The Internet of Things is extending connectivity to more and more devices. Wireless is expanding beyond smartphones, laptops, and smart speakers and becoming an essential component of products like light bulbs, thermostats, door locks, and doorbells. Data traffic over wireless networks has multiplied over the last decade, driven by the growth of streaming services and applications like social networking. In this context where wireless Radio Frequency (RF) activity is more and more pervasive and abundant, recycling the RF energy that surrounds us wherever we go, energy that would not otherwise be used, is appealing because of its simplicity, economy, and sustainability. With RF activity continuously growing as more and more device become connected, this builds the foundation for a self-sustaining source of power allowing many more products to transmit useful information about themselves and the way consumers interact with them.