A Novel Design of Low Power Rectenna for Wireless Sensor and RFID Applications

摘要

In this paper, an efficient microstrip rectenna operating on ISM band with high harmonic rejection is presented. By using rotated E-shaped strip in the radiating patch, a new resonance at lower frequencies (2.4 GHz) can be achieved. Also by embedding cutting a rectangular slot with protruded interdigital strip inside the slot in the feed line a frequency band-stop performance can be achieved. The proposed structure has a major advantage in high harmonic rejection. The rectenna with integrated monopole antenna can eliminate the need for an low pass filter placed between the antenna and the diode as well as produce higher output power, with maximum conversion efficiency of 74% using a 1 KΩ load resistor at a power density of 0.3 mW/cm~2.