In a world where more and more wireless sensors are being applied, powering these sensors becomes an issue of concern. Cabling is often too expensive as is the use of primary batteries due to replacement and disposal problems. Energy harvesting from light, temperature gradients of vibration is not always possible. Then, wirelessly powering or charging batteries through far-field RF radiation is the only possibility left. The focus of the project is capturing RF radiation by a small or large aperture (antenna) and efficient rectifying the RF signals into usable DC power. Thereto the components of the rectifying antenna (rectenna) are modelled and the models are used to design efficient Wireless Power Transport systems.