Title: A UWB Rectenna System Using a Defective Ground Structure (DGS) Monopole Antenna for Ambient Energy Harvesting
Abstract: Abstract A new circularly polarized (CP), high-gain, high-efficiency rectifying antenna (rectenna) is designed in the compact ultrawideband (UWB) rectifier circuit presented in this work. The constant dc output voltage and the high conversion efficiency of the rectifier’s UWB capabilities can be achieved by using this feature. The new L-L input impedance matching is more stable over a wider input power range because an HSMS 2850 diode, biased in the opposite direction by the rectifier’s output voltage, cancels out the input power-induced instability. For validation, the proposed antenna and rectifier are fabricated and demonstrate the complete rectenna in indoor and outdoor environments. The experimental results show that the RF-DC power rectification efficiency maintains over 49.5% and 55% within the input power ranges of-20 to-10 dBm, and the corresponding measured indoor and outdoor output dc voltage are 429.8 and 463.1 mV, respectively. The new rectenna is realized using an EVM power module in an indoor environment which is able to generate 452.2 mV. The proposed rectenna system and new matching mechanisms can be used for various energy harvesting applications, especially for those requiring better supply voltage in an ambient environment.