META Conference, META'10

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Rectangular Patch Antennas over Electromagnetic Band Gap Structure
Nihal Fayze

Last modified: 2009-11-03

Abstract


In this paper, I propose a new design of a Defected Structure (DS) for use as an Electromagnetic Band Gap (EBG) configuration for printed antennas and circuit applications. The proposed defected structure embodies a honeycomb lattice of air cylindrical holes. The proposed DS is applied in three different configurations using dielectric substrate (dielectric constant 6 and thickness 1.5 mm); namely: defected ground plane, defected dielectric substrate and defected dielectric substrate backed by defected ground plane. The simulated values of the transmission coefficient S21 for the latest one show two well defined stop bands around 8.5 and 9.5GHz, respectively. The first band has been used to reduce mutual coupling in a microstrip array and the S21 parameter has also been examined. The S21 results show that the reduction in E-plane coupling between the radiating elements is nearly 3dB. On the other hand, the stop band defined around 9.5GHz has been applied to enhance the characteristics of rectangular patch antenna. The calculated values of S11 show that the 10dB operational bandwidth is 1.3369GHz or 14.3%. Conventional patch design, without the proposed EBG structure, typically only resonant with less than 5.6% bandwidth.