Analysis of the Behavior of Sierpinski Carpet Monopole Antenna

− Three fractal monopole antennas using the Sierpinski carpet geometry is described in this paper. The idea for these designs is gotten from semi-log-periodic behavior of fractal antenna. In this paper, we noted input impedance matching of antennas throughout the passband of them. In this point of view, we will apply the wideband, broadband and multiband for these antennas. Our first wide-band design is named antenna-1. This has a good input impedance match throughout the passband 2-20GHz. Second antenna is named antenna-2. This antenna has an interesting behavior while has a multiband behavior from 1-7GHz and has broad-band behavior from 7-20 GHz. However, because of two slots in ground plane of this antenna, the 6-7GHz band is eliminated. Third of antennas is named antenna-3. It has a multi-band behavior from 0.5-17GHz. On average, we could match input impedance of proposed antennas, for three desired behavior. The dimension of mainsquare for antenna-1, antenna-2 and antenna-3 is 45, 60 and 132 mm respectively. These antennas are suitable for the operating bands of GSM, ICMS, UMTS, Bluetooth, WLAN and HIPERLAN systems. Keyword: Fractal antenna, sierpinski-carpet, semi-logperiodic behavior.