The topic of my thesis was the analysis of phase difference measurements between antenna elements using analog approach in which I had to design a system based on a common superheterodyne receiver, which consists of only analog components and is capable of operating in a specific frequency range used by Bluetooth Low Energy. It was prerequisite for the implemented receiver to produce DC signals from which the phase difference information between the two antennas can be extracted and easily calculated.
At first, I needed to deepen my knowledge of the common superheterodyne receiver technique and its important units, then my task was to design a receiver unit based on the principles mentioned earlier and to display the crucial points of the system. I needed to create the simulation model of my preferred layout and run it on various cases, then evaluate their results. Finally, I had to prove the practical operability of the implemented system by means of real measurements.
Furthermore, I had to examine that what kind of unexploited possibilities could be achieved using prefilter based on microstrip technology, if it has the appropriate quality factor.