Hybrid Approach for the Synthesis of Unequally Spaced Array Antennas With Sidelobes Reduction

Abstract

Abstract-A hybrid approach is presented to synthesize unequally spaced array antennas with low sidelobes. The exact locations of all the elements for unequally spaced array antennas can be quickly determined with the composite Taylor-Exponent configuration arrangement. Furthermore, an amplitude taper with tremendously simple configuration was designed to reduce the sidelobes for unequally spaced array antennas. Numerical results show that the proposed hybrid approach is effective for the modified synthesis of unequally spaced array antennas, with the sidelobes reduced to be lower than 30 dB.

Principles of adaptive element spacing in linear array antennas

“…A vast variety of evolutionary algorithms such as genetic algorithm (GA), particle swarm optimization (PSO), and differential evolution (DE), were developed for the purpose of optimizing the element positions and excitation to reduce the computational cost [16][17][18][19] . This has led to the development of antenna arrays, realizing narrow beamwidths, null steering and reduced sidelobe levels by controlling the element position and excitation [20][21][22][23] . However, in order to achieve different desired radiation characteristics, it is required that the base element be physically displaced to a pre-determined position.…”

BA-Based Low-PSLL Beampattern Synthesis in the Presence of Array Errors

“…Low-sidelobe beampattern synthesis is one of the most important issues in array antenna synthesis since it can reduce the energy leakage in the region out-of-interest, thus improving the array energy efficiency and reducing the influence of the interferences and/or clutter on the array performance in sidelobe-region simultaneously [1]- [2]. Typical amplitude tapering methods were firstly proposed to reduce the sidelobe level (SLL) of the array, such as Chebyshev distribution [3], Taylor distribution [4], Gaussian distribution [5], and hybrid distribution [6]. In general, not only the array amplitudes, but also the phases and positions of the elements in an array can be properly adjusted to achieve low SLL [7].…”

Wideband characteristics of density tapered array antennas

“…For previous researches on unequally spacing or density tapered arrays, some method of designing unequally spaced arrays was proposed in [16][17][18][19][20][21][22] which achieved side-lobes level (SLL) lower than -25 dB. In [23,24], the particle swarm optimization algorithm is applied to determine the allocation of elements to achieve the minimum sidelobe level and null control in the array radiation pattern.…”