Dual polarized designs of square microstrip antenna for GSM and LTE applications

Abstract

SummaryTo obtain the polarization agility in wireless applications, the dual polarized wideband or multi‐band antennas are required. In this paper, modified designs of square microstrip antenna by employing overlap offset parasitic patches are proposed for the dual polarized wideband and multi‐band response. Due to the optimum spacing in between the fundamental TM1045 and TM01135 modes along with TM11 mode, on a total substrate thickness of 0.075λg, the proposed design yields bandwidth of more than 550 MHz (>50%), exhibiting the dual polarized characteristics. A similar design is presented on a thinner suspended substrate. Here, on the substrate thickness of 0.035λg, it yields impedance matching at higher order TM20 mode, which along with TM1045, TM01135, and TM11 modes exhibits triple band response. An impedance bandwidth of 3.4%, 17%, and 4.7% is realized in the three bands with a broadside gain of more than 6 dBi. The proposed design satisfies the requirements of GSM 810/GSM900/LTE applications. In each design, simulated results have been experimentally verified that show close agreement.