Inductive wireless power transfer is defined as the electromagnetic energy transfer from a power source to an electrical load across an air gap without interconnecting cords. It is based on the inductive coupling between two or more resonator coils in order to transfer power. This thesis has investigated and proposed solutions to overcome this technology main limitations (e.g., efficiency decrease due to misalignment and the limited power transfer range). Specifically, it addresses the development of a MOSFET based switching impedance matching network as well as extending the horizontal wireless power transfer range through the implementation of passive resonators within the system. Firstly, regarding MOSFET based impedance matching networks, the MOSFET switch has been modelled analytically and analysed during its ‘on’ and ‘off’ operation. Based on the analytical model, multiple MOSFET switch pairs characterised by different operating parameters have been selected and tested experimentally, being implemented within the receiver’s impedance matching network. The analytical model of the wireless power transfer system was evaluated and compared with the experimental setup when each MOSFET switch pair was implemented. It has been concluded that MOSFET switches are a viable solution for impedance matching networks. The main design guideline consists of the MOSFET switch pair to be characterised by a low turn on parasitic resistance (within the milli-Ω range) and a low turn off parasitic capacitance (specifically as the system’s frequency operation is 200 kHz, a parasitic capacitance within the pF range is recommended). The second main focus of this thesis revolves around extending the horizontal transmission distance between a transmitter and a receiver wireless power transfer system. In this thesis, the horizontal transmission distance increase was investigated when passive base coils are introduced between the active transmitter and passive receiver. The first passive base coil design researched has been an elliptical coil topology. Its design was tailored to fit the transmitter and the receiver coils and optimised by taking into consideration general design guidelines proposed in literature. Moreover, as the base coil dimensions increased in order to expand the horizontal transmission distance, the optimum number of turns for each model was determined through an electromagnetic simulation software and experimentally. Overall, the best-performing elliptical base coils ensured that the wireless transfer efficiency between the transmitter-receiver reached values between 50% and 63%. The second passive coil design researched consists of a single turn passive base coil. The base coil was designed to match the transmitter and receiver coil dimensions and shape. In this analysis, the base coil was developed as a single turn coil since switching elements have been introduced within its topology. Prior to the addition of switching elements, the base coil design was optimised and tested for different track depths and widths. Furthermore, the concept of track-splitting as an optimisation technique was investigated. Once the optimum design parameters have been established (leading to transmitter-receiver wireless transfer efficiency range between 25% to 34%), the implementation of switching elements was undertaken, specifically MOSFET and electromechanical relays switches. The switches are integrated within the coil’s topology, in the middle between the transmitter and receiver designated areas. The two switching options have been implemented during the ‘on’ operation. A feasibility study was carried out, concluding that through MOSFET switches the maximum achievable efficiency is 18% whereas for electromechanical relays is 22%. It is concluded that although the introduced parasitic resistance of the switching elements is within the milli-Ohm range, its effect cannot be compensated by impedance matching networks since it introduces an ohmic loss. Moreover, it is concluded that switching elements in coil design are more suitable for implementation in coil-structures where the switch is located at the coil’s terminals and does not interfere with its topology.