Microstrip planar array antenna with improved DGS structure for multiband operation

The goal of this paper is to use defected ground structures (DGS) in microstrip planar array antenna for multiband band operation. The DGS structures are introduce to improve the performance of planar array antenna in terms of return loss, gain, directivity and voltage standing wave ratio. The array of two by two (2×2) planar array antenna with inset feed based on quarter wave impedance matching technique is designed and simulated using Computer Simulation Tool (CST) microwave environment software. The results of planar array antenna with and without DGS structures are also taken into account. The array antenna is designed on Rogers-4350 laminate having dielectric constant of 3.48 and thickness of 0.762mm, respectively. Further, the result show that the proposed array antenna with DGS structure has the gain of 8.742dB, directivity of 10.2dBi and the return loss of -17.8dB at 2.48GHz and -23.97dB at 2.658GHz and -22.3dB at 3.236GHz.