Abstract:
In this research, a novel antenna array named Linearly arranged Concentric Circular
Antenna Array (LCCAA) is proposed, concerning lower beamwidth, lower sidelobe level, sharp
ability to detect false signals, and impressive SINR performance. The performance of the proposed
LCCAA beamformer is compared with geometrically identical existing beamformers using the
conventional technique where the LCCAA beamformer shows the lowest beamwidth and sidelobe
level (SLL) of 12.50° and 15.17 dB with equal elements accordingly. However, the performance
is degraded due to look direction error, for which robust techniques, fixed diagonal loading (FDL),
optimal diagonal loading (ODL), and variable diagonal loading (VDL), are applied to all the potential
arrays to minimize this problem. Furthermore, the LCCAA beamformer is further simulated to reduce
the sidelobe applying tapering techniques where the Hamming window shows the best performance
having 17.097 dB less sidelobe level compared to the uniform window. The proposed structure is
also analyzed under a robust tapered (VDL-Hamming) method which reduces around 69.92 dB and
48.39 dB more sidelobe level compared to conventional and robust techniques. Analyzing all the
performances, it is clear that the proposed LCCAA beamformer is superior and provides the best
performance with the proposed robust tapered (VDL-Hamming) technique.