UWB integrated microstrip patch antenna with unsymmetrical opposite slots

A new ultra wide band (UWB) probe fed microstrip patch antenna (MPA) with two unsymmetrical opposite slots is proposed. In this paper, two opposite slots with dimensions L₁×W₁ and L₂×W₂ were entrenched in radiating edges of patch. The dielectric substrate has dimensions 100×100 mm² and optimized height of 4mm. A parametric study of slots dimensions, dielectric material type and substrate thickness has been carried out to enhance the impedance bandwidth of the proposed antenna. The antenna performance has been characterized in terms of reflection coefficient (S11) and radiation characteristics. Among different dielectric materials, FR4 epoxy with thickness of 4mm resulted in an impedance bandwidth of 4.8 to 10.6 GHz. The peak gain varies from 4.5 dB to 7.5 dB over the operating frequency range. The antenna was simulated using Ansys HFSS v13 based on Finite element method. This antenna is a suitable candidate for variety of UWB wireless and broadband applications.