Differential topology rectifier design for ambient wireless energy harvesting

In this paper, two types of differential topology rectifier are studied and designed for RF energy harvesting at GSM1800 band 1.83GHz. The proposed differential serial rectifier and differential doubler rectifier are with odd harmonics suppression characteristics. Radial stubs are utilized to filter the output harmonics, which makes the rectifier more compact. The rectifiers with Schottky diodes (SMS7630) are fabricated on Teflon substrate. Measured maximum efficiencies of two rectifiers are 49% @ 0dBm and 53% @ 2dBm, respectively. The results show that the rectifiers are efficient, power sensitive and compact. An application scenario of proposed rectifier are demonstrated. The proposed rectifiers can be used in many RF energy harvesting system, including RFID applications.