*3.1.2.3 Radiation diagram*

The 3D radiation pattern at the 8 GHz frequency. We can say that the radiation is focused on both sides of the antenna. At the frequency f = 8 GHz the gain of antenna is 4.28 dBi (**Figure 10**) and a directivity of antenna is 4.87 dBi (**Figure 11**).

**Figures 12** and **13** show the far-field gain and far-field directivity in plane E. For both the opening of the main lobe at -3 dB for the frequency 8 GHz is 66.9˚ [16, 17].
