Performance improvement of slot antenna with metamaterial for modern wireless communication
Maitree Tamma, Apidach Boonjue, Witchupong Wiboonjaroen, Sanchai Ramphueiphad, Saran Kampeephat
Abstract
A slot antenna has been widely used for multifunction in modern wireless communication technologies such as WLAN, WiMAX, IoT, and GSM. Generally, slot antennas can operate in wideband. Nevertheless, this antenna type was limited in terms of lower gain because of wideband operation. Therefore, this paper presents a slot antenna designed for operation frequencies between 1.8 GHz and 6.5 GHz and a study of the performance improvement of slot antennas with metamaterials to increase antenna quality. The utilization of metamaterials can improve the performance of slot antennas by increasing gain levels, reducing sidelobe levels, and optimizing reflection coefficients (S11). As a result, determine the metallic hole structure and wire medium structure put behind the slot antenna for comparing performance. All of them act like reflectors for reflected radiation from the back to the front, which improved the average gain of all operating frequencies from 3.41 dBi to 7.33 dBi for metallic hole structure and 7.42 dBi for wire medium structure. Moreover, the simulation and measurement gave great results. These proposed metamaterials provided enhanced gain and reduced sidelobe level.