Inkjet-Printing Technology provides the ability of fabricating electronic circuits on different substrates such as: cardboard, wood, kapton and etc. The advantages of this technology are reduction in production cost in comparison to conventional laminate substrates and also being environmentally-friendly circuits which is one of the main goals in any manufacturing field. Having environmentally-friendly and low cost productions are possible by utilizing paper as the substrate and Inkjet-printing as the fabrication technology.
In addition, reducing the power consumption in any circuit is an important factor in designing a circuit. In any wireless portable device, usage of battery causes a limitation in application space and decreases the lifetime of devices .Since increasing the lifetime of battery is still infeasible, power harvesting energy is one of the solutions in designing battery-less circuits. Power harvesting is a process by which energy is delivered by scavenging DC power from ambient sources. The ambient sources for power harvesting can be light, temperature, motion and electromagnetic in RF (Radio Frequency) range.
Among all these sources, ambient RF energy, in both indoor and outdoor is generally available in all hours at different frequency bands. Hence RF energy harvesting is one the most popular type of power harvesting. The ambient RF sources are: Wi-Fi transceivers,AM/FM radio, television broadcasting, mobile networks and communication devices.
In this Project, experimental investigations on the inkjet-printed RF power harvester for 2.4GHz are presented. An one stage discrete rectifier based on a voltage doubler structure and a planar monopole antenna are fabricated on cardboard using inkjet printing.The performance of the whole system is examined by measuring the output voltage of the RF power harvester. By the utilization of the proposed idea, the fabrication of low cost Environmental-friendly battery-less wireless modules is conceivabl
