Side Lobe Suppression of Marine-Radar Linear Array Antenna by a Reflectionless Metasurface

This paper demonstrates a side lobe suppression technique of a marine radar linear slot array antenna by a reflectionless metasurface. The metasurface introduces position-dependent phase shifts so that the phase across the entire aperture can be uniform. It is numerically shown that the metasurface drastically suppresses the maximum side lobe level at 9.41 GHz to be below -24 dB in both the E and H planes, and as a consequence, the peak gain of the main lobe is increased by 1.4 dB.