• Título:  MULTIBAND AND SILICON INTEGRATED ANTENNAS FOR WIRELESS SENSOR NETWORKS
• Autor:  Gemio Valero, Joan
• Universidad:  Universidad Autónoma de Barcelona
• Departamento:  TELECOMUNIACION E INGENIERIA DE SISTEMAS
• Fecha de Lectura:  20/07/2011
• Programa de doctorado:  Telecomunicación e ingeniería de Sistemas
• Dirección: 
  • PARRÓN GRANADOS, JOSEP (DIRECTOR)
• Tribunal: 
  • ROMEU ROBERT, JORDI (PRESIDENTE)
  • Anguera Pros, Jaume (SECRETARIO)
  • Segovia Vargas, Daniel (VOCAL)
• Descriptores: 
  • ANTENAS
  • RADIOCOMUNICACIONES
  • TECNOLOGIA DE LAS TELECOMUNICACIONES
  • RADIOONDAS Y MICROONDAS
• Localización:  BIBLIOTECA DE COMUNICACIÓN Y HEMEROTECA GENERAL UAB
• 2011gemiomulti.pdf
• Resumen:
  Wireless technologies have triggered an important revolution in the world of telecommunication networks and services. New systems, such as the latest generation of mobile phone systems or wireless LANs, have appeared being enthusiastically accepted by people. In particular, applications related to remote sensor networks are growing rapidly (for temperature monitoring, the detection of free parking spaces etc.). This thesis is focused on antenna design for distributed wireless sensor networks. The remote sensors we are considering are connected to a central unit using a wireless link in the 5.8 GHz ISM band and the central unit transmits the collected information to the Internet via a WLAN connection. In the central unit multiband antennas are necessary to cover several frequency bands with a single radiating element. Two solutions to obtain this multiband performance are proposed: fractal-based ground planes and resonator loaded monopoles. Several novel antennas that easily meet the system requirements are manufactured and measured, resulting in guidelines for the design process. For remote sensors small dimensions and low costs are desired. The use of silicon integrated antennas fabricated with standard CMOS technology is a good choice to achieve these requirements. First, the main problems of antenna integration are discussed and, then a possible solution to improve the antenna efficiency is presented together with a study of the effects of other elements integrated in the same chip with the antenna. The measurements of the manufactured prototypes demonstrate that antenna integration at 5.8 GHz is feasible, and that system ranges of some meters can be obtained even when the antenna is fabricated together with other elements integrated in the same chip. The possibility of having some of the sensors implanted inside the body will be a reality in the near future, for this reason the particular case of implanted antennas is also analyzed. The last part of this thesis is devoted to study the body effects on antenna performance and evaluate the additional propagation losses introduced by the body tissues.