Figure 10 Variation of (a) gain (b) radiation efficiency with respect to the frequency
Figure 11 (a-c) shows the far-field radiation patterns (simulated) of the proposed fractal array at three resonances of 5.35 GHz, 7.78 GHz and 9.47 GHz for excited port-1 and port-2. For activated port-1 and port-2 terminated, gain of 3.42 dB (at 5.35 GHz), 2.88 dB (at 7.78 GHz) and 3.88 dB (at 9.47 GHz) is achieved. Due to the mirror image layout of the antenna elements, port-2 shows the same gain performance with complementary far-field patterns at all three resonances. As a result, the radiating elements of the proposed array provide good diversity performance which validates its suitability for wireless applications supported by unlicensed UWB of operation.