Performance Analysis of Linearly Arranged Concentric Circular Antenna Array with Low Sidelobe Level and Beamwidth...

Area of Science:

• Electrical Engineering
• Antenna Theory
• Signal Processing

Background:

• Antenna arrays are crucial for directed signal transmission and reception.
• Minimizing sidelobe levels (SLL) and beamwidth is essential for improved spatial resolution and interference reduction.
• Existing beamforming techniques face performance degradation due to look direction errors.

Purpose of the Study:

• To propose and evaluate a novel antenna array, the Linearly arranged Concentric Circular Antenna Array (LCCAA).
• To compare the LCCAA's performance against existing beamformers.
• To investigate the effectiveness of robust and tapering techniques in mitigating performance degradation.

Main Methods:

• Development of the Linearly arranged Concentric Circular Antenna Array (LCCAA) beamformer.
• Comparative analysis with geometrically identical conventional beamformers.
• Application of robust techniques: Fixed Diagonal Loading (FDL), Optimal Diagonal Loading (ODL), and Variable Diagonal Loading (VDL).
• Implementation of tapering techniques, specifically the Hamming window.

Main Results:

• The LCCAA achieved the lowest beamwidth (12.50°) and SLL (-15.17 dB) compared to conventional methods.
• Robust techniques (FDL, ODL, VDL) were applied to mitigate look direction errors.
• The Hamming window tapering reduced SLL by 17.097 dB compared to a uniform window.
• A robust tapered (VDL-Hamming) method significantly reduced SLL by 69.92 dB and 48.39 dB over conventional and robust techniques, respectively.

Conclusions:

• The proposed LCCAA beamformer demonstrates superior performance in terms of lower beamwidth and SLL.
• Robust and tapering techniques, particularly VDL-Hamming, substantially improve the LCCAA's performance.
• The LCCAA with the VDL-Hamming technique offers excellent SINR performance and false signal detection capabilities.