Wideband radar cross-section reduction of patch array antenna with miniaturised hexagonal loop frequency selective surface


Wideband radar cross-section (RCS) reduction of a microstrip patch array antenna is proposed and investigated. The planning is predicated on replacing the solid metal ground of the antenna with a frequency selective surface (FSS) consisted of miniaturised hexagonal loop elements. The stop band of the FSS is coincident with the antenna working frequency band which is from three.3 to 3.four GHz. The FSS acts as the bottom plane in the stop band and is clear to the incident waves in the opposite frequencies. So, preserving the antenna propagation characteristics, wideband RCS reduction is achieved from four to 16.5 GHz for vertical and horizontal polarisations. It is shown that using this FSS incorporates a negligible impact on the impedance bandwidth, pattern and gain of the antenna. Also, there is a smart agreement between the simulation and measurement results.

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