In this paper, an investigation is carried out on the effect of diagonal slit introduced on the rectangular patch antenna to obtain dual-band operation by simulating on High-Frequency Structure Simulator. Initially, a rectangular patch by microstrip line feeding technique is designed with the help of standard equations at the resonant frequency of 2.4 GHz. Later on, a slit of width 80 μm is introduced diagonally, with an inclination of 45° along the length of the patch and simulations has been carried out for different slit locations by varying along the width of the patch to study the effect of the slit on the antenna characteristics. The simulation result shows that the simple rectangular microstrip patch antenna resonates at a single frequency of 2.43 GHz with a return loss of -22.61 dB. With the introduction of the slit, the antenna shows a dual-band behavior with resonating frequencies lower than the simple rectangular patch antenna. The best dual-band performance is obtained with a return loss of -15.93 dB and -21.53 dB resonating at 1.88 GHz and 2.17 GHz, respectively.
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