Elliptical metasurface cloaks in printed technology — Reduction of mutual coupling in closely spaced planar antennas

In this paper, we propose a novel approach based on the mantle cloaking method to reduce the mutual coupling between closely spaced planar antennas. We consider two microstrip-fed monopole antennas resonating at slightly different frequencies and show that by covering each antenna with a conformal elliptical metasurface formed by conformal and confocal printed arrays of sub-wavelength periodic elements, the antennas become invisible to each other and their radiation patterns are restored as if they were isolated.