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Design of a Compact Rectangular Patch Antenna Using Defected Ground Structure

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This paper presents the design of low cost compact coaxial fed rectangular patch antennas with the Defected Ground Structure (DGS).The proposed two metamaterial DGS antennas operate at resonating frequencies of 4.7 GHz and 2.4 GHz, and they showed the reduction in size while having considerable performance. A microstrip patch antenna finds its application in WLAN, WiMAX and Wi-Fi in wireless communication services.The performance measures of conventional and DGS antennas had been simulated and analysed in Computer Simulation Technology Microwave Studio (CSTMWS). Prototypes of the coaxial fed rectangular patch antennas operating at 4.7 GHz and 2.4 GHz are fabricated and measured for the experimental validation of the simulation results of the designs. Both the simulation and measurement results showed that the DGS structures improved the performance of the proposed model and the results suggest that DGS reduced the antenna size up to 34.3%  for 4.75 GHZ and 80% for the 2.4 GHz.
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Microstrip Patch Antenna; Operating Frequency; Antenna Gain; Defected Ground Structure; Radiation Pattern; Beam width; Metamaterial

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