Band width of microstrip antenna improved by using mushroom type EBG structure

In this proposed antenna, mushroom type EBG structures are used for suppressing the surface waves. These structures are periodic metallic patches, which are connected to the ground plane with vias. The most important characteristic of the EBG structure is their stop band frequency. By the help of this stop band, the surface waves of the proposed antenna are suppressed. Thus by the suppression of surface waves, the bandwidth of microstrip antenna is improved at same operating frequency from 9.6% to 15.5% i.e 5.9%.