EBG patches are separated 0.60mm apart, between two 3£1 arrays EBG the antenna is inserted
(Figure 10(a)). This con¯guration gives better return loss and axial ratio. Dimension of the antenna
and EBG is 137£159mm2. Simulated return loss and axial ratio of the antenna is ¡41:75 dB and
2.3 dB respectively. Then considering the vias radius we calculate the EBG dimensions, gap between
the EBG is 0.21mm and via's radius is 0.025 mm. Layout of the structure is shown in Figure 10(b),
simulated return loss and axial ratio is ¡37:6 dB and 2.3 dB respectively at resonance frequency.
Total dimension of this antenna is 166£175mm2. In Figure 12(b) there is no backward radiation,
this implies changing the size and spacing of EBG we can remove backward radiation. Simulated
antenna can be a good candidate for satellite radio services such as GlobalStar (2.5 GHz).