Ku Band Annular Ring Antenna on Different PBG Substrates

In this paper, two types of PBG structures, one is the periodic lattice of air holes on the substrate and the other is a periodic lattice of air holes through the substrate and the ground plane, have been incorporated on the FR4 substrate to improve the performance of a simple annular ring antenna operating in the TM31 mode. For Ku band FR4 has higher loss which is reduced by integrating the air holes on the substrates. The effective dielectric constant of the substrates with two PBG structures are calculated theoretically using the Wheeler’s Transform. There is a considerable increase in gain of annular ring antenna with these two different forms of PBG structures. The designed antenna structures are compared to find out an optimum design.