The proposed structure proves to be highly beneficial for improving radiation efficiency and gain. The textured pin substrate leads to generation of forbidden band gap for the propagation of TM 0 surface wave modes and thus enhances radiation characteristics. The periodic arrangement of metallic cylindrical pins with negative dielectric constant has considerably high reflection coefficient to drive the extraneous surface wave fields towards the fringing fields of the antenna. ![]() Metamaterial substrate is presented here with periodic arrangement of metallic cylindrical pins except the area underneath the radiating microstrip patch. Several methods are being tried for suppression of surface wave. Propagation of surface waves in dielectric underneath a microstrip patch antenna poses serious hindrance to the radiation mechanism.
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