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Quad-Band Rectenna for RF Energy Harvesting System

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Document pages: 14 pages

Abstract: This paper introduces the design of multi band microstrip rectifier antenna for RF energy collection. The designed antenna has good performance in GSM-900 1800, WiFi and WLAN bands. In addition, the rectifier circuit is designed with multiple resonant frequencies to collect the maximum RF ambient power from different RF sources. The developed antenna is matched with the rectifier at four desired frequencies, and multiple rectifier branches are used to collect the maximum RF power. In order to obtain appropriate impedance bandwidth, the proposed rectifier antenna is printed on FR4 substrate and modified. The antenna consists of an elliptical radiation surface with a stub and a stepped modified ground plane. Rectangular antenna in four frequency bands (GSM 900 1800, wFi band and WLAN bands) with rectifier power conversion efficiency up to 56.4 at 0 dBm input power using the HSMS-2850 Schottky diode. The efficiency is more enhanced by using SMS-7630-061 Schottky diode which is characterized by a low junction capacitance and a low threshold voltage to achieve higher conversion efficiency up to 71.1 at the same 0 dBm input power for the same resonating frequency band.

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