Taper-walled linearly tapered slot antenna: A low direct-coupling antenna for subsurface imaging

Ground penetrating radars attract attention of many researchers as a new technique to visualize antipersonnel plastic landmines. Previously we proposed a high-density and wideband array that realizes high-resolution and quick imaging. However, the high-density array sometimes suffers from direct coupling among antenna elements, which decreases the performance of the landmine detection. In this paper, we propose a new antenna element employing open slits and tapered aperture to decrease the direct coupling.