A Planar Self-Complementary Fractal Triangular Antenna for UWB Applications

Enhancement of planar triangular monopole antenna (PTMA) has been introduced here via applying the self-complementary principle on its first iteration fractal configuration to produce a self-complementary fractal triangular dipole antenna (SCFTDA). The modification suggested here is directly applied on a predesigned fractal PTMA to compare the efficiency of improvement of PTMA antenna by using each of these two different techniques; the fractal and self-complementary. Simulation results shown that the fractal design gives more resonating at 2.45 GHz, but almost the response at other frequencies hasn't been changed obviously. Unlike the SCFTDA antenna, which has a very clear improvement, especially at those frequencies above 3 GHz. This improvement enables that antenna to be used for UWB applications. The return loss curve of SCFTDA antenna has been reduced below the level of -10 dB for a range of frequencies start from 4 GHz to more than 11 GHz, which almost covers the entire UWB range (3.1~10.6 GHz) except the first 0.9 GHz of this band (3.1~4 GHz). This improvement extended to include the gain performance as well, which validates the overall improvement, and almost without affecting the omnidirectionality of its radiation pattern.