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.