A Low-profile Wideband Pattern Reconfigurable Antenna with Metasurface

This paper presents a pattern reconfigurable antenna with low-profile and wide bandwidth. The antenna is composed of a patch layer, a metasurface (MS) layer, and a full ground plane. The radiation patch consists of a microstrip-fed square and three parasitic patches. The MS with 4×4 units is added on the top of the patch layer to improve bandwidth as well as tune radiation pattern. Ten of the MS units are available to connect with the ground plane, each of which is loaded with a PIN diode to control the shorting state, providing 12 beam states with reconfigurable beams between ±5∘ to ±15∘ both in xoz and yoz planes. The proposed antenna has been fabricated and measured. Measurement shows that the antenna has a wide impedance bandwidth of 4.02-5.72 GHz, a beam scanning range of -16∘-15∘ in xoz plane and -13∘-15∘ in yoz plane, peak gain range of 4.94-6 dBi. With a planar shape of low profile and full ground plane, the antenna design is a good candidate to be applied in wireless communication systems with conductive surface.