DP-EBGDual-Planar Electromagnetic Bandgap
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Firstly, the low-pass characteristics of the feed line constructed with the proposed DP-EBG structure are so good that the propagation loss is small and can be comparable to that of a conventional microstrip line.
But the proposed DP-EBG structure with relatively wide stopband can provide satisfactory allowance to reduce the harmonics even some discrepancies exist.
Unlike the EBG antennas introduced in [2,3], where the back radiation at the designed frequency becomes especially large due to the presence of 2-D EBG lattice etched in the ground, there is no energy leaking in our designed EBG antenna because the DP-EBG structure constructed in the feed line cannot resonate effectively as an antenna and produces a negligible radiation loss at the operating frequency.
It is worth underlining that the DP-EBG structure also radiates through the holes on the ground plane in the frequency range 3 GHz-12 GHz even it makes little influence on the radiation pattern of the EBG patch antenna at the fundamental frequency, which can be read from Figure 9 that the level of the back radiation is only a little higher than that of the conventional patch antenna without a EBG structure.