Characteristic of Circular Patch Antennas Using Open and Close Metal Rings on Artificial Dielectric Materials

This study explores the characteristics of circular patch antennas. If the patch antenna generally uses natural dielectric material, the proposed circular patch antenna uses artificial dielectric material. The dielectric properties of natural materials have been modified by adding metallic layers in open and closed rings of one and two layers. This study is based on simulation results using the CST Suites Studio. Simulations were carried out at a frequency of 3.3 - 3.7 GHz on the Lucite substrate. The substrate has a relative permittivity of 3.4 and a thickness of 1.5 mm. Based on the simulation, it is obtained that a circular patch antenna with two strips of open ring metal has the widest bandwidth of 196 MHz for a return loss greater than 10 dB and the highest gain of 6.4 dBi. In addition, open ring metal has the potential to miniaturize the circular patch antenna size by up to 32.08%.