Información, Codificación y Comunicación

El objetivo es que el alumno domine los conceptos de información, codificación y comunicación y cómo están interrelacionados entre sí. Asimismo, se pretende un primer acercamiento a los diferentes tipos de codificación utilizados en comunicaciones, así como a los sistemas digitales de codificación, desde una perspectiva histórica.Bachiller Martin, MC. (2020). Información, Codificación y Comunicación. http://hdl.handle.net/10251/143154DE

Augmented and Virtual Reality to Enhance the Didactical Experience of Technological Heritage Museums

[EN] The way that the new generations approach cultural contents changed dramatically. The audiovisual language substituted traditional media. Museums face now an important challenge to survive as cultural referents in this new paradigm: the introduction of new audiovisual languages in their exhibitions and the provision of attractive online content. The work presents a case study of the use of augmented reality and virtual reality (AR/VR) in a technological heritage museum, with a double approach: on the one hand the development of AR to enhance the real visit to the museum; and on the other, the provision of VR to ease online visits to the museum for those that do not want to or cannot visit it. The results show that young visitors massively appreciate the use of these technologies. Using AR contents also contributes to the preservation of the original artifacts without damage. Furthermore, multimedia content provides some contextual information, improving the learning experience. Regarding the VR application, it is thought as a complement to the AR experience. It was developed as a virtual reproduction of the museum visit that can be experienced from any location, thus contributing to a higher diffusion of the museum contents.This research was funded by Generalitat Valenciana Conselleria de Educacion, Investigacion, Cultura y Deporte, grant number EXP. 2018/618-V, Exp. 2019/0699, CUMUBI/2020/46/7, CUMUBI/2021/46/12, CUMUBI/2022/46/75.Bachiller Martin, MC.; Monzó Ferrer, JM.; Rey, B. (2023). Augmented and Virtual Reality to Enhance the Didactical Experience of Technological Heritage Museums. Applied Sciences. 13(6):1-17. https://doi.org/10.3390/app1306353911713

Telecochips: Promoting Telecommunications Engineering among Young Students.

The study of Science, Technology, Engineering and Mathematics (STEM) has suffered a strong decrease during the last decade in Western Countries. The causes of this decrease are very diverse, but it seems necessary to take actions to improve the perception that the future students have about these studies and to approach technology to high school classrooms. Telecochips is a pool of activities designed for promoting the engagement of high school students for Telecommunication and Electronic Engineering in the UPV Universitat Politècnica de València (Spain).Bachiller Martin, MC.; Conejero, JA. (2015). Telecochips: Promoviendo la Ingeniería en Telecomunicación entre los Jóvenes Estudiantes. VAEP-RITA. Versión Abierta Español-Portugués. 3(2):68-75. http://hdl.handle.net/10251/65948S68753

Práctica de Laboratorio: Resolución de las Ecuaciones del EM en RPS. Problemas de Polarización.

La propagación de ondas planas tiene un componente teórico y otro práctico, como parte del componente práctico se tiene la resolución de problemas complejos que tienen que ver tanto con los parámetros y definición de la onda, como con la polarización de la misma. Los alumnos reciben en las clases teóricas suficiente información para poder resolver dichos problemas, pero sólo enfrentándose a ellos puede adquirir la competencia para resolverlos adecuadamente. Muchas veces los alumnos se quejan de que los exámenes son demasiado complejos o largos, que no están acostumbrados a trabajar bajo presión y que sabiendo resolverlos ¿los nervios los traicionan¿, una forma de evitar que esto ocurra puede ser que se hayan enfrentado con antelación a esa experiencia pero sin consecuencias negativas.Bachiller Martin, MC.; Fuster Escuder, JM. (2013). Práctica de Laboratorio: Resolución de las Ecuaciones del EM en RPS. Problemas de Polarización. http://hdl.handle.net/10251/2932

Práctica de Laboratorio: Incidencia en Ondas Planas

En este artículo se presenta un resumen de la teoría básica de Incidencia de Ondas Planas. Es una práctica de aula, ya que el alumno no va a utilizar recursos de laboratorio si no sus propios recursos didácticos: apuntes de clase y libros. Esta práctica se puede trabajar de forma individual o en grupo, pero siempre de forma autónoma porque se pretende que el alumno se enfrente a la resolución de problemas complejos antes de asistir a los actos de evaluación de la asignatura. La colección de problemas se entregará a la entrada a la práctica y los alumnos deberán resolverla durante las dos horas de duración de la misma. La resolución de los problemas se publicará en Poliformat tras la práctica con la idea que el alumno puede autoevaluarse.Bachiller Martin, MC.; Fuster Escuder, JM. (2013). Práctica de Laboratorio: Incidencia en Ondas Planas. http://hdl.handle.net/10251/2935

Práctica de Laboratorio: Ondas Guiadas

En este artículo se presenta un resumen de la teoría básica de Propagación de Ondas Guiadas. Es una práctica de aula, ya que el alumno no va a utilizar recursos de laboratorio si no sus propios recursos didácticos: apuntes de clase y libros. Esta práctica se puede trabajar de forma individual o en grupo, pero siempre de forma autónoma porque se pretende que el alumno se enfrente a la resolución de problemas complejos antes de asistir a los actos de evaluación de la asignatura. La colección de problemas se entregará a la entrada a la práctica y los alumnos deberán resolverla durante las dos horas de duración de la misma. La resolución de los problemas se publicará en Poliformat tras la práctica con la idea que el alumno puede autoevaluarse.Bachiller Martin, MC.; Fuster Escuder, JM. (2013). Práctica de Laboratorio: Ondas Guiadas. http://hdl.handle.net/10251/2935

Space Qualification of Metalized Additive Manufactured Filters

[EN] The space industry is seeking new solutions for the development of lightweight, inexpensive and easy-to-manufacture on-board communication payload devices. One of the proposed technologies is additive manufacturing (AM) of polymeric materials that are subsequently metallized. The devices developed using this technique must be operational in the particular space environment conditions. In this work we study the integrity of filters made by additive manufacturing against the extreme conditions of mechanical stress, temperature and power management as described in the standard of the European Space Agency (ESA) for satellite payload. To carry out this qualification for space, two types of X-band filters with identical frequency responses have been designed and manufactured: a classic H-plane waveguide cavities filter, and three filters on surface-mount technology (SMT). Two of the SMT filters are low height rectangular cavities filters, while the third one is a high circular cavities filter. This selection was intended to verify that the AM technique offered good results regardless of the devices topology. Two mechanical vibration tests were performed: sinusoidal sweep and random vibration. These tests emulate the transport and launching conditions of the satellite payload. Furthermore, it was measured the mechanical natural frequency of the filters, and its variation after being exposed to the tests in order to evaluate their physical integrity. The thermal analysis was performed emulating the temperature profile experienced by the satellite payload during working conditions. Then, the power handling tests were carried out. The secondary electron emission yield of the material (metallized polymer) was firstly measured. The power levels, location and frequency at which a multipactor discharge would occur were analyzed for both, low-height and standard-height, filters. Finally, both filters were subjected to those power levels, under high vacuum conditions, to check if the said multipactor discharges occurred. The mechanical stress and temperature tests prove that the developed filters can survive the hard launching and operation conditions of commercial satellite payloads. The multipactor tests report the high power levels that the devices can handle without risk of radiofrequency (RF) breakage. All these tests allow to fully qualify the proposed manufacturing technique for spatial applications.This work was supported in part by the Agencia Valenciana de la Innovacion Research Project under Grant INNVA1/2020/84; in part by the Agencia Estatal de Investigacion, Spain, through the Fellowship for Training PhDs under Grant BES-2017-079728; and in part by the Ministerio de Ciencia e Innovacion (MICIN), Spanish Government through the Research and Development Project PID2019-103982RB-C41 under Grant MICIN/AEI/10.13039/501100011033.Bachiller Martin, MC.; Nova-Giménez, V.; Ferrer, Á.; Boria Esbert, VE. (2022). Space Qualification of Metalized Additive Manufactured Filters. IEEE Access. 10:96952-96966. https://doi.org/10.1109/ACCESS.2022.320540896952969661

Controlled Out-of-Band Rejection of Filters based on SIW with Alternating Dielectric Line Sections

© 2019 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.[EN] A study for managing the out-of-band rejection in a new topology of filters based on substrate integrated waveguide with alternating dielectric line sections (ADLSs) is presented in this letter. ADLS is a filtering structure consisting on line sections of the same width but with alternating air and dielectric filling. The design of the lengths of each section provides the central frequency and the bandwidth of bandpass filter response. The proper selection of the structure substrate dielectric permittivity can increase the rejection band up to 2 f(o). Moreover, the selection of the filter order (i.e., the number of sections with and without dielectric) can affect the depth of the rejection band. A study of the width and the depth of the rejection band is performed with different permittivities and orders for two different filters. Then, for validation purposes, the prototypes of both filters have been manufactured and measured.This work was supported in part by the Generalitat Valenciana Research Project under Grant PROMETEOII/2015/005, in part by the Ministerio de Educacion, Cultura y Deporte, Spain, through the Fellowship Program for Training University Professors under Grant FPU14/00150, and in part by the Ministerio de Economia y Competitividad, Spain, through Research and Development Project under Grant TEC2016-75934-C4-1-R.Sánchez-Marín, JR.; Bachiller Martin, MC.; Nova-Giménez, V.; Boria Esbert, VE. (2019). Controlled Out-of-Band Rejection of Filters based on SIW with Alternating Dielectric Line Sections. IEEE Microwave and Wireless Components Letters. 29(4):258-260. https://doi.org/10.1109/LMWC.2019.2902034S25826029

Reconfigurable Resonator in Decoupled Empty SIW Technology Using Liquid Crystal Material

"This paper is a postprint of a paper submitted to and accepted for publication in Electronics Letters and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library"[EN] This paper presents a novel continuously tunable microwave resonator based on Liquid Crystal (LC) material. The reconfigurable device is implemented in Decoupled Empty Substrate Integrated Waveguide (DESIW) technology. DESIW technology allows both magnetic and electric DC (or low frequency) biasing of the LC. The resonator is continuously tunable in a range of 600 MHz, resulting in a measured tunability range of 8.5% around a centre frequency of 7 GHz. Moreover, the measured insertion loss of the reconfigurable device is between 4.3 dB and 6.8 dB, thus obtaining a Q-factor of 190-172.This work was partially funded by the Generalitat Valenciana research project PROMETEOII/2015/005, by the Ministerio de Educación, Cultura y Deporte (Spain) under the Fellowship Program for Training University Professors FPU14/00150, and by Ministerio de Economía y Competitividad (Spain) under R&D project TEC2016-75934-C4-1-R.Sánchez-Marín, JR.; Bachiller Martin, MC.; Nova-Giménez, V.; Boria Esbert, VE. (2019). Reconfigurable Resonator in Decoupled Empty SIW Technology Using Liquid Crystal Material. Electronics Letters. 55(16):907-910. https://doi.org/10.1049/el.2019.1088S9079105516Sekar, V., Armendariz, M., & Entesari, K. (2011). A 1.2–1.6-GHz Substrate-Integrated-Waveguide RF MEMS Tunable Filter. IEEE Transactions on Microwave Theory and Techniques, 59(4), 866-876. doi:10.1109/tmtt.2011.2109006Adhikari, S., Ban, Y.-J., & Wu, K. (2011). Magnetically Tunable Ferrite Loaded Substrate Integrated Waveguide Cavity Resonator. IEEE Microwave and Wireless Components Letters, 21(3), 139-141. doi:10.1109/lmwc.2010.2102746Prasetiadi, A. E., Karabey, O. H., Weickhmann, C., Franke, T., Hu, W., Jost, M., … Jakoby, R. (2015). Continuously tunable substrate integrated waveguide bandpass filter in liquid crystal technology with magnetic biasing. Electronics Letters, 51(20), 1584-1585. doi:10.1049/el.2015.2494Yaghmaee, P., Fumeaux, C., Bates, B., Manabe, A., Karabey, O. H., & Jakoby, R. (2012). Frequency tunable S-band resonator using nematic liquid crystal. Electronics Letters, 48(13), 798. doi:10.1049/el.2012.1366Sánchez, J. R., Bachiller, C., Esteban, H., Belenguer, A., Nova, V., & Boria, V. (2017). New decoupled empty substrate integrated waveguide realisation. Electronics Letters, 53(17), 1203-1205. doi:10.1049/el.2017.1240Yang, D.-K., & Wu, S.-T. (2006). Fundamentals of Liquid Crystal Devices. doi:10.1002/0470032030Belenguer, A., Esteban, H., & Boria, V. E. (2014). Novel Empty Substrate Integrated Waveguide for High-Performance Microwave Integrated Circuits. IEEE Transactions on Microwave Theory and Techniques, 62(4), 832-839. doi:10.1109/tmtt.2014.2309637Munk, B. A. (2000). Frequency Selective Surfaces. doi:10.1002/0471723770Esteban, H., Belenguer, A., Sanchez, J. R., Bachiller, C., & Boria, V. E. (2017). Improved Low Reflection Transition From Microstrip Line to Empty Substrate-Integrated Waveguide. IEEE Microwave and Wireless Components Letters, 27(8), 685-687. doi:10.1109/lmwc.2017.272401

Study of Vibration Effects on Communication Filters in Substrate Integrated Technologies

(c) 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.[EN] The growing need of space communication systems forces the industry to innovate in order to provide more robust, economical and flexible solutions. The new substrate integrated technologies enable the development of on-board communications devices with less weight and volume than the traditional waveguide-based ones. However, it is necessary to analyse the performance of these devices in the particular working conditions of satellite communications. This work studies the integrity of the electrical response of advanced communication filters under mechanical stress conditions. Four realisations of a Ku-band microwave filter in different substrate integrated technologies were developed and tested. Two mechanical vibration tests were performed: sinusoidal sweep and random vibration. These tests emulate the transport and launching conditions of the satellite payload. Furthermore, the mechanical natural frequency of the filters and its variation after being exposed to the tests have been measured to evaluate the devices integrity. For all the filters, this frequency variation is lower than 5 %, the standard threshold. This proves that the developed filters can survive the launching conditions of satellite payload, thus qualifying the technology for spatial applications.This work was supported in part by the Generalitat Valenciana Research Project (PROMETEO/2019/120); in part by the Agencia Estatal de Investigacion, Spain, under the Fellowship for Training Ph.D.s (BES-2017-079728); in part by the Ministerio de Ciencia e Innovacion (MICIN), Spanish Government, under Research and Development Project PID2019-103982RB-C41 (funded by MICIN/AEI/10.13039/501100011033); and in part by the Conferencia de Rectores de las Universidades Espanolas (CRUE)-Universitat Politecnica de Valencia (by paying the open access charge).Merello, JM.; Bachiller Martin, MC.; Nova-Giménez, V.; Esteban González, H.; Belenguer, Á. (2022). Study of Vibration Effects on Communication Filters in Substrate Integrated Technologies. IEEE Access. 10:50418-50426. https://doi.org/10.1109/ACCESS.2022.317326450418504261