Abstract
A Coherent Multiple Beamforming Network for a Non-uniform Circular Antenna Array
Highlights
The technology of multiple-beam antennas exhibits desirable capabilities in modern antenna applications, where its antenna array based solution offers flexibility on the radiation operation
This paper presents as main contribution a detailed analysis of the performance of an antenna system that exploits the nonuniformity in circular arrays with a design of a coherent beamforming network
The Differential Evolution (DE) strategy with random selection, one difference vector, and binomial crossover is applied to the antenna system, with the following parameters: the algorithm initializes with a population (Np) of 500 individuals with the same maximum number of iterations ensuring a good sampling of the solution space, a mutation factor set in F = 0.5 with a crossover rate (CR) of 0.9
Summary
The technology of multiple-beam antennas exhibits desirable capabilities in modern antenna applications, where its antenna array based solution offers flexibility on the radiation operation These systems can radiate multiple independent countoured beams with advanced features as beam steering, high-directive beam, among others intelligent beam operations. Such radiation features in general require a beamforming network to properly provide a predefined phase and amplitudes distribution to the array radiating elements [1], [2]. The most notable and studied work based on lossless multiple beamforming networks lies in Blass [3], Butler [4] and Nolen [5] matrices Despite, these lossless matrices have low-loss properties, the orthogonal behavior at the output tend to a more restrictive pattern shape, inhibiting the flexibility in the overall design [6]
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