DC-pass filter conception for CPW rectenna design

In this paper the challenging coplanar waveguide DC-pass filter is designed, analysed, fabricated and measured. As the ground plane and the conductive line are etched on the same plane, this technology allows the connection of series and shunt elements to the active devices without via holes through the substrate; however the parasitic effects are inevitable. Indeed, this study presents the first step in the optimization of a rectenna: key element of an RF energy harvesting system. The measurement of the proposed filter show good performances in the rejection of F₀=2.45 GHz and F₁=4.9 GHz. Additionally, the maximum RF-to-DC conversion efficiency of 32% was successfully achieved in HB simulation with the realized DC-pass filter for an input power of 10 μW at 2.45 GHz.