Edoardo Zeni

A Hybrid Prefractal Three-Band Antenna for Multistandard Mobile Wireless Applications

In this letter, the synthesis of a miniaturized three-band planar antenna working in GSM and WiFi frequency bands is described. The reference geometry for the synthesis of the antenna is a hybrid prefractal shape obtained by integrating a Sierpinski-like and a Meander-like structure. The synthesis of the geometrical parameters of the antenna has been performed by means of a customized particle swarm strategy to yield electrical parameters within given specifications. In order to show the effectiveness of the approach, some results from the numerical synthesis procedure are described and a comparison between simulations and experimental measurements is reported.

A Monopolar Quad-Band Antenna Based on a Hilbert Self-Affine Prefractal Geometry

In this letter, the design of a quad-band antenna is presented. The antenna has a planar geometry printed on a dielectric substrate orthogonal to a reference ground plane and its geometrical parameters are optimized starting from a Hilbert-like prefractal reference shape. The reliability of the synthesized antenna is assessed by means of a set of experimental tests to verify its compliance with the project constraints.

Particle-swarm optimization of broadband nanoplasmonic arrays

We used the particle swarm optimization algorithm, an evolutionary computational technique, to design metal nanoparticle arrays that produce broadband plasmonic field enhancement over the entire visible spectral range. The resulting structures turn out to be aperiodic and feature dense Fourier spectra with many closely packed particle clusters. We conclude that broadband field-enhancement effects in nanoplasmonics can be achieved by engineering aperiodic arrays with a large number of spatial frequencies that provide the necessary interplay between long-range diffractive interactions at multiple length scales and near-field quasi-static coupling within small nanoparticle clusters.

Synthesis of a Galileo and Wi-Max Three-Band Fractal-Eroded Patch Antenna

In this letter, the synthesis of a three-band patch antenna working in E5-L1 Galileo and Wi-Max frequency bands is described. The geometry of the antenna is defined by performing a Koch-like erosion in a classical rectangular patch structure according to a Particle Swarm strategy to optimize the values of the electrical parameters within given specifications. In order to assess the effectiveness of the antenna design, some results from the numerical synthesis procedure are described and a comparison between simulations and experimental measurements is reported.

Optimized design of a multifunction/multiband antenna for automotive rescue systems

The development of efficient automotive accident management systems requires the design of complex multifunction antennas enabling different wireless services (e.g., localization, voice and data communications, emergency calls, etc.). Starting from different specifications (electrical, mechanical, and aerodynamic), the design of a multifunction antenna must consider, in addition to the usual antenna design requirements, also interference phenomena arising from the integration of different classes of antennas in a compact device. In this framework, the paper describes a methodology based on a stochastic multiphases optimization approach for the design of an integrated multifunction/multiband antenna system. Moreover, for an exhaustive assessment, the results of an experimental validation performed on a prototype of the multifunction antenna system are shown and discussed.

Design of a Prefractal Monopolar Antenna for 3.4-3.6 GHz Wi-Max Band Portable Devices

In this letter, the design of a miniaturized monopolar prefractal antenna for the 3.4-3.6 GHz WiMax band is presented. The geometrical configuration of the monopolar antenna, printed on a planar dielectric substrate, has been synthesized by means of a particle swarm optimizer in order to minimize the linear dimensions of the device and to obtain voltage standing wave ratio (VSWR) values within specifications. The results of numerical simulations are shown and compared, in terms of VSWR, with the experimental measurements

A DVBH/GSM/UMTS Planar Antenna for Multimode Wireless Devices

In this letter, the prototype of a planar antenna working in three different frequency bands and suitable to be integrated in multimode wireless devices is described. The antenna is fed by a single RF port without any matching circuit, and it operates in a DVBH channel and at GSM and UMTS frequency bands. Its dimension is of 0.15 lambda at the lower frequency band. The effectiveness and feasibility of the proposed antenna is assessed by means of both simulations and measurements.

Synthesis of a Prefractal Dual-Band Monopolar Antenna for GPS Applications

In this letter, the design of a monopolar dual-band antenna operating in the L1 and L2 GPS bands is presented. The prefractal geometry of the antenna has been synthesized by means of a particle swarm algorithm for optimizing the values of the electrical parameters within the specifications. For a general assessment, some selected results of numerical simulations are shown and some comparisons between numerical data and experimental measurements are presented

Synthesis and optimization of pre-fractal multiband antennas

Nowadays electronic products often employ more than one wireless standards for data exchange, requiring the adoption of multi-band components and devices. In this framework in the paper the design of a monopolar dual-band antenna operating in the L1 and L2 GPS bands is presented. The pre-fractal geometry of the antenna has been synthesized by means of a Particle Swarm algorithm for optimizing the values of the electrical parameters within the specifications. In the paper some selected results of numerical simulations are shown and some comparisons between numerical and experimental data are presented.

Design of non-harmonic multi-band pre-fractal antennas

In this paper, an innovative fractal-based methodology is proposed for synthesizing antennas with complete and unconstrained multi-band behaviors. By assuming pre-fractal geometries as reference structures, the synthesis process is faced with an optimization procedure aimed at suitably tuning the geometrical characteristics of the antenna. In order to preliminary assess the effectiveness and accuracy of the proposed approach, the design of a planar dual-band L1 GPS antenna is described and discussed.