Dissertação de mest., Engenharia Eléctrica e Telecomunicações, Faculdade de Ciências e Tecnologia, Univ. do Algarve, 2010The need for networks able of integrating services such as voice, video, data and mobility is growing. To satisfy such needs wireless networks with a high data transmission capacity are required.
An efficient solution for these broadband wireless networks is to transmit radio signals to the Base Stations (BS) via optical fiber using Wavelength Division Multiplexing (WDM). The WDM usage helps this growing, allowing the use of a single optical fiber to feed several BSs using for each one a different wavelength (or WDM channel). Additionally, in the RoFnet project in order to improve radio coverage within a cell, it is considered a sectorized antenna interface. The combination of subcarrier multiplexing (SCM) with WDM, further simplifies the network architecture, by using a specific wavelength channel to feed an individual BS and different subcarriers to drive the individual antenna sectors within the BS.
This dissertation reports the design and simulation of the microstrip bandpass filters used at the BS on of the RoFnet demonstrator. These bandpass filters are used for the filtering of fours subcarrier multiplexed channels located at (9, 11, 13, 15 and 17 GHz). The design and simulation of the lowpass root raised cosine filter required for testing is also discussed. Additionally, the design and testing of two power splitter is reported. Finally, all the designed components were brought together and the overall BS performance is assessed.
The microstrip components have been designed and simulated using both ADS (Agilent’s Advanced Design System) and Momentum simulators
