Autor: Héctor García Martínez
Directores: Germán Torregrosa Penalva y Ernesto Ávila Navarro
Fecha de lectura: Jueves 11 de marzo de 2021
Abstract: Additive manufacturing techniques and 3D printing are currently generating great interest in a wide variety of industrial sectors ¿ such as medicine, science and technology. Over the past few years, the cost reduction of commercial 3D printers has meant that additive manufacturing is no longer used solely for rapid prototyping, but also for making components that can be used by the end user. In addition, the advantages gained by using this technology (complex structures can be produced in a very short time, the efficiency of the material used, materials can be combined and the low-cost) have also attracted research scientists, who have used the technology in many of their research studies. Recently, additive manufacturing techniques have appeared in the development of microwave devices and the number of research studies on this subject is growing year on year.
This doctoral thesis, which has been dedicated to the development and manufacture of high-frequency devices using 3D printing techniques, has contributed to this research field. In particular, it focuses on the production of microwave circuits in various different technologies (microstrip, stripline, multilayer and waveguide), using a low cost 3D printer. The circuits were designed, manufactured and characterized experimentally, demonstrating the great potential and flexibility that additive manufacturing has in the implementation of high-frequency devices.
The doctoral thesis is organized into six chapters, in which the most significant advances and results achieved are presented. They have led to four publications, which are included in Journal Citation Reports.
The first chapter gives an introduction to the field in which the thesis is situated, together with the state of the art of additive manufacturing. Here, the objectives to be achieved during the development of this work are presented.
The second chapter presents the implementation of the lowcost 3D printer and the additive manufacturing technology used in this work, describing the manufacturing process of a substrate for high-frequency applications and analysing the electrical and mechanical properties of various different 3D printing materials.
The third chapter describes the implementation of various high-frequency planar circuits in microstrip and stripline technology, modifying the characteristics of the material and the geometry of the substrate in order to improve the performance of the circuits.
The fourth chapter presents the design and the manufacturing method of various band-pass filters in a multilayer structure and the implementation of a diplexer using this technology, in order to achieve better performance, compared to traditional circuits manufacturing technologies.
In the fifth chapter, the design and manufacturing process of a novel waveguide band-pass filter is presented using periodic structures.
The sixth chapter describes the overall conclusions that have been reached in this doctoral thesis and several research directions are proposed to develop new projects and future contributions.
Finally, the doctoral thesis concludes with an annex that includes the main articles written during this project.
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