Dual polarization microstrip patch array antenna

This paper present 3 designs of array antenna from type of inset-fed microstrip patch antenna oriented at 45deg and -45deg. The antennas are capable to generate dual-polarization radiation pattern centered at 45deg and -45deg. 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 epsiv_r =4.7, tan sigma =0.019 and thickness =1.6 mm. The simulation and measurement result have been compared. The 3 design 1 times 2 array antennas yield a bandwidth greater than 5%. The gain of the proposed antennas is also stable with operated frequency. The average is achieved 20 dBi for 1 times 4 and 2 times 2 array antenna and 9.5 dBi for 1 times 2 array antenna. The result showed that the combination of more patches in array can improve the return loss and antenna gain performances.