Multiband Microstrip Antenna Inspired by Metasurface

Using metamaterial unit cell, a homogeneous artificial structure can be formed, these two dimensional structure is called as Metasurface. Microstrip Patch antennas (MPA) are known for their smaller size, lesser weight, easier for fabrication, and low fabrication cost. But they have narrow bandwidth. A simple MPA was considered which resonate at 8.6GHz with return loss of -24.81dB, bandwidth of 530MHz.Introduced a metasurface array of size 5X5 which resonate at 8.5GHz along with MPA to study its effects. With the addition of the metasurface, the MPA resonate with dual bands at 8.1GHz and 14.7GHz with improved bandwidth from 530MHz to 1590MHz. Three different metasurfaces were proposed and it has been observed that there is slight difference in the gain for three structures. For circular shape metasurface gain at 8.1GHz is 8dBi, at 14.7GHz is 5.4dBi. For Square shape metasurface gain at 8.1GHz is 7.7dBi, at 14.7GHz is 5.3dBi and for plus shape metasurface gain at 8.1GHz is 6.7dBi, at 14.7GHz is 5.7dBi.