Open-loop dipole microstrip antenna with U-shape insertion for 2.45 GHz wireless applications

In this article, two structures of open-loop dipole microstrip antenna for 2.45 GHz wireless applications were investigated through numerical simulation and experiment. The characteristic impedance of the open-loop was 430 Ω Both microstrip antennas substrate use FR-4 with1.6 mm thickness and 4.3 of relative permittivity. The whole dimensions were 85 mm x 95 mm x 1.6 mm. The differences between the two microstrip antenna structures were indicated by using Ushape inside the loop and without using U-shape. The U-shape inserted into the open-loop microstrip could improve the gain. Both results of the simulation and the measurement showed that the gain was increased from (3.6-3.7) dB to (4.3-5.5) dB at frequency 2.45 GHz with the return loss around -20 dB.