ELEDIA Student Project Activities and Theses Reports: No conditions. Results ordered -Date Deposited. 2018-05-26T21:14:30ZEPrintshttp://eledia.science.unitn.it/images/eledialogo.pnghttp://eledia.science.unitn.it/publications/7152012018-05-10T07:18:53Z2018-05-10T07:18:53Zhttp://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. Massa2017-10-27T15:04:23Z2018-02-26T13:28:00Zhttp://eledia.science.unitn.it/publications/id/eprint/754This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7542017-10-27T15:04:23ZDesign of Planar Sub‐Arrayed Phased Arrays Through Irregular Domino‐Shaped TilesIn this work, the design of planar sub-arrayed phased arrays through irregular domino-shaped tiles is presented. An innovative enumerative approach is exploited to synthesize the optimal clustering in order to obtain the maximum aperture coverage and radiation performance. Moreover, a design procedure based on optimal tiling theorems drawn from mathematical theory and exploiting a customized genetic algorithm (GA) optimizer to effectively minimize a suitably defined cost function is proposed. Some preliminary numerical results are presented in order to assess the potentialities of the proposed synthesis methods for small-sized arrays.N. AnselmiP. RoccaM. SalucciA. Massa2017-10-16T07:31:11Z2018-02-26T14:43:58Zhttp://eledia.science.unitn.it/publications/id/eprint/753This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7532017-10-16T07:31:11ZSynthesis of Wideband WAIMs within the System‐by‐Design FrameworkIn this work, the design of wideband wide-angle impedance matching (WAIM) structures is proposed for waveguide-fed planar phased arrays. An innovative System-by-Design (SbD) approach is exploited to determine the geometrical descriptors of the WAIM, which is composed by a metasurface of regularly-arranged microstrip printed unit cells. The proposed solution technique is based on the combination of elementary functional blocks aimed at (i) exploring the search space, (ii) analyzing the resulting metasurface structure to deduce the equivalent permittivity/permeability tensors, (iii) computing the phased array response, and (iv) linking the obtained result with the problem constraints and objectives to determine the associated cost function. Some numerical results are shown in order to assess the effectiveness of the SbD-based design strategy.G. OliveriM. SalucciN. AnselmiA. Massa2017-10-09T07:57:30Z2018-02-26T13:35:15Zhttp://eledia.science.unitn.it/publications/id/eprint/752This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7522017-10-09T07:57:30ZParticle Swarm Optimization of Innovative Wide Angle Impedance Matching MetasurfacesThe design of innovative wide-angle impedance matching (WAIM) structures is proposed to mitigate reflection issues arising when scanning waveguide-fed planar phased arrays. The WAIM is based on a metasurface which is composed by several unit cells arranged according to a triangular lattice. A System-by-Design (SbD) approach is exploited to synthesize - by means of a customized particle swarm optimization (PSO)-based algorithm - the geometrical descriptors of such a metasurface in order to reduce the reflections when steering the main beam of the array. Numerical results are shown in order to verify the effectiveness as well as the potentialities of the developed design strategy.G. OliveriM. SalucciN. AnselmiA. Massa2017-10-02T08:11:43Z2018-02-26T14:43:25Zhttp://eledia.science.unitn.it/publications/id/eprint/749This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7492017-10-02T08:11:43ZInnovative Design of Metamaterial Printed WAIMs through a System-by-Design ApproachAn innovative approach is proposed for the synthesis of WAIM structures able to compensate the inter‐element coupling effects limiting the maximum scanning angles of active electronically‐scanned arrays (AESAs). The WAIM is composed by a metasurface represented by a regular grid of microstrip printed unit cells organized according to an hexagonal lattice. Accordingly, the geometrical descriptors of the unit cells are synthesized through a System‐by‐Design (SbD) approach aimed at minimizing the antenna input reflections caused by impedance mismatching when the array is steered. Some numerical results are shown in order to assess the effectiveness of the proposed design methodology.G. OliveriM. SalucciN. AnselmiA. Massa2017-09-22T15:04:34Z2018-02-26T13:35:59Zhttp://eledia.science.unitn.it/publications/id/eprint/748This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7482017-09-22T15:04:34ZA System‐by‐Design Approach for the Synthesis of WAIMs for Planar ArraysIn this work, wide-angle impedance matching (WAIM) layers based on metasurfaces are designed to enhance the radiation efficiency of planar phased arrays. Toward this end, a System-by-Design (SbD) approach is adopted where the layer geometrical features are the solution descriptors, while the minimization of the array power reflection is the synthesis objective. Selected numerical examples are shown to illustrate the potentialities of the proposed SbD-based design strategy.G. OliveriM. SalucciN. AnselmiA. Massa2017-09-15T11:56:56Z2018-02-26T13:34:04Zhttp://eledia.science.unitn.it/publications/id/eprint/747This item is in the repository with the URL: http://eledia.science.unitn.it/publications/id/eprint/7472017-09-15T11:56:56ZInnovative Synthesis of WAIM Layers for Waveguide‐Fed Planar Phased ArraysThis work deals with the design of wide-angle impedance matching (WAIM) layers aimed at mitigating reflection issues arising in waveguide-fed planar phased arrays. The synthesis problem is formulated within the System-by-Design (SbD) framework, by minimizing the antenna input reflections caused by impedance mismatching when the array is steered through the optimization of the geometrical descriptors of the WAIM unit cells. Some numerical results are shown in order to assess the effectiveness of the proposed synthesis strategy.G. OliveriM. SalucciN. AnselmiA. Massa