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In this study, the influence of the near field, far field and radiation directivity of microstrip patch antenna when is used mushroom EBG(Electromagnetic Band Gap) as ground is investigated. Using characteristic of dispersion diagram of mushroom EBG, we calculated forbidden band(2.36GHz-2.85GHz) given mushroom type EBG microstrip antenna(2.45GHz) having 2-layer EBG that is operating within forbidden band. In oder to conform performance enhancemen of antenna using EBG ground, we have compared with the antenna using PEC(Perfect Electric Conductor) ground. We could know about 2.74dB increment of the radiation directivity, because EBG can suppress surface wave that is generated at interfaces of the dielectrics-conductor. ※   2013  5 BB21    ° First Author and Corresponding Author :  , yoon1@eagle.kit.ac.kr,  :KICS2013-11-486, :2013 11 8,  : 2013 12 30,  : 2014 1 6 I.                  ,             .          (Meta material)   EBG(Electromagnetic Band Gap)    (High Impedance Surface)HIS   .    / EBG         45  2. EBG   Fig. 2. Equivalent model of EBG (a)

Study on Performance Enhancement of Microstrip Antenna Using EBG Structure