1,721,014 research outputs found
A broadband pattern diversity annular slot antenna
No full textAn annular slot antenna suitable for pattern diversity in wideband applications is presented. Pattern diversity is obtained by feeding the antenna simultaneously with two microstrip lines printed on the back of the substrate, which generate orthogonal radiation patterns. Two shorts placed at 45° degrees between the microstrip lines and in the opposite direction ensure an isolation above 15 dB according to measurements. The antenna operates in the range of frequencies from 3 GHz to 12 GHz (1:4 bandwidth) and covers many different standards (Wireless-LAN, HIPERLAN2, WIMAX, UWB). Simulations and measurements for return loss, isolation and radiation patterns are presented. Furthermore, measurements have been carried out in a real multipath environment in order to evaluate pattern diversity performance. Results of measurements of the correlation coefficient and diversity gain over the entire operating bandwidth show that the antenna is suitable for antenna diversity systems. © 2006 IEEE.This work was supported by the Spanish Ministerio de Ciencia y Tecnologia under project TEC2010-20841-C04-01.Gallo, M.; Antonino Daviu, E.; Ferrando Bataller, M.; Bozzetti, M.; Molina García-Pardo, JM.; Juan Llacer, L. (2012). A broadband pattern diversity annular slot antenna. IEEE Transactions on Antennas and Propagation. 60(3):1596-1600. https://doi.org/10.1109/TAP.2011.2180314S1596160060
Design of a multimode MIMO antenna using characteristic modes
No full textIn this communication, the design procedure of a multimode multiple-input multiple-output (MIMO) antenna is presented. The antenna consists of a metallic ring antenna operating with different orthogonal modes, whose performance in a MIMO system is similar to traditional antenna arrays. Thus, a compact MIMO antenna is obtained, which is very suitable for mobile terminals. A modal analysis of the antenna is carried out first by means of the theory of characteristic modes, in order to identify the different radiating modes of the antenna. Then a set of feeding configurations is proposed so as to excite these modes. As the modes must operate in the same frequency band, a loading technique is used in the antenna in order to shift the resonance frequency of the modes to the proper band
A Dual-Band Dual-Polarized Antenna Design for a Weather Radar with Characteristic Modes Analysis and MoM
Full text link[EN] We describe here an antenna design to be used in
a weather Radar for hydrometeors detection and
characterization. This antenna could operate in two frequency
bands and with any polarization. The proposed model was
analyzed and optimized using two simulation methods:
Characteristic Modes and Method of Moments.Rodríguez, GD.; Ciafardini, JP.; García, RE.; Ferrando Bataller, M. (2022). A Dual-Band Dual-Polarized Antenna Design for a Weather Radar with Characteristic Modes Analysis and MoM. IEEE. 1-6. https://doi.org/10.1109/ARGENCON55245.2022.9976401S1
Multimode Antenna for GPS Applications
No full text[EN] This paper presents a compact multimode
antenna for GPS applications, where multiple modes are
excited in order to achieve radiation pattern diversity. Based
on the Characteristic Mode Analysis of a rectangular plate of
80 mm x 54 mm, a practical implementation of the excitation
network is presented.This work has been supported by the Spanish Ministry of
Economy and Competitiveness (Ministerio de Economía y Competitividad) under project TEC2016-78028-C3-3-P and
Generalitat Valenciana under project AICO/2019/018.Antonino Daviu, E.; Ferrero, F.; Ferrando Bataller, M. (2020). Multimode Antenna for GPS Applications. IEEE. 1-3. https://doi.org/10.1109/iWAT48004.2020.1570609891S1
Optimization of 2D Heterogeneous Lenses via BFGS and Volume Integral Equation Method
Full text link[EN] In this paper we apply a quasi-Newton optimization algorithm called BFGS to optimize heterogeneous lenses in 2D by using the volume integral equation method. Different preliminary designs are presented with frequency selective focal point.This work has been supported by the Spanish Ministry of Science and Innovation (Ministerio Ciencia e Innovacion) under project PID2019-107885GB-C32. We would like to thank Prof. Leslie Greengard and for many useful discussions.Vico Bondía, F.; Cabedo Fabres, M.; Ferrando Bataller, M.; Antonino Daviu, E. (2021). Optimization of 2D Heterogeneous Lenses via BFGS and Volume Integral Equation Method. IEEE. 1657-1658. https://doi.org/10.1109/APS/URSI47566.2021.9704775S1657165
Analysis of Magnetically-Coupled Loops Based On Characteristic Modes
Full text link[EN] A preliminary numerical magnetic field study of a wireless power transfer system composed of two interconnected source loops is addressed in this paper. The key feature of this study is to propose a new configuration capable of maintaining a uniform magnetic field density between the two loops. Furthermore, it has been shown that the Theory of Characteristic Modes is a helpful tool for investigating the near field of the magnetically-coupled loops.Abderrazak, F.; Antonino Daviu, E.; Ferrando Bataller, M.; Taldi, L. (2020). Analysis of Magnetically-Coupled Loops Based On Characteristic Modes. IEEE. 121-122. https://doi.org/10.1109/IEEECONF35879.2020.9329736S12112
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Radiation Pattern Agile Antenna using PIN Diodes and SPDT Switches
Full text link[EN] In this paper, a new design of a reconfigurable
antenna is proposed. The antenna structure is using two PIN
diodes for switching between two radiation patterns (directional
and bidirectional) and a SPDT switch to achieve good impedance
matching. The simulated results show a good impedance matching,
with S11 below -10 dB using the SPDT switch configuration.
In addition, the far-field directivity for both configurations is
around 5 dB.Zakaria, M.; Antonino Daviu, E.; Ferrando Bataller, M. (2020). Radiation Pattern Agile Antenna using PIN Diodes and SPDT Switches. IEEE. 1771-1772. https://doi.org/10.1109/IEEECONF35879.2020.9329761S1771177
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