STUDY ON AN S-BAND RECTENNA ARRAY FOR WIRELESS MICROWAVE POWER TRANSMISSION

Abstract

The microwave power transmission is an approach for wireless power transmission. As an important component of a microwave wireless power transmission systems, microwave rectennas are widely studied. A rectenna based on a microstrip dipole antenna and a microwave rectifler with high conversion e-ciency were designed at 2.45GHz. The dipole antenna achieved a gain of 5.2dBi, a return loss greater than 10dB, and a bandwidth of 20%. The microwave to DC (MW-DC) conversion e-ciency of the rectifler was measured as 83% with 20dBm input power and 600› load. There are 72 rectennas to form an array with an area of 50cm by 50cm. The measured results show that the arrangement of the rectenna connection is an efiective way to improve the total conversion e-ciency, when the microwave power distribution is not uniform on rectenna array. The experimental results show that the highest microwave power transmission e-ciency reaches 67.6%.