High-density array antenna with unevenly arranged parasitic elements for large-scale DC rectenna arrays

Abstract

This letter proposes a high-density array antenna loaded with unevenly arranged parasitic elements to realize compact and high-power DC rectenna arrays. By adjusting the positions of the parasitic elements loaded above a high-density array antenna, the beam of each antenna element is directed to the front of the array antenna. Hence, the reception performance of the whole array antenna is improved. The aperture ratio, which is defined as a ratio of an effective aperture area and physical area, is examined by simulation and experiment for a 9-element array antenna. The aperture ratio of 1.88 is achieved.