Dual polarization microstrip patch array antenna

This paper present 3 designs of array antenna from type of inset-fed microstrip patch antenna oriented at 45° and −45°. The antennas are capable to generate dual-polarization radiation pattern centered at 45° and −45°. Combinations of two patches using quarter-wave impedance matching technique has been used to designs the array antennas operate at 2.4 GHz. The designs are simulated using Microwave Office 2004 and were fabricated on FR4 substrate with a dielectric constant ε
r
=4.7, tan σ =0.019 and thickness =1.6mm. The simulation and measurement result have been compared. The 3 design 1x2 array antennas yield a bandwidth grater than 5%. The gain of the proposed antennas is also stable with operated frequency. The average is achieved 20 dBi for 1x4 and 2x2 array antenna and 9.5 dBi for 1×2 array antenna. The result showed that the combination of more patches in array can improve the return loss and antenna gain performances.