The hole in the ground download6/11/2023 ![]() The stopband centre frequency (8 GHz) is fixed by considering the Bragg condition, l g 1⁄4 2 a, where a is the period of the EBG structure. Moreover, it is necessary to bend the microstrip feed line to avoid filtering effects which would reduce the system efficiency. In particular, the uniform lattice is characterised by the absence of the hole in the ground plane under the patch, in order to not alter the characteristics of the radiant element. The EBG structure consists of a square lattice of circular holes etched in the ground plane. 2 shows the layout of the EBG patch antenna. ![]() PBG patch antenna: To inhibit the surface-wave propagation, a 2-D electromagnetic bandgap structure (EBG) is introduced. ![]() The relationship between the E -plane radiation pattern and the grounded dielectric slab sizes due to the surface-wave effects has been checked to be independent of the kind of the patch antenna feeding. A good agreement between the developed model and the Microwave Studio simulations is obtained when the distance L s between the effective slots corresponding to the grounded dielectric slab is equal to d = 2, d being the length of the grounded dielectric slab, as shown in Fig. identify the L s length, the radiation patterns derived by the developed model given by (4) have been compared with those obtained by CST simulations.
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