Rectenna Array Design for Wireless Power Transmission

Abstract

With the growing concern about the Earth’s energy problems, the discovery of new en- ergy sources and new energy transmission methods to collect inexhaustible solar energy has become a key research field for future energy shortages. Existing wireless power transmission systems have been used in fields ranging from radio frequency identification to micro-systems. The rectenna, as the receiving end, affects the power transmission and conversion efficiency of the entire system and is one of the key technologies. Hence the indispensability of its in-depth research and discussion. In this thesis, an H-shaped slot-coupled antenna and subsequent rectifier circuit is designed and analyzed. The specific design and analysis of the receiving antenna is explained. The analysis and simulations are performed from various aspects such as frequency selection, dielectric substrate selection, coupling mode selection. After that, the design of the rectifier circuit is presented. Based on the existing technology and recent developments on rectifier circuits, the selection basis for the rectifier diode is analyzed. Then a receiver antenna with working frequency of 2.45 GHz is designed to meet its input. The high- efficiency rectifier circuit with impedance matching can achieve rectifying efficiency up to 86.6% when the input power is 10dBm, in the frequency band centered at 2.45GHz. Finally, the antenna is combined with the subsequent rectifier circuit to analyze the over- all structure of the rectenna. According to the Friis transmission equation and some com- monly used parameters, the specific dimensions of the antenna are calculated to satisfy the maximum rectifying efficiency of the circuit, and a rectenna array is designed and analyzed.