Design of symmetrical stepped slots loaded quad band antenna

This paper presents a symmetrical stepped slots loaded circular patch antenna for multiple wireless services. The proposed quad band antenna designed to work at 1.55 GHz, 2.8 GHz, 3.6 GHz and 4.8 GHz frequency band to cover GSM II, WiMAX and C-band applications. The proposed quad band antenna is designed in low-cost FR4 substrate and simulated using High Frequency Structure Simulator (HFSS), that is the Finite Element Method (FEM) based software package. The size of the proposed quad band antenna is smaller than that of a conventional antenna designed for lowest operating frequency and out-of-band interference is diminished in this design. The optimized dimension of the antenna is 50 × 50 mm
²
with 1.6 mm thickness. The simulated results of the proposed antenna such as S
₁₁
-parameter, surface current distribution, VSWR, input impedance and radiation pattern has better performance and is presented in the following sections.