{"id":95901,"date":"2018-03-11T10:15:59","date_gmt":"2018-03-11T10:15:59","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/circuitos-de-microondas-uniplanares-multimodales-reconfigurables\/"},"modified":"2018-03-11T10:15:59","modified_gmt":"2018-03-11T10:15:59","slug":"circuitos-de-microondas-uniplanares-multimodales-reconfigurables","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/politecnica-de-catalunya\/circuitos-de-microondas-uniplanares-multimodales-reconfigurables\/","title":{"rendered":"Circuitos de microondas uniplanares multimodales, reconfigurables"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Marco Antonio Llamas Morote <\/strong><\/h2>\n<p>The complexity of high-frequency systems is increasing every day as a consequence  of the required performances. This is the case for scientific instruments which are part  of satellite payloads and require high precision and resolution. Other requirements have  to be added to the electrical performances of the system, such as low power  consumption, weight and cost. In this context, the classical design methodologies have  to be substituted in order to reach these new set of specifications. One way to proceed is  to develop new design techniques and technologies.  this thesis proposes to use the different modes that can be propagated in uniplanar  transmission lines (cpw even and odd modes, and slotline mode). To enable a  systematic procedure for circuit analysis and design, accurate multimodal models are  used which take into account all the modal interactions and separates the cpw even and  odd modes. As a result, an alternative design method to achieve more compact and  broadband high-frequency circuits is proposed. Multimodal models provide insight into  cpw circuits under general even- and odd-mode excitations, and understanding of their  response to arbitrary loading conditions (which can in general be different for the even  and odd modes). When available, they constitute a reasonable alternative, from a circuit  point of view, to the more time-consuming full wave em.  in order to design the multimodal uniplanar circuits proposed in this thesis, it is  necessary to understand each of the different types of transmission lines used and their  different propagation modes. In this work, modelling of different uniplanar transmission  lines (cpw and slotline transmission lines) is presented from a multimodal point of  view.  another important added value in high-frequency circuits is reconfigurability. Rf- mems (microelectromechanical systems) technology has demonstrated a great  potential for reconfigurability purposes, especially at microwave and millimetre bands.  the reconfigurability of some of the circuits proposed in this thesis will be done by  means of rf-mems switches. However, the electrical  modelling of rf-mems  switches poses new challenges. Indeed, the switch electrical performance is coupled to  the mechanical properties of the structures and materials involved in its implementation  and also to the fabrication process technology. Furthermore, although rf-mems  switches are 3d structures, they can also be considered 2.5d structures due to their very  high aspect ratio. Electrical modelling can then be addressed by a great variety of 3d or  2.5d em simulation tools. This work proposes different strategies for the electrical  modelling of capacitive and resistive rf-mems switches which take into account the  dependence of the device electrical performance on  the mechanical properties and  technological processes.  finally, a number of uniplanar multimodal reconfigurable circuits, based on the  techniques previously developed, are proposed, designed and characterized. More  specifically, a number of new topologies to implement two different applications are  developed: 180\u00c2\u00ba hybrids and 0\u00c2\u00ba\/180\u00c2\u00ba phase switches. The circuits are presented along  with their design procedure (based on circuital multimodal models). The final goal is to  demonstrate that using both multimodal design techniques and rf-mems technology it  is possible to implement high-frequency circuits with advanced performances. The  proposed circuits have low power consumption, low insertion loss and a high degree of  miniaturization (mainly due to the characteristics  of rf mems switches). Using the  multimodal property of uniplanar transmission lines, the proposed structures result also  more compact and broadband, especially in terms of  phase.  The designed circuits  feature similar or better results than the state of the art.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Circuitos de microondas uniplanares multimodales, reconfigurables<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Circuitos de microondas uniplanares multimodales, reconfigurables <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Marco Antonio Llamas Morote <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 14\/09\/2009<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>LLuis Pradell Cara<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: eduardo Artal latorre <\/li>\n<li>miquel Rib\u00f3 pal (vocal)<\/li>\n<li>Juan  mari Collantes metola (vocal)<\/li>\n<li>Antonio  ramon L\u00e1zaro guill\u00e9n (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Marco Antonio Llamas Morote The complexity of high-frequency systems is increasing every day as a consequence of 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