The purpose of this thesis is to design and test a device that measures the electrical parameter sofa certain material. This device can have different applications, like assisting in land mines detection, agricultural or construction purposes. In order to measure the electrical parameters, this device or probe uses two wideband planar dipole antennas that operate in the frequency range between 3 and 6 GHz. The transmitted signal between the antennas, (S21), is measured and then compared to a database obtained by simulating different materials using the Finite Difference Time Domain Method. Based ...

This thesis aimed to study the structure of an on grid photovoltaic system and to get by the aspect of integration of such system to the power network. The integration method can have different topologies and is usually based on power electronic devices controlled by dedicated controllers. In order to transform the direct output signal of the PV panels to an alternative signal connected to the utility network, the Modular Multilevel Converter (MMC) was used in this study. The challenges linked to this type of converters are associated with its sub-modules balancing control, the ...