A low-profile circular microstrip antenna with recessed ground

This work proposes a circular microstrip antenna with a low profile that uses recessed ground to shift the resonant band. The antenna design has a square-shaped substrate and ground plane, paired with a circular radiating patch. A square-shaped portion of the substrate has been cut out ensued the shifting of the resonant band. The designed antenna can be used for WiMAX (3.3-3.4 GHz) application band. The overall resonant bandwidth of the antenna for ($S_{11}\leq-10\mathrm{~dB}$) is 160 MHz 4.8% with a frequency range (3.27-3.43 GHz). The antenna’s gain is 5.35dB at 3.35 GHz and essentially stays constant throughout the resonant bandwidth. HFSS veri3 simulation software and theoretical calculations has been used to complete the antenna design.