Sierpinski carpet fractal antenna with circular shaped defected ground structure (DGS) / Mohamad Fadhli Rahim

This work presents the design, simulation and fabrication of a Sierpinski carpet fractal antenna with circular shaped defected ground structure (DGS). The proposed antenna was designed and simulated at the centre frequency of 5.8 GHz and fabricated on Rogers RT/Duroid 5880 substrate with relative permittivity, Er of 2.2, substrate thickness, h of 0.381 mm and copper thickness, t of 0.017 mm. Computer Simulation Technology (CST) software was used in designing and simulation. Measurements of the parameters of the antenna were carried out by using Vector Network Analyzer (VNA). The antenna was designed with a circular shaped DGS. The performance of the antenna was improved through the position of the circular shaped DGS. Performance of the antenna was discussed in term of return loss (S 11), voltage standing wave ratio (VSWR) and radiation pattern. This work was discussed of perfmmance of the fractal antenna which was to see the comparison between different number of iterations and second discussion was done with the implementation of DGS and without DGS. The results from the simulation and measurement was compared and discussed. The measurement result for center frequency was 5.74 GHz and the return loss was 49.094 dB. Both the measured and simulated values concur well and satisfied the specification. The antenna has achieved unidirectional pattern and at the same time reduced in size and dimension. The antenna can be used for RFID application.