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The synthesis of metamaterial devices able to enhance the features (radiation, size, etc.) of advanced antenna system is addressed in this work through an innovative surrogate-assisted optimization strategy. The design technique, which belongs to the class of System-by-Design methodologies, integrates a multi-agent cooperative evolutionary optimization technique with a surrogate model used to predict...
Compressive Sensing (CS) represents a powerful and flexible paradigm that applies to the solution of both sampling problems (i.e. identifying the minimum [below Nyquist's limit] number of non-adaptive samples that enable to acquire all the informative content of a given signal) and of recovery problems (i.e., perfectly retrieving a signal from far fewer measurements than those expected by Shannon's...
The analysis of the tolerance effects on the radiated power pattern caused by the fabrication errors in the printing of the microstrip patches of reflectarrays is addressed through a method based on the Interval Analysis and the arithmetic of intervals. The dimensions of the microstrip patches are defined as intervals of values including the tolerance errors and the mathematics of intervals is exploited...
The synthesis of high-performance and complex electromagnetic devices is carried out through an innovative approach. The features of metasurfaces and metamaterials are exploited to design innovative field manipulation devices. More in detail, a set of instances of the System-by-Design paradigm are applied to the synthesis of metasurface and metamaterial-enhanced electromagnetic devices in order to...
The design of wireless transmission systems able to deliver power over long distances in practical applications represent an challenging task because of the specific requirements in terms of end-to-end efficiency, robustness, and reliability. As a consequence, ad-hoc design procedures have been developed in the literature. In this framework, innovative methodologies are currently proposed to design...
After a short review on the key-stones of EA-based approaches for electromagnetic engineering, this paper is aimed at analyzing current limitations of EAs for successively giving an overview on some EA-advances for enabling their effective and reliable application to EM problems concerned with the synthesis of systems and devices.
This paper is aimed at analyzing and discussing the key-role of the evolutionary optimization in EM device synthesis carried out within the recently developed System-by-Design paradigm. Towards this end, SbD models the design process as an eco-system of functional blocks (for the synthesis/analysis of each sub-part of the overall complex system) suitably connected to enable different trade-off solutions...
Time modulated arrays (TMA) use radio-frequency (RF) switches to modulate in time the static excitation weights of an ordinary phased array to shape the antenna radiation diagram. The on-off commutation of the switches, which are controlled by means of a periodic pulse sequence, generates harmonics that are spaced in frequency by multiple of the pulse repetition frequency. These harmonics, whether...
Wireless power transmission (WPT) through microwave beams represents a key technology for the longdistance transfer of energy in the absence of a traditional electrical network. Its importance is demonstrated by the increasing research and industrial activities concerned with the design, manufacturing, and prototyping of efficient WPT systems. In this framework, several design methodologies are being...
The design of an innovative rectenna system, to be used for collection of the energy delivered from space solar power satellites, is presented in this work. The problem is formulated as an optimization one, where the positions of the antenna elements are properly chosen, to maximize the total amount of power received by the rectenna. A number of options are presented, by looking to the problem from...
In this work, the Contiguous Partition Method (CPM) and the Bayesian Compressive Sensing (BCS) approaches are applied to the synthesis of large arrays for wireless power transmission (WPT). The methodologies are employed with a twofold objective: on the one hand, to achieve high beam collection efficiencies (BCE) and low sidelobes; on the other hand, to simplify the overall array complexity/costs...
An analytical technique for the synthesis of planar arrays for wireless power transmission is proposed whose aim is to maximize the ratio between the power collected at the receiver to the total transmitted power. The array weights are optimized through an analytical methodology which formulates the synthesis process as a generalized eigenvalue problem. The methodology can be applied for arbitrary...
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