Seirpinski gasket fractal antenna with ring-shaped defected ground structure / Khairul Asnawi Anis

This work presents the design and fabrication of a Sierpinski gasket fractal antenna with ring shape defected ground structure (DGS) with the center frequency of 5.8 GHz. The antenna was designed and simulated by using Computer Simulation Technology (CST) and fabricated on RO5880 substrate with dielectric constant, erof 2.2 with thickness of 0.381 mm. Vector Network Analyzer (VNA) was used to measure all the parameters of the antenna such as return loss, VSWR and input impedance. The inclusion of the ring-shape defected ground structure was to improve the overall performance of the antenna. Performance of the proposed antenna is discussed in terms of return loss, gain, input impedance, VSWR, bandwidth and radiation pattern. There were two measurements made which are without stub and with stub matching. For without stub matching, the measurement result was shifted to 5.865 GHz from the center frequency with the return loss is -1 7.762 dB. After stub-matching applied to the Sierpinski antenna, the simulated and measured results were close to each other and achieved the specification for this work at 5.80 GHz the return loss is -25.3 07 dB and unidirectional radiation pattern was realized. The proposed antenna was very compact in size and the measured and simulated values of the parameters of the antenna concur well.