A Bandwidth Enhanced Circular Ring Microstrip Antenna Based on CSRR-loaded Ground for 5G Application

The development of 5G technology requires antennas that can support multiple services that require high data rates and low latency. A microstrip antenna with the characteristics of easy to manufacture and lightweight is suitable to meet these requirements. However, to support high data rates, it is necessary to increase the bandwidth of microstrip antennas, which usually have narrow bandwidth properties. The method used to increase the bandwidth of the microstrip antenna using a 1×2 configuration Complementary Split Ring Resonator (CSRR) on the ground plane has been investigated in this paper. The proposed antenna uses a circular ring patch and is designed on FR-4 material. From the unit cell simulation results, negative permittivity values are obtained in the frequency range 3.35 - 4 GHz or with a bandwidth of 650 MHz. The antenna simulation results show that by adding a CSRR with a 1×2 configuration, there is an increase in fractional bandwidth of 15.14% from 120 MHz to 650 MHz, compared to an antenna without a CSRR. The fabrication result bandwidth conforms with the simulation results with a bandwidth of 640 MHz. In addition, the radiation parameters from the measurement results show that the antenna has a gain of 4.9 dBi, and the radiation pattern is unidirectional.