The Importance of Good Men in Your Life!

[EN] Presents a brief account of Professor Eva Antonino-Daviu's professional and personal life, highlighting the importance for a researcher-even if she is a woman with children-to live abroad and work in other laboratories, underlining that "men can take care of their children as well as women."Antonino Daviu, E. (2020). The Importance of Good Men in Your Life!. IEEE Antennas and Propagation Magazine. 62(5):144-149. https://doi.org/10.1109/MAP.2020.3013822S14414962

Analysis and design of antennas for wireless communications using modal methods

El diseño de antenas para los nuevos sistemas de comunicaciones inalámbricas ha suscitado un creciente interés en los últimos años. El principal objetivo de esta Tesis Doctoral es la propuesta de un método general de diseño de antenas para sistemas de comunicaciones inalámbricas que proporcione una visión física del proceso de diseño. Para alcanzar este objetivo, se propone el uso de un método basado en la descomposición modal de la corriente en la superficie del cuerpo conductor. Los modos tienen la ventaja de proporcionar una visión más física del comportamiento radiante de la antena, así como información muy útil para la optimización de la geometría de la antena y para la selección del mecanismo óptimo de alimentación y su localización. En la Tesis se realizará una revisión de los diferentes métodos modales disponibles, así como de los parámetros más importantes a tratar cuando se trabaja con soluciones modales. Además, se investigará un método para obtener expresiones cerradas para las corrientes superficiales en objetos conductores planos abiertos. Como se verá, los objetos planos con formas canónicas se pueden interpretar en muchas ocasiones como deformaciones de objetos tridimensionales cuyas superficies coinciden con las de algunos de los sistemas de coordenadas curvilíneas. De esta forma, se obtendrán expresiones cerradas para los modos vectoriales en un disco conductor circular y una tira plana infinita. Estas funciones se propondrán como funciones base de dominio completo en problemas más complejos que incluyan este tipo de superficies planas. Los modos de corriente definidos a partir de las funciones de onda vectoriales son de naturaleza compleja, lo que dificulta en ocasiones su uso para el diseño de antenas. Por el contrario, la Teoría de los Modos Característicos proporciona una descomposición de la corriente total en la superficie de un cuerpo conductor de forma arbitraria en un conjunto de modos reales, cuyos diagramas de radiación son ortogonalesAntonino Daviu, E. (2008). Analysis and design of antennas for wireless communications using modal methods [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/2188Palanci

Radiation Pattern Reconfigurable Antenna for IoT Devices

[EN] Based on the characteristic mode theory, a versatile radiation pattern reconfigurable antenna is proposed. )e analysis starts from two parallel metallic plates with the same and different dimensions. By means of two PIN diodes, the size of one of the parallel metallic plates can be modified and consequently the behavior of the radiation pattern can be switched between bidirectional and unidirectional radiation patterns. Moreover, a SPDT switch is used to adjust the frequency and match the input impedance. )e reconfigurable antenna prototype has been assembled and tested, and a good agreement between simulated and measured results is obtained at 2.5 GHz band which fits the IoT applications.This study was supported by the Spanish Ministry of Science and Innovation (Ministerio Ciencia e Innovacion) under project no. PID2019-107885GB-C32 and Generalitat Valenciana under project no. AICO/2019/018.Mahlaoui, Z.; Antonino Daviu, E.; Ferrando Bataller, M. (2021). Radiation Pattern Reconfigurable Antenna for IoT Devices. International Journal of Antennas and Propagation (Online). 2021:1-13. https://doi.org/10.1155/2021/5534063S113202

Radiation Pattern Agile Antenna using PIN Diodes and SPDT Switches

[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

Power Transfer Efficiency Analyzed using Characteristic Mode Coupling Between Two Parallel Loops

[EN] Independently of any electrical contact, running electronic devices such as smartphones, smart watches, RFID tags etc., is now attainable over small and large distances through Wireless Power Transfer technology. Although, designing systems maintaining appreciable power transfer efficiency still not always achievable. Using two parallel loops, the Theory of Characteristic Modes provides physical insight into the power transfer efficiency. Furthermore, to reach straightforward maximization of the modal power transfer efficiency, the focus of this paper is analyzing the impact of the separation distance and the overlapping between the two antennas on the characteristic modes and their contribution in the total efficiency of the power. The study considers different positions and frequencies of the two parallel antennas.This work has been supported by the Spanish Ministry of Science, Innovation and Universities (Ministerio Ciencia, Innovación y Universidades) under the project TEC2016- 78028-C3-3-P.Abderrazak, F.; Antonino Daviu, E.; Ferrando Bataller, M. (2020). Power Transfer Efficiency Analyzed using Characteristic Mode Coupling Between Two Parallel Loops. IEEE. 1-5. https://doi.org/10.23919/EuCAP48036.2020.9135229S1

Antenna Element Design Using Characteristic Mode Analysis: Insights and Research Directions

[EN] This article provides a comprehensive review of recent applications of characteristic mode analysis (CMA) to innovative antenna element designs, including multi port, circularly polarized, wideband, reconfigurable, and dielectric resonator antennas (DRAs). Emphasis is placed on the interpretation of the characteristic modes (CMs) for those unfamiliar with the method and physical insights gained from the characteristic eigenvalues and eigenvectors of an antenna. In addition, we review CMA-based design strategies and specific design examples that highlight the application of CMA to vari ous types of antennas. Ultimately, this article seeks to dem onstrate the value of CMA-based design insights for antenna engineering and look toward promising new research directions for CMA and antenna research.Adams, JJ.; Genovesi, S.; Yang, B.; Antonino Daviu, E. (2022). Antenna Element Design Using Characteristic Mode Analysis: Insights and Research Directions. IEEE Antennas and Propagation Magazine. 64(2):32-40. https://doi.org/10.1109/MAP.2022.3145718324064

Analysis of Magnetically-Coupled Loops Based On Characteristic Modes

[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

Design of a Dual-Band Frequency Reconfigurable Patch Antenna Based on Characteristic Modes

[EN] A frequency reconfigurable patch antenna design based on the characteristic mode analysis is presented. The antenna presents a reconfigurable lower band and a steady band at higher frequencies. A slot is etched on the ground plane of the antenna, where two varactor diodes are placed on each side of the slot in order to tune the lower band. The first resonant frequency shifts down by varying the reverse voltage of the varactor, whereas the second operating frequency keeps stable. The proposed antenna is designed to cover WLAN bands, offering a first band operating at 2GHz and a second band ranging from 5.3GHz to 5.8GHz. A prototype has been fabricated and measurements are provided, which validate the proposed analysis, method, and design procedure.This work has been supported by the Spanish Ministry of Science, Innovation and Universities (Ministerio Ciencia, Innovacion y Universidades) under the project TEC2016-78028-C3-3-P.Mahlaoui, Z.; Antonino Daviu, E.; Latif, A.; Ferrando Bataller, M. (2019). Design of a Dual-Band Frequency Reconfigurable Patch Antenna Based on Characteristic Modes. International Journal of Antennas and Propagation (Online). 2019:1-12. https://doi.org/10.1155/2019/4512532S1122019Zhu, F., Gao, S., Ho, A. T., Abd-Alhameed, R. A., See, C. H., Brown, T. W. C., … Xu, J. (2013). Multiple Band-Notched UWB Antenna With Band-Rejected Elements Integrated in the Feed Line. IEEE Transactions on Antennas and Propagation, 61(8), 3952-3960. doi:10.1109/tap.2013.2260119Cui, Y. H., Zhang, P. P., & Li, R. L. (2018). Broadband quad‐polarisation reconfigurable antenna. Electronics Letters, 54(21), 1199-1200. doi:10.1049/el.2018.5244Qin, P.-Y., Guo, Y. J., & Ding, C. (2013). A Dual-Band Polarization Reconfigurable Antenna for WLAN Systems. IEEE Transactions on Antennas and Propagation, 61(11), 5706-5713. doi:10.1109/tap.2013.2279219Elfergani, I. T. E., Hussaini, A. S., See, C. H., Abd-Alhameed, R. A., McEwan, N. J., Zhu, S., … Clarke, R. W. (2014). Printed monopole antenna with tunable band-notched characteristic for use in mobile and ultra-wide band applications. International Journal of RF and Microwave Computer-Aided Engineering, 25(5), 403-412. doi:10.1002/mmce.20874Nguyen-Trong, N., Hall, L., & Fumeaux, C. (2016). A Frequency- and Pattern-Reconfigurable Center-Shorted Microstrip Antenna. IEEE Antennas and Wireless Propagation Letters, 15, 1955-1958. doi:10.1109/lawp.2016.2544943Wright, M. D., Baron, W., Miller, J., Tuss, J., Zeppettella, D., & Ali, M. (2018). MEMS Reconfigurable Broadband Patch Antenna for Conformal Applications. IEEE Transactions on Antennas and Propagation, 66(6), 2770-2778. doi:10.1109/tap.2018.2819818Liu, Q., Wang, N., Wu, C., Wei, G., & Smolders, A. B. (2015). Frequency Reconfigurable Antenna Controlled by Multi-Reed Switches. IEEE Antennas and Wireless Propagation Letters, 14, 927-930. doi:10.1109/lawp.2014.2386694Simorangkir, R. B. V. B., Yang, Y., Hashmi, R. M., Bjorninen, T., Esselle, K. P., & Ukkonen, L. (2018). Polydimethylsiloxane-Embedded Conductive Fabric: Characterization and Application for Realization of Robust Passive and Active Flexible Wearable Antennas. IEEE Access, 6, 48102-48112. doi:10.1109/access.2018.2867696Antonino-Daviu, E., Cabedo-Fabres, M., Sonkki, M., Mohamed Mohamed-Hicho, N., & Ferrando-Bataller, M. (2016). Design Guidelines for the Excitation of Characteristic Modes in Slotted Planar Structures. IEEE Transactions on Antennas and Propagation, 64(12), 5020-5029. doi:10.1109/tap.2016.2618478Harrington, R., & Mautz, J. (1971). Theory of characteristic modes for conducting bodies. IEEE Transactions on Antennas and Propagation, 19(5), 622-628. doi:10.1109/tap.1971.113999

An Augmented Regularized Combined Source Integral Equation for Nonconforming Meshes

[EN] We present a new version of the regularized combined source integral equation (CSIE-AR) for the solution of electromagnetic scattering problems in the presence of perfectly conducting bodies. The integral equation is of the second kind and has no spurious resonances. It is well conditioned at all frequencies for simply connected geometries. Reconstruction of the magnetic field, however, is subject to catastrophic cancelation due to the need for computing a scalar potential from magnetic currents. Here, we show that by solving an auxiliary (scalar) integral equation, we can avoid this form of low-frequency breakdown. The auxiliary scalar equation is used to solve a Neumann-type boundary value problem using data corresponding to the normal component of the magnetic field. This scalar equation is also of the second kind, nonresonant, and well conditioned at all frequencies. A principal advantage of our approach, by contrast with the hypersingular electric field integral equation, the combined field integral equation, or CSIE formulations, is that the standard loop-star and related basis function constructions are not needed, and preconditioners are not required. This permits an easy coupling to fast algorithms such as the fast multipole method. Furthermore, the formalism is compatible with nonconformal mesh discretization and works well with singular (sharp) boundaries.This work was supported in part by the Spanish Ministry of Science and Innovation under Project TEC2016-78028-C3-3-P and in part by the Office of the Assistant Secretary of Defense for Research and Engineering and AFOSR through the NSSEFF Program under Award FA9550-10-1-0180.Vico Bondía, F.; Greengard, L.; Ferrando Bataller, M.; Antonino Daviu, E. (2019). An Augmented Regularized Combined Source Integral Equation for Nonconforming Meshes. IEEE Transactions on Antennas and Propagation. 67(4):2513-2521. https://doi.org/10.1109/TAP.2019.2891399S2513252167

Dual-Band Planar Antenna with AMC Screen for On-Body Applications

[EN] This paper presents a dual-band planar meander line antenna with an AMC screen for on-body applications. The antenna is aimed to operate at 0.86 and 2.4 GHz. The AMC screen is used to mitigate the effect of the human body into the antenna performance, so it has been designed to work appropriately in the two bands. Simulations of the AMC unit cell and the integration with the meander line antenna will be shown.This work has been supported by the Spanish Ministry of Science and Innovation (Ministerio de Ciencia e Innovación) under project PID2019-107885GB-C32.Antonino Daviu, E.; Chuquitarco-Jiménez, CA.; Abderrazak, F.; Ferrando Bataller, M. (2021). Dual-Band Planar Antenna with AMC Screen for On-Body Applications. IEEE. 1623-1624. https://doi.org/10.1109/APS/URSI47566.2021.97038551623162