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RCS Reduction of Patch Array Using Shorted Stubs Metamaterial Absorber

Dhawan Singh and Viranjay M. Srivastava
Department of Electronic Engineering, Howard College, University of KwaZulu-Natal, Durban - 4041, South Africa

Abstract –A novel design approach for the out of band radar cross section (RCS) reduction of a conventional 2x2 patch antenna arrays using shorted stubs metamaterial absorber (MMA) operating in X-band has been proposed. Firstly, an ultrathin MMA unit cell with a central frequency of 10 GHz is designed and its scattering parameters, absorbance characteristics and polarization sensitivity have been analyzed. Then, a patch antenna array has been designed at a resonant frequency of 7.54 GHz. Simulation and experimental results exhibit that when patch antenna array is loaded with MMA, its monostatic and bistatic RCS response reduces significantly for the horizontal as well for vertical polarization. However, it has negligible influence on the radiation characteristics, whilst the bandwidth, gain and overall performance of patch array preserved simultaneously. Finally, a compatibility of observation achieved between simulated and measured results.
Index Terms—Antenna array, Frequency selective surfaces (FSS), Metamaterial absorber (MMA), Patch antenna, Radar cross section (RCS).

Cite: Dhawan Singh and Viranjay M. Srivastava, "RCS Reduction of Patch Array Using Shorted Stubs Metamaterial Absorber," Journal of Communications, vol. 13, no. 12, pp. 702-711, 2018. Doi: 10.12720/jcm.13.12.702-711