2026-04-17T11:00:28Zhttps://recercat.cat/oai/request

oai:recercat.cat:2099.1/195572025-07-23T04:33:52Zcom_2072_1033col_2072_452951

Aplicación de pantallas magnéticas a la reducción de tamaño de un sistema multiantena Martín García, Adrián Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions González Arbesu, José Maria Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Antenes i agrupacions d'antenes Synthesis lectures on antennas Antenas Pantallas magnéticas In this project, the advantages and disadvantages provided by the inclusion of magnetic screens to decouple the different antennas that integrate a multi-antenna system will be studied. Metamaterials are introduced, being some of their possible uses and some applications (according to referenced papers) will be exposed. Specifically, a type of metamaterials will be explained: magnetic screens. The tools used for the design and simulation of multi-antenna structures involving these artificial materials will be commented. A multi-antenna system design based onm etamaterial separators will be designed in order to reduce the size of the multi-antenna structure keeping the isolation level between antenna elements. Firstly, a unit cell to be used in the magnetic screen will be analysed and designed. Next, a monopole will be tuned at an operating frequency of 2.45GHz. Secondly, two multi-antenna systems will be designed, a first having two monopoles and another one with four monopoles. These designs will be compared with the performance of: 1) a conventional system where the decoupling is achieved by the separating the antennas; 2) a system where the decoupling is achieved by the inclusion of a metal screen; and 3) a system that includes an artificial magnetic screen (metamaterial) composed with a periodic arrangement of a pre-designed unit cell. The parameters evaluated for comparison between the three types of decoupling systems are: reflection coefficient, isolation, and radiation pattern, all of them at frequency of 2.45 GHz because this frequency corresponds to a free band in the National Frequency Table and consequently this system may be used in Wi-Fi systems. The electrical sizes of the final designs having the artificial magnetic screen are compared with the multi-antenna systems without isolating screens. 2013-07-18 Bachelor thesis https://hdl.handle.net/2099.1/19557 spa http://creativecommons.org/licenses/by-nc-sa/3.0/es/ Restricted access - author's decision Attribution-NonCommercial-ShareAlike 3.0 Spain application/pdf Universitat Politècnica de Catalunya