthesis of Miniaturized Linear Conformal ArraysThis work presents a novel material-by-design (MbD) technique aimed at synthesizing conformal and miniaturized linear arrays. A two-step quasi-conformal transformation (QCTO) approach is exploited in order to synthesize meta-material coverings of the conformal arrangements in order to restore their reference free-space radiation features. Moreover, a source inversion (SI) strategy is applied in order to reduce the number of radiators, by synthesizing a new set of excitations of the final conformal architecture. Some numerical results are presented in order to assess the effectiveness as well as the current limitations of the proposed MbD synthesis methodology.M. SalucciG. OliveriN. AnselmiA. Massa2018-06-29T07:18:58Z2018-06-29T07:18:58Zhttp://eledia.science.unitn.it/publications/id/eprint/775This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7752018-06-29T07:18:58ZConformal Miniaturization of Linear Arrays through a Two‐Step Material‐by‐Design ApproachIn this work, a novel Material-by-Design (MbD) synthesis approach is proposed to address the conformal miniaturization of linear antenna arrays. The developed methodology exploits as a first step a quasi-conformal transformation optics (QCTO) algorithm to design a meta-material radome able to restore the desired radiation features of the radiating system once it has been made conformal to an arbitrary surface. Moreover, a second step based on a source inversion (SI) strategy is exploited in order to miniaturize the conformal architecture, by reducing the number of required radiators in the final conformal arrangement. Some numerical results are shown based on full-wave analyses in order to validate the effectiveness, as well as the current limitations, of the proposed design technique.M. SalucciG. OliveriN. AnselmiA. Massa2018-06-22T08:58:48Z2018-06-22T08:58:48Zhttp://eledia.science.unitn.it/publications/id/eprint/774This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7742018-06-22T08:58:48ZOn the Design of Spline‐Based Lenses for the Conformal Miniaturization of Linear Antenna ArraysThis work deals with the conformal miniaturization of linear antenna arrays. Towards this end, a novel synthesis approach based on the Material-by-Design (MbD) paradigm is proposed. The presented methodology exploits the integration of a two-step quasi-conformal transformation optics (QCTO) approach with a source inversion (SI) strategy. One the one hand, the purpose of the QCTO is to synthesize a meta-material covering that is able to restore the radiation features of the radiating system once its geometry has been matched to an arbitrary conformal profile. On the other hand, the SI allows to reduce the number of required radiators in the final conformal geometry without introducing visible alterations to the desired radiation features. Some numerical results are shown in order to validate the proposed MbD synthesis approach for the design of meta-material lenses based on spline curves.M. SalucciG. OliveriN. AnselmiA. Massa2018-06-15T07:58:01Z2018-06-15T07:58:01Zhttp://eledia.science.unitn.it/publications/id/eprint/773This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7732018-06-15T07:58:01ZA Comparative Assessment of Different Lens Geometries for the Material‐by‐Design Synthesis of Conformal ArraysIn this work, the conformal transformation of linear antenna arrays is dealt with. An innovative Material-by-Design (MbD) approach is proposed in order to match a user-defined reference array onto an arbitrary conformal hosting surface without changing its radiating features. Towards this end, a two-step quasi-conformal transformation optics (QCTO) methodology is suitably customized and applied to synthesize a meta-material covering of the conformal geometry able to restore the desired radiation characteristics. A comparative assessment between several choices of the lens geometry is given by means of numerical full-wave simulations.M. SalucciG. OliveriN. AnselmiA. Massa2018-06-08T09:02:58Z2018-06-08T09:02:58Zhttp://eledia.science.unitn.it/publications/id/eprint/772This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7722018-06-08T09:02:58ZLens Thickness Impact on the Performance of Conformal Miniaturized Arrays Designed through a Material‐by‐Design Approach This work deals with the conformal miniaturization of linear antenna arrays. A novel design methodology based on the Material-by-Design (MbD) paradigm is proposed. More precisely, the presented approach exploits a two-step quasi-conformal transformation optics (QCTO) algorithm in order to match linear arrays onto arbitrary surfaces. The synthesized meta-material lens, covering the conformal array, ensures that its radiation features are kept as much as possible equal to those of the reference antenna in free-space. Moreover, a source inversion (SI) strategy is adopted in order to achieve a reduction of the radiators in the final conformal arrangement. A study of the impact of the lens thickness on the achievable performance is presented, making use of full-wave simulations in order to carefully analyze the electromagnetic behavior of the synthesized radiating architectures. M. SalucciG. OliveriN. AnselmiA. Massa2018-06-01T06:05:53Z2018-06-01T06:05:53Zhttp://eledia.science.unitn.it/publications/id/eprint/771This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7712018-06-01T06:05:53ZConformal Transformation of Linear Antenna Arrays through Transformation OpticsIn this work, an innovative Material-by-Design (MbD) methodology is proposed to address the conformal transformation of linear antenna arrays. A two-step quasi-conformal transformation optics (QCTO) is exploited in order to match the antenna onto arbitrary curved surfaces. Some preliminary numerical results are shown, obtained by means of full-wave simulations of the MbD-synthesized conformal radiating systems, in order to assess the effectiveness of the developed synthesis methodology.M. SalucciG. OliveriN. AnselmiA. Massa2018-05-10T07:18:53Z2018-05-10T07:18:53Zhttp://eledia.science.unitn.it/publications/id/eprint/770This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7702018-05-10T07:18:53ZADS‐Guided Design of Planar Thinned Phased Arrays Through Genetic OptimizationThis work presents an innovative hybrid approach for synthesizing thinned planar phased arrays. The a-priori information provided by analytical almost difference sets (ADSs) is profitably exploited by a customized stochastic optimization approach based on genetic algorithms (GAs). Such an ADSGA approach is able to overcome the current limitations of state-of-the-art techniques based on ADSs. Some numerical results are shown in order to assess the potentialities, as well as the limitations, of the proposed design methodology.M. SalucciG. GottardiN. AnselmiG. Oliveri2018-05-04T07:52:24Z2018-05-04T07:52:24Zhttp://eledia.science.unitn.it/publications/id/eprint/769This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7692018-05-04T07:52:24ZAn Innovative Approach for the Design of Thinned 2D Arrays Based on Evolutionary Optimization and Almost Difference SetsIn this work, a novel approach for the design of 2D thinned phased arrays is proposed. The developed strategy is able to exploit the efficiency of analytical almost difference sets (ADSs) and the effectiveness of evolutionary optimization in exploring the search space of all possible solutions. Towards this end, a binary optimization technique inspired by the genetic algorithm (GA) is properly customized by adapting its basic operators in order to exploit the a-priori information provided by the ADS sequences. Some numerical results are shown in order to assess the proposed ADSGA technique for thinning planar arrays, as well as to directly compare it to state-of-the-art solutions. M. SalucciG. GottardiN. AnselmiG. Oliveri2018-04-27T08:47:20Z2018-04-27T08:47:20Zhttp://eledia.science.unitn.it/publications/id/eprint/768This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7682018-04-27T08:47:20ZThinning Planar Phased Arrays by Means of Hybrid Analytical‐Evolutionary OptimizationThis work deals with the design of planar thinned phased arrays. An innovative 2D hybrid thinning procedure is proposed to combine the efficiency of analytical almost difference sets (ADSs) with the effectiveness of genetic algorithms (GAs) to enable faster convergence rates and improved side-lobe suppression with respect to classical thinning strategies. The performance of the proposed ADSGA method are carefully assessed by means of selected numerical results. Moreover, a comparison with competitive state-of-the-art approaches addressing the same design problem is shown, as well.M. SalucciG. GottardiN. AnselmiG. Oliveri2018-04-20T07:27:35Z2018-04-20T07:27:35Zhttp://eledia.science.unitn.it/publications/id/eprint/767This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7672018-04-20T07:27:35ZA Novel Approach for the Design of Planar Thinned Arrays Based on Genetic Algorithms and Almost Difference Sets This work presents a novel hybrid procedure that is able to combine the efficiency of analytical almost difference sets (ADSs) designs and the effectiveness of genetic algorithm (GA)-based search strategies for the design of thinned planar arrays. The proposed approach is able to overcome the current limitations of state-of-the-art analytical thinning methods for planar apertures.
Some numerical examples will be shown in order to verify the features and the potentialities of the proposed ADSGA design technique.
M. SalucciG. GottardiN. AnselmiG. Oliveri2018-04-13T07:14:30Z2018-04-13T07:14:30Zhttp://eledia.science.unitn.it/publications/id/eprint/766This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7662018-04-13T07:14:30ZSynthesis of Planar Thinned Arrays by Means of an Innovative Analytical‐Stochastic ApproachIn this work, an innovative approach is proposed to design planar thinned phased arrays. The proposed methodology exploits the integration of analytical strategies and a global optimization technique in order to solve the limitations of current almost difference sets (ADSs)-based methods. Towards this end, a customization of the optimization operators is performed in order to exploit the a-priori information provided by ADS sequences and guide the optimization performed by a Genetic Algorithm (GA). Some numerical results are shown in order to validate the proposed ADSGA approach for the thinning of planar arrays.M. SalucciG. GottardiN. AnselmiG. Oliveri2018-02-16T10:40:25Z2018-02-26T15:58:54Zhttp://eledia.science.unitn.it/publications/id/eprint/764This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7642018-02-16T10:40:25ZAn Innovative Material-by-Design Method for the Enhancement of Linear Active Electronically-Scanned ArraysThe problem of enhancing the radiation features (in terms of directivity and side-lobe level) of an existing linear active electronically-scanned array (AESA) is addressed. A novel material-by-design (MbD) design technique is proposed to synthesize suitably engineered meta-material lenses able to significantly improve the performance of the covered antenna array without increasing the number of elementary radiators nor re-designing the feeding network. Moreover, the synthesized architectures are able to mimic the radiation characteristics of larger apertures without requiring highly-anisotropic meta-materials thanks to the exploitation of a customized quasi-conformal transformation optics (QCTO) technique in combination with a source inversion (SI) strategy. Some numerical results are presented and discussed in order to verify the potentialities of the proposed synthesis technique.M. SalucciG. OliveriN. AnselmiG. GottardiA. Massa2018-02-09T13:42:40Z2018-02-26T14:50:58Zhttp://eledia.science.unitn.it/publications/id/eprint/762This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7622018-02-09T13:42:40ZQuasi-Conformal Transformation Optics as Applied to Linear Antenna Array Performance EnhancementThis work presents an innovative Material-by-Design (MbD) technique aimed at improving the radiation features of existing linear active electronically-scanned arrays (AESAs). Such a performance enhancement (in terms of beam-width, directivity, and side-lobe level) is guaranteed without increasing the number of elements nor requiring the re-design of the radiators and/or feeding network. Thanks to a suitable customization and integration of the quasi-conformal transformation optics (QCTO) technique approach with a source inversion (SI) strategy, the developed methodology enables the synthesis of meta-material enhancing radomes with reduced complexity (in terms of anisotropy indexes) able to let the original array reproduce the radiation performance of larger target apertures. Some representative numerical results are shown in order to validate the effectiveness of the proposed MbD approach, by taking into account the existing trade-off between the achievable boost and the overall cost in terms of complexity of the QCTO-synthesized meta-materials.M. SalucciG. OliveriN. AnselmiG. GottardiA. Massa2018-02-02T15:37:25Z2018-02-26T14:46:30Zhttp://eledia.science.unitn.it/publications/id/eprint/761This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7612018-02-02T15:37:25ZSynthesis of Metamaterial Enhancing Lenses for Improving the Radiation Performance of Existing Linear Antenna Arrays This work presents an innovative material-by-design (MbD) technique for the improvement of the radiation features (in terms of beam-width, directivity and side-lobe level) of existing linear scanned arrays. The developed strategy exploits a suitably customized quasi conformal transformation optics (QCTO) technique to synthesize meta-material radomes with reduced anisotropy as well as a source inversion (SI) strategy in order to let the original array mimic the radiation performance of significantly larger apertures. Some numerical results are presented ad discussed in order to validate the effectiveness of the MbD approach and its suitability to improve the radiation characteristics of linear arrays.M. SalucciG. OliveriN. AnselmiG. GottardiA. Massa2018-01-26T16:27:24Z2018-02-27T09:43:57Zhttp://eledia.science.unitn.it/publications/id/eprint/760This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7602018-01-26T16:27:24ZPerformance Enhancement of Linear Scanned Arrays through an Innovative Material-by-Design MethodologyA novel quasi conformal transformation optics (QCTO)-based approach is introduced for the synthesis of coating meta-lenses that are able to improve the radiation pattern of the covered linear antenna arrays. Thanks to the QCTO technique, the proposed material-by-design synthesis methodology is able to reduce the half-power beam-width (HPBW) and the side-lobe level (SLL) of a given linear array without introducing strong anisotropies in the synthesized meta-material coating lens. Some representative numerical examples are shown in order to assess the effectiveness, as well as the limits, of the proposed MbD method.
M. SalucciG. OliveriN. AnselmiG. GottardiA. Massa2018-01-19T16:11:14Z2018-02-26T15:58:10Zhttp://eledia.science.unitn.it/publications/id/eprint/759This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7592018-01-19T16:11:14ZA QCTO‐SI Method for the Design of Enhancing Lenses for Linear Antenna ArraysIn this work a novel material-by-design (MbD) strategy is proposed to address the problem of enhancing the radiation performance (in terms of directivity and side-lobe level) of existing linear phased arrays. Thanks to the integration of the quasi-conformal transformation optics (QCTO) technique with a customized source inversion (SI) strategy, the proposed approach enables the synthesis of meta-material lenses with reduced anisotropy indexes that are able to significantly enhance the radiation characteristics of linear antenna arrays, letting them mimic the performance of larger apertures. To prove the effectiveness of the MbD methodology, some numerical benchmarks are reported and discussed.M. SalucciG. OliveriN. AnselmiG. GottardiA. Massa2018-01-13T07:02:20Z2018-02-26T14:54:46Zhttp://eledia.science.unitn.it/publications/id/eprint/758This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7582018-01-13T07:02:20ZMaterial‐by‐Design as applied to Linear Antenna Array Performance ImprovementThis work deals with the problem of improving the radiation performances of linear active electronically scanned arrays (AESAs), without increasing the number of radiating elements nor requiring a re-design of the radiators and/or the feeding network. The problem is addressed by means of an innovative Material-by-Design (MbD) approach based on the quasi-conformal transformation optics (QCTO) technique and a customized source inversion (SI) strategy. The synthesized architectures are composed by a metamaterial lens and a tapered version of the original feeding network, able to match the radiation characteristics of significantly larger apertures. Some preliminary results are reported in order to validate the effectiveness of the proposed MbD approach.M. SalucciG. OliveriN. AnselmiG. GottardiA. Massa2018-01-06T08:39:16Z2018-02-26T14:53:41Zhttp://eledia.science.unitn.it/publications/id/eprint/757This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7572018-01-06T08:39:16ZEnhancement of Linear Antenna Arrays through an Innovative QCTO‐SI Method: Preliminary AssessmentIn this work, an innovative Material-by-Design (MbD) methodology is proposed to improve the radiation features of a linear active electronically-scanned array (AESA) without increasing the number of elements nor requiring the re-design of the radiators and/or feeding network. The quasi-conformal transformation optics (QCTO) approach is exploited to design an enhancing meta-material lens that is able to focus the radiated field of the original antenna. Moreover, a source inversion (SI) strategy is adopted to properly set the array excitations in order to match the radiation characteristics of significantly larger apertures. Some preliminary numerical results are reported and discussed.M. SalucciG. OliveriN. AnselmiG. GottardiA. Massa2017-11-10T15:19:44Z2018-02-26T13:28:32Zhttp://eledia.science.unitn.it/publications/id/eprint/756This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7562017-11-10T15:19:44ZEfficient Tiling of Large Planar Sub‐Arrayed Phased Arrays Through Schemata‐Driven Evolutionary OptimizationIn this work, the synthesis of large clustered arrays - computationally unaffordable through standard stochastic global optimization techniques - is addressed through an innovative schemata-driven approach. The proposed design methodology is based on the analytic definition of a set of reference tiling arrangements and a customized genetic algorithm (GA)-based strategy which is able to effectively and efficiently explore the solution space of the complete tiling configurations. Some representative numerical experiments are presented in order to verify the effectiveness of the developed synthesis technique for the tiling of large planar phased sub-arrays providing optimal side-lobe level (SLL) radiation performance.N. AnselmiP. RoccaM. SalucciA. Massa2017-11-03T14:36:46Z2018-02-26T13:29:19Zhttp://eledia.science.unitn.it/publications/id/eprint/755This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7552017-11-03T14:36:46ZAn Innovative GA‐Based Synthesis Method for the Design of Small‐Sized Tiled Planar Sub‐Arrayed Phased ArraysIn this work, an innovative methodology for the design of planar sub-arrayed phased arrays composed by irregular arrangements of vertical and horizontal domino-shaped tiles is presented. More precisely, the proposed design method is aimed at optimally synthesizing low and medium size arrays through a suitable customization of mathematical tiling theorems and algorithms. Thanks to the exploitation of a customized genetic algorithm (GA)-based optimization strategy, the retrieval of the global optimal solution for the problem of finding the complete tiling affording the minimum side-lobe level (SLL) is effectively yielded through the proposed approach. A set of numerical benchmarks is presented in order to assess the proposed sub-arraying technique for small-sized problems.N. AnselmiP. RoccaM. SalucciA. Massa