High-Performance Computational Electromagnetic Methods Applied to the Design of Patch Antenna with EBG Structure

In this contribution High-Performance Computing electromagnetic methods are applied to the design of a patch antenna combined with EBG structure in order to obtain bandwidth enhancement. The electrical characteristics of the embedded structure (patch antenna surrounded by EBG unit cells) are evaluated by means of method of moment technique (MoM) whereas for designing the unit cell, the finite element method (FEM) together with the Bloch-Floquet theory is used. The manufactured prototypes are characterized in terms of return loss and radiation pattern in an anechoic chamber

A thin c-band polarization and incidence angle-insensitive metamaterial perfect absorber

A novel metamaterial absorber design able to operate in the C frequency band is presented, along with an analysis and a method to improve both its bandwidth and its angular stability. Simulation results for a FR4-based design are shown for comparison with existing designs. In addition, a simplified equivalent circuit is provided for a better understanding of the great angular stability and wide bandwidth exhibited by the proposed structure. Moreover, simulations, manufacturing and measurements of a thinner and more flexible metamaterial absorber, keeping the angular stability of the former one, while providing a wide bandwidth, are presente

On the introduction of lumped inductors for optimizing UHF band AMCs in terms of size and angular stability

Loughborough Antennas & Propagation Conference (LAPC, 2017, Loughborough, UK

Angular stability of metasurface perfect absorbers: advances on the design and limitations on measurement

XXXII Simposium Nacional de la Unión Científica Internacional de Radio, Universidad Politécnica de Cartagena, 6 a 8 de septiembre de 2017, Cartagena (España)The aim of this contribution is twofold. On the one hand, some guidelines will be given in order to improve the metasurface absorbers’ (MTAs) angular stability. In order to show that, two angularly stable MTAs are presented taking into consideration the common design specifications (resonance frequency, peak absorption, available dielectric materials and suitable bandwidth) that a designer has to meet. These MTAs are not only angularly stable but also its profile is extremely thin and hence, they can be conformed to whatever objects due to its flexibility. On the other hand, it will be provided a deep insight on the measurement limitations. A quasi-monostatic measurement set-up will be presented to perform measurements under both transverse electric (TE) and transverse magnetic (TM) polarizations varying the angle of incidence. The restrictions in the angular margin that can be measured according to the size of the manufactured finite MTA will be presente

Monostatic and Bistatic Measurements of Metasurfaces on Anechoic Chamber and a Comparison with Electromagnetic Simulations

European Conference on Antennas and Propagation (13th. 2019. Krakow, Poland

Facing the Angular Stabilization of Loop-Based Artificial Magnetic Conductors Through Lumped Inductors

2017 International Conference on Electromagnetics in Advanced Applications (ICEAA), 11 a 15 de septiembre de 2017, Verona (Italia)This work focuses in achieving the angular stabilization of a square loop-based AMC from a novel approach: by exploring the possibilities of introducing lumped inductors. The study is conducted considering the typical constraints an actual designer has to cope with (concerning limited size and dielectric thickness and properties). As a result, a stable AMC in the 5.8GHz band is obtained, meeting the design requirements. Due to its effectiveness, the novel developed methodology can be directly extended to enhance the angular stability of any loop-based AMC, wide spreading their application

Zirconia-Based Ultra-Thin Compact Flexible CPW-Fed Slot Antenna for IoT

An ultra-thin compact flexible CPW-fed slot monopole antenna suitable for the Internet of Things (IoT) applications was achieved as a result of exploring the use of Zirconia-based ENrG’s Thin E-Strate® for the antenna’s design. The electromagnetic characterization of the novel material at the frequency range of interest was analyzed. A comparison was made concerning the required dimensions and the simulation results regarding impedance matching and radiation properties, for three different dielectric substrates: Novel flexible ceramic (ENrG’s Thin E-Strate), rigid Arlon 25N, and flexible Polypropylene (PP). Two different metallization techniques—electrotextile-based and inkjet printing—were used in the fabrication of prototypes based on ENrG’s Thin E-Strate. Return losses measured results for the fabricated prototypes with both procedures was compared, as well as with simulation. The best prototype on the ENrG’s Thin E-Strate was compared with one on Arlon 25N, in terms of radiation properties in an anechoic chamber, and conclusions were drawn

Ultra-Thin Compact Flexible Antenna for IoT Applications

European Conference on Antennas and Propagation, EuCAP 2019 (13th. 2019. Poland

Broadband 3-D shared aperture high isolation nine-element antenna array for on-demand millimeter-wave 5G applications

The paper presents the results of a novel 3-D shared aperture 3 × 3 matrix antenna-array for 26 GHz band 5 G wireless networks. Radiation elements constituting the array are hexagonal-shaped patches that are elevated above the common dielectric substrate by 3.35 mm and excited through a metallic rod of 0.4 mm diameter. The rod protrudes through the substrate of 0.8 mm thickness. It is shown that by isolating each radiating element in the array with a wall suppresses unwanted electromagnetic (EM) wave interactions, resulting in improvement in the antenna’s impedance matching and radiation characteristics. Moreover, the results show that by embedding hexagonalshaped slots in the patches improve the antenna’s gain and radiation efficiency performance. The subwavelength length slots in the patches essentially transform the radiating elements to exhibit metasurface characteristics when the array is illuminated by EM-waves. The proposed array structure has an average gain and radiation efficiency of 20 dBi and 93%, respectively, across 24.0–28.4 GHz. The isolation between its radiation elements is greater than 22 dB. Compared to the unslotted array the improvement in isolation between radiating elements is greater than 11dB, and the gain and efficiency are better than 10.5 dBi, and 25%, respectively. The compact array has a fractional bandwidth of 16% and a form factor of 20 × 20 × 3.35 mm3.Dr. Mohammad Alibakhshikenari acknowledges support from the CONEX-Plus programme funded by Universidad Carlos III de Madrid and the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 801538. Also, this work was supported by Project RTI2018-095499-B-C31, funded by the Ministerio de Ciencia, Innovación y Universidades, Gobierno de España (MCIU/AEI/FEDER, UE)

4to. Congreso Internacional de Ciencia, Tecnología e Innovación para la Sociedad. Memoria académica

Este volumen acoge la memoria académica de la Cuarta edición del Congreso Internacional de Ciencia, Tecnología e Innovación para la Sociedad, CITIS 2017, desarrollado entre el 29 de noviembre y el 1 de diciembre de 2017 y organizado por la Universidad Politécnica Salesiana (UPS) en su sede de Guayaquil. El Congreso ofreció un espacio para la presentación, difusión e intercambio de importantes investigaciones nacionales e internacionales ante la comunidad universitaria que se dio cita en el encuentro. El uso de herramientas tecnológicas para la gestión de los trabajos de investigación como la plataforma Open Conference Systems y la web de presentación del Congreso http://citis.blog.ups.edu.ec/, hicieron de CITIS 2017 un verdadero referente entre los congresos que se desarrollaron en el país. La preocupación de nuestra Universidad, de presentar espacios que ayuden a generar nuevos y mejores cambios en la dimensión humana y social de nuestro entorno, hace que se persiga en cada edición del evento la presentación de trabajos con calidad creciente en cuanto a su producción científica. Quienes estuvimos al frente de la organización, dejamos plasmado en estas memorias académicas el intenso y prolífico trabajo de los días de realización del Congreso Internacional de Ciencia, Tecnología e Innovación para la Sociedad al alcance de todos y todas