Miniaturization of fractal Koch dipole antenna for VHF Band / Nordinie Noor

This thesis presents the design of dipole antenna applying the method of reducing size through fractal Koch curve technique. The antenna is designed to operate at Very High Frequency (VHF) band and resonates at frequency 268 MHz. The Koch curve technique is applied based on the number of iteration and degree of flare angle. Three types of antenna; conventional antenna, iteration 1 and iteration 2 of fractal Koch antennas were designed and simulated using Computer Simulation Technology Microwave Studio (CST-MWS). These antennas were fabricated using copper wire with 50 Q SMA connector. A Vector Network Analyzer (VNA) was used to measure the return loss, S l 1. The performances of these antennas in term of return loss, directivity, gain and radiation pattern were observed and analyzed. The size of fractal antenna for iteration 1 and iteration 2 have been successfully reduced by 22.1 % and 34.6 % as compared to the conventional dipole antenna at the same frequency.