Wireless power transfer and applications for IOT technology

In this thesis, comprehensive research has been conducted on metamaterial-based absorber structures and voltage rectifier circuits, which play a crucial role in wireless power transfer within IoT technologies. Within the scope of the research, metamaterial-based absorbers with different designs that provide excellent absorption independent of polarization and incidence angles have been designed. After harvesting the radiofrequency energy in the environment with metamaterial absorbing structures, voltage rectifier circuits are modeled to convert this energy into usable direct current. In this thesis, it is aimed to realize voltage rectifier circuit designs developed using different methods with metamaterial absorber structures with resonance at different frequencies for wireless power transfer to low-power electronic devices for use in IoT applications. In this thesis, a total of seven structure designs are presented in four parts. The first part consists of a metamaterial signal absorber structure with high absorption characteristics that resonates at IoT frequency and a half-wave voltage rectifier circuit. The second part consists of a metamaterial signal absorber structure with high signal absorption independency of polarization and incidence angles at 2,4 GHz, which is also the IoT frequency, and a voltage doubler circuit to convert radiofrequency power into direct current power. In the third part, a metamaterial signal absorber resonant at dual frequency and a voltage doubler circuit are designed. In the last section, a dual-band voltage rectifier circuit with a double-branch structure and T-type matching circuit method is designed and analyzed. The studies consist of a total of seven different structures and the numerical and experimental results of each study are analyzed.