A Novel Band-Notched Antenna with Self-similar Flame Slot used for 2.4 Ghz Wlan and UWB Application

In this paper, a novel microstrip antenna with a self-similar flame-shaped slot fed by a microstrip-line is presented, which can work at both 2.4–2.5 GHz (WLAN) and 3.1–10.6 GHz (UWB). A C-shaped slot is etched on the patch to produce a notched band which can eliminate 5.15–5.825 GHz band-limited by IEEE 802.11a and HIPERLAN/2. Effects of varying the C-shaped slot parameters on the antenna's performance show that the notched band can be finely tuned. The proposed antenna is simulated and measured. The measured results agree reasonably with the simulated ones. According to the measured results, the proposed antenna operates at the range of 2.36–11 GHz with VSWR < 2, except the notched band of 4.6–6 GHz for 5 GHz WLAN. The radiation characteristics of the proposed antenna satisfy UWB systems. The size of the actual antenna is 35 × 35 mm2.