A compact Koch fractal dipole antenna for VHF band / Nor Syazreen Abdul Khodid

This thesis presents a design, simulation and fabrication of a dipole antenna applying fractal Koch curve technique. The antenna was designed for VHF frequency (30MHz - 300 MHz) to resonate at 200 MHz. Koch curve technique was applied in order to reduce the antenna size based on the number of iteration and the degree of flare angle. Size reduction was investigated until iteration two with flare angle of 70°. Three types of the antennas; conventional dipole, iteration I and iteration 2 of the Koch fractal were designed and simulated using Computer Simulation Technology Microwave Studio (CST-MWS). The antennas have been fabricated using copper wire and were fed by 50 n SMA connector. The fabricated antennas were measured using Vector Network Analyzer (VNA). The performances of the antennas such as return loss, gain and directivity has been analyzed. The size of fractal antenna was successfully reduced up to 27.05% and 36.07% for iteration I and iteration 2 compare to the conventional dipole antenna.