Performance Enhancement of THz Antenna with Reduced Size of Graphene Metasurface Unit Cell Structure Array
Nipun Sharma, Amrit Kaur
Abstract
Objectives: To design a metasurface layer of graphene unit cells with reduced surface area by incorporating different geometry of unit cell. Methods: The metasurface layer in the form of unit cell array is traditionally made of very simple geometry like square unit cell to limit design complexity. However, if the unit cell structure geometry is changed to triangular shape, it reduces the total surface area of the metasurface layer, thereby saving the graphene material. The proposed design is not only reduces the size of the metasurface layer of THz antenna but also enhances the performance of the antenna. Findings: The single square unit cell structure has 337.46 µm2 area and an array of 9 x 9 such unit cells consume 27334.26 µm2area. On the other hand, a single triangular unit cell design is 123.94 µm2 and an array of 9 x 9 such unit cells consume only 10039.14 µm2 area which is a saving of 63.35 % metasurface material. Novelty: The proposed antenna design in the paper compares the existing designs for better bandwidth, better return loss and reduction in the total surface area utilized by the metasurface layer and delivers a better performance. Keywords: Microstrip Patch Antenna, Thz Antenna, Metasurface, Unit Cell Structure, Wide Band Antenna