The design of multiband microstrip rectenna for radio frequency energy harvesting\napplications is presented in this paper. The designed antenna has\ngood performance in the GSM-900/1800, WiFi and WLAN bands. In addition,\nthe rectifier circuit is designed at multi resonant frequencies to collect\nthe largest amount of RF ambient power from different RF sources. The developed\nantenna is matched with the rectifier at four desired frequencies using\nseveral rectifier branches to collect the largest of RF power. The proposed\nrectenna is printed on FR4 substrate with modified ground plane to achieve\nsuitable impedance bandwidth. The proposed antenna consists of elliptical\nradiating plane with stubs and stepped modified ground plane. The rectenna\nresonates at quad frequency bands at (GSM 900/1800, WiFi band and WLAN\nbands) with rectifier power conversion efficiency up to 56.4% at 0 dBm input\npower using the HSMS-2850 Schottky diode. The efficiency is more enhanced\nby using SMS-7630-061 Schottky diode which is characterized by a low junction\ncapacitance and a low threshold voltage to achieve higher conversion efficiency\nup to 71.1% at the same 0 dBm input power for the same resonating\nfrequency band.
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