Synthesis of the Sparse Uniform-Amplitude Concentric Ring Transmitting Array for Optimal Microwave Power Transmission

Abstract

Beam capture efficiency (BCE) is one key factor of the overall efficiency for a microwave power transmission (MPT) system, while sparsification of a large-scale transmitting array has a practical significance. If all elements of the transmitting array are excited uniformly, the fabrication, maintenance, and feed network design would be greatly simplified. This paper describes the synthesis method of the sparse uniform-amplitude transmitting array with concentric ring layout using particle swarm optimization (PSO) algorithm while keeping a higher BCE. Based on this method, uniform exciting strategy, reduced number of elements, and a higher BCE are achieved simultaneously for optimal MPT. The numerical results of the sparse uniform-amplitude concentric ring arrays (SUACRAs) optimized by the proposed method are compared with those of the random-located uniform-amplitude array (RLUAA) and the stepped-amplitude array (SAA), both being reported in the literatures for the maximum BCE. Compared to the RLUAA, the SUACRA saves 32% elements with a 1.1% higher BCE. While compared to the SAA, the SUACRA saves 29.1% elements with a bit higher BCE. The proposed SUACRAs have higher BCEs, simple array arrangement and feed network, and could be used as the transmitting array for a large-scale MPT system.

A Novel Synthesis Method of Sparse Nonuniform-Amplitude Concentric Ring Arrays for Microwave Power Transmission

“…Yet, the maximum BCE obtained from the SUACRA is much lower than that in [12]. As a result, although the array with uniform excitation proposed in [14,15] has a simple feed network, there is a marked decline in terms of BCE. This is undesirable in the MPT system, because it pays much attention to efficiency.…”

“…wavenumber); and θ and ϕ represent the radiation elevation angle and azimuth angle, respectively. It is worth noting that in SUACRA [15], the value of I m of each element is the same, but in SNACRA I m is equal on the same ring and unequal on different rings. ρ 1 = 0 means that there is an element at the center of the SNACRA.…”

“…Moreover, regular fullypopulated transmitting arrays in [12,14] need a large number of array elements, which could increase the cost of MPT systems. In order to reduce the number of elements and the amount of computation, Zhou et al discussed the synthesis of a sparse uniform amplitude concentric ring array (SUACRA) for MPT in [15]. Due to structural circle-symmetry characteristic, the computational complexity of the SUACRA synthesis can be cut down.…”

“…In this paper, a sparse nonuniform-amplitude concentric ring array (SNACRA) is proposed. Compared to the uniform-amplitude concentric ring array in [15], the nonuniform-amplitude concentric ring array has different weights for elements on different rings, but has equal weights for elements on the same ring. Not only does this nonuniform feeding structure for concentric ring array acquire higher BCE, but also its feed network only needs to add a control point for each ring, which hardly increases the complexity of the feed network.…”

Predicting the Frequency Characteristics of Hybrid Meander Systems Using a Feed-Forward Backpropagation Network

“…The manufacture of microwave devices usually consists of several stages: (1) synthesis of physical and geometrical parameters using analytical and numerical iterative methods [1][2][3][4], (2) analysis of synthesized models using analytical and numerical iterative methods [5][6][7][8][9], and (3) experimental verification [10][11][12][13][14]. This procedure is usually time consuming, especially when the approximate parameters are not known and many synthesis iterations are required [15,16].…”