Optimizing the Position of Graphene Oxide Absorber to Enhance the Radiation Pattern of Antenna Array

Placement of electromagnetic wave absorber in vicinity of radiating elements will undoubtedly affects the radiation pattern of array. Variation in beam pattern of array depends on position of absorber and accordingly it can enhance or deteriorate the array pattern. Altering the major lobe axis of array structure due to action of absorber degrades the array performance while supressing the back lobe and side lobes of array without effecting major lobe increases front to back ratio of array resulting enhancement in array directivity and gain. In this paper, effort has been done to find out the best position of electromagnetic absorber to improve the array pattern by means of increasing gain and directivity and supressing the levels of sidelobes. A graphene oxide based absorber which is compatible with circular patch antenna array has been designed first. Further the proposed absorber is integratedon the same substrate but at the different positions of antenna array. The radiation pattern in each case has been analysed and the optimum position has been proposed on basis of increased array gain, directivity, sidelobe level reduction while maintaining pattern symmetry.