Abstract
In this article, authors have designed a slotted microstrip patch antenna comprising of a circular ring embedded in the center. Initially, the designed conventional patch antenna operates at 2.45 GHz. However, when two slots are etched on both ends of the patch, an additional resonant frequency band is obtained at 5.8 GHz, which reduces to 5 GHz when an annular ring is inserted between these two slots. The gain and bandwidth of the designed antenna are 4 dBi and 400 MHz at 5 GHz and 8 dBi and 270 MHz at 2.45 GHz. Thus, the proposed antenna can accommodate both IEEE 802.11a Wi-Fi bands operating at 2.45 and 5 GHz. This dual band antenna is designed on 1.48 mm thick FR-4 substrate with dielectric constant of 4.3 and loss tangent of 0.01. The designed structure is excited by a SMA coaxial connector of 50-Ω. High Frequency Structure Simulator software (HFSS) is used for designing and simulating this antenna. This commercially available software is based on finite element method.
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