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COMPACT EBG STRUCTURE FOR ALLEVIATING MUTUAL COUPLING BETWEEN PATCH ANTENNA ARRAY ELEMENTS
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DOI：10.2528/PIER12121205.png)
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The periodic structure like electromagnetic band gap (EBG) is a hot research topic in the academia and RF-microwave industry due to their extraordinary surface wave suppression property. This study involved in designing a compact uni-planar type EBG structure for a 2.4 GHz resonant frequency band. Double folded bend metallic connecting lines are successfully utilized to realize a low frequency structure while a size reduction of 61% is achieved compared to the theoretically calculated size. From the transmission response, the surface wave band gap (SWBG) is found to be 1.2 GHz (1.91-3.11 GHz) whereas the artificial magnetic conductor (AMC) characteristic is observed at 3.3 GHz. The FEM based EM simulator HFSS is used to characterize the EBG structure. The SWBG property is utilized for alleviation of mutual coupling between elements of a microstrip antenna array. A 2 x 5 EBG lattice is inserted between the E-plane coupled array which reduced the coupling level by 17dB without any adverse effect on the radiation performances.
Keyword:
MICROSTRIP ANTENNA
BANDWIDTH ENHANCEMENT
GROUND PLANE
PERFORMANCE
REDUCTION
DESIGN
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