Additive Manufacturing of Flexible Rectenna Abstract: This work demonstrates the use of high resolution, additive manufacturing of functional materials to produce a functional flexible rectenna prototype that receives power at RF frequencies and rectifies the power to DC. The rectenna is composed of an antenna, on-board interconnects, RF rectifier, and an LED output indicator. All interconnects are printed using EHDIJ (electrohydrodynamic inkjet). The viability of using EHDIJ as an additive manufacturing method for creating RF circuitry operating at GHz range with various substrates ranging from commercially available PCB materials to next generation materials such as ribbon ceramics is confirmed. In addition, multiple types of ink, including silver and copper nanoparticle inks, were used to demonstrate compatibility of interconnect features printed from these materials with soldering and die attaching, which are processes that already exist in the electronics industry. The functional prototype demonstrates the potential in utilizing this technology to achieve chip level fan out, high frequency operation, and energy harvesting for commercial applications on flexible substrates by integrating an antenna and an RF rectifier (NFW330 from NoiseFigure Research) on the same flexible substrate using additive manufacturing techniques.