Dual polarization inset-fed microstrip patch antenna

Abstract

This paper present design 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 oriented at desired location. Combinations of two and more patches using quarter-wave impedance matching technique has been used to designs the array antennas operate at 2.4 GHz. The designs were simulated using Microwave Office 2006 and were fabricated on FR4 substrate with a dielectric constant Er =4.7, tan a =0.019 and thickness =1.6mm. The simulation and measurement results have been compared. The designs of 1x2, 1x4 and 2x2 array antennas yield a bandwidth of 5%, return loss <-10dB. For the measurement setup of radiation pattern, the reference of transmitter is using monopole antenna. In this situation, the two planes are considered here at an element plane location 45?? and -45??. The element plane designates E-plane for location 45?? and H-plane for location -45??. The cross-polarization for both elements is perpendicular to the others. The gain of the single element antenna almost 4.21 dBi, and the gain of 1x2 arrays is 7.51 dBi. By designing more patch, which is 2x2 and 1x4 array antennas, the enhancement of gain is achieved were 8.734 dBi and 7.944 dBi, respectively. Finally, the result showed that the combination of more patches in array can improve the performance of antenna gain.