Application of golden ratios in non-uniform linear array design

• Main Author: Huang, Yi
• Other Authors: Ng Boon Poh
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2022
• Subjects: Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio
• Online Access: https://hdl.handle.net/10356/155525
• Institution: Nanyang Technological University

Antenna arrays are the key technologies in applications such as radar, sonar and wireless communications. The design of antenna arrays to achieve desired performance involves trade-offs among the array geometry, the side lobe levels and main beamwidth. Uniform antenna arrays, with their simple configuration, have been extensively studied. However, uniform arrays require a high level of flatness in working environment and are costly in large antenna applications due to the large number of elements. To further improve the overall performance of array synthesis, non-uniform arrays have attracted much attention recently. Due to the non-uniform spacing between antennas, non-uniform arrays can provide additional degrees of freedom for beampattern optimization and reduce the number of array elements and manufacturing costs. In this dissertation, it has proposed six non-uniform linear arrays with three different golden ratio (GR) sequences applied in the spacing between antenna elements. The antenna spacings of these non-uniform arrays are designed based on the Fibonacci sequence, GR sequence, and Lucas sequence, respectively. They are optimized by changing root and scaling values. During the experiments, the uniform linear array acts as a control group to specify how the performance of the non-uniform linear array is progressively optimized. Simulation results show that the proposed non-uniform linear arrays obtain higher directivity than the conventional uniform linear array. The six schemes are optimized and their configurations and performance measurements are also documented in detail. The performance was ranked from best to worst: cumulative Lucas array, non-cumulative Lucas array, cumulative GR array, non-cumulative GR array, cumulative Fibonacci array and non-cumulative Fibonacci array.