Tri-Band Two Rings Antenna Loaded with Inter-Digital Capacitor for Fifth Generation Applications

For fifth-generation applications, a tri-band antenna loaded with an inter-digital capacitor is suggested in this study. The antenna consists of two hexagonal rings connected to a capacitor and a partially rectangular ground plane, which is fed by a 50 Ohm microstrip transmission line. The tri-band characteristics of the antenna are achieved through the combination of the capacitor design and the hexagonal patch on the ground plane, which alters the current flow. The suggested antenna has dimensions of 7.6 x 10.5 x 0.8 mm³ and is constructed on a Roger 5880 substrate with a height of 0.8 mm, a relative dielectric constant of 2.2, and a loss tangent of 0.0009. The findings of the study demonstrate that the antenna exhibits three bandwidths suitable for 5G applications. These include bandwidths of 3.5 GHz (12.7% from 25.8 GHz to 29.3 GHz), 4.6 GHz (11.7% from 36.9 GHz to 41.5 GHz), and 14.3 GHz (25.3% from 49.3 GHz to 63.6 GHz). The antenna achieves resonance frequencies of 28 GHz, 38 GHz, and 60 GHz for these three respective bandwidths. Moreover, the suggested compact antenna demonstrates reasonable gain and an omnidirectional radiating pattern, making it suitable for use in mobile handsets.