Antenna diversity with opportunistic combining

Sammanfattning: In modern telecommunication technologies, the requirement for signal reliability is higher and higher but fading is the main challenge for signal reliability. Different types of techniques have been studied to mitigate this fading but MIMO (Multiple Input Multiple Output) has been studied extensively in wireless communication systems to overcome small-scale fading, which is an efficient way to improve signal-to-noise and bit error rates. In this thesis, all works were operated at 2.45 GHz. Planar-Inverted F antenna (PIFA) is used for mobile phone due to its low profile and high gain. In this thesis, two PIFAs are used for antenna diversity. All the simulation of the antennas was performed in High Frequency Structure Simulator (HFSS). Advanced Design system (ADS) is used for Wilkinson combiner design and simulation and overall layout design for PCB fabrication. Phase shifters are used to change the phase of each input signals. All measurements have been done in both reverberation chamber and office environment and the two results are different. Office environment measurements have been done in PCB lab at Linköping University and reverberation measurements have been done at SP Technical Research Institute of Sweden. Finally a conclusion was drawn about the performance of this thesis.