A Method for Thinning Useless Elements in the Planar Antenna Arrays

Mohammed, Jafar Ramadhan

doi:10.2528/pierl21022104

Cited by 14 publications

(14 citation statements)

References 15 publications

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“…Also, it was reported that GA is not efficient in mitigating interfering sources as LMS [51,52]. On the other hand, the GA algorithm was proven to be an efficient for array thinning [27,30,31,36] so that it was utilized for thinning the proposed array design. In the LMS approach, the weights of antenna elements are calculated and updated recursively utilizing the steepest-descent method with a step size of 0.05 [53].…”

Section: B Ga-lms Beamforming Resultsmentioning

confidence: 99%

“…Among which, the Particle Swarm Optimization (PSO) [28,29], Genetic Algorithm (GA) [27,30,31], Simulated Annealing (SA) [32,33], Ant Colony Optimization (ACO) [34], and Boolean Differential Evolution Algorithm (BDE) [35] were used. In [36], the binary GA technique was employed to optimize the excitations of the outer elements of planar antenna array and to reduce the number of active elements while preserving the desired radiation characteristics. In [37], a new stochastic optimization approach, called Slime Mold Algorithm (SMA), was investigated to design thinned concentric circular antenna arrays with lowest SLL and fixed HPBW.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Wideband Thinned Eisenstein Fractile Antenna Arrays With Adaptive Beamforming Capability and Reduced Side-Lobes

2022

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A modern design of fractal antenna arrays, called fractile array, which exhibits a fractal boundary contour within a tiled plane, is explored for enhanced array performance. In this paper, the Eisenstein fractile array is introduced to exploit the unique geometrical features of fractiles that allow multiband and wideband operation and avoid grating lobes in the radiation pattern even, in some cases, when the array elements' spacing is greater than the half wavelength. To alleviate the large number of elements and the high Side-Lobe Level (SLL) occurred at large scales, the Genetic Algorithm (GA) optimization technique is considered for thinning the proposed antenna array by estimating the optimal set of "on" and "off" elements corresponding to the minimum SLL without degrading the directivity of the radiation pattern. Also, the proposed array configuration is designed with adaptive beamforming capability using the Least Mean Square (LMS) technique. The effectiveness of the proposed GA-LMS approach is investigated by performing several MATLAB simulations under various set of array configurations. Results reveal that the suggested thinned Eisenstein fractile antenna array using GA-LMS approach is superior in terms of multiband and wideband performance, array element reduction, SLL reduction, grating lobe elimination, and beamforming capability. This elucidates the robustness of the suggested thinned Eisenstein fractile array as a promising design for multiband, wideband, compact, inexpensive, and adaptive smart antennas in modern wireless systems.

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Section: B Ga-lms Beamforming Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Wideband Thinned Eisenstein Fractile Antenna Arrays With Adaptive Beamforming Capability and Reduced Side-Lobes

2022

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“…Moreover, regular fully populated transmitting arrays need a large number of array elements which could increase the cost of WPT systems [13]. To reduce the number of array elements, the synthesis of a sparse uniform amplitude concentric ring array (SUACRA) for MPT is discussed in [14,15]. Another new method based on subarray division is investigated in [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Planar Array Antenna for Wireless Power Transmission

Guo¹,

Hao²,

Song³

et al. 2022

PIER C

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A newly synthesis method of planar array antenna for wireless power transmission (WPT) is introduced in this paper. The whole array aperture is divided into several subarrays which can reduce the complexity of the feed network and the cost of the array antenna. Invasive Weed Optimization (IWO) algorithm is used to optimize the subarray division and the excitation amplitude of each subarray. The maximum beam collection efficiency (BCE) and maximum sidelobe level outside the receiving area(CSL) are considered as the evaluation index. The synthesis results show that the proposed method can obtain higher BCE and lower CSL.

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“…In all of those aforementioned methods, it is required to readjust (or redesign) the excitation weights of all or most of the active elements which are practically complex and time consuming. Moreover, they are only considered a very limited number of defective elements that are usually located randomly on the array sides and not on the array center [9,10]. As a matter of fact, the central array elements usually have the largest excitation weights which make their compensation difficult when they are facing faults.…”

Section: Introductionmentioning

confidence: 99%

Array Pattern Restoration Under Defective Elements

Mohammed¹,

Abdulqader²

2022

PIER C

Self Cite

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The defective array elements which are unavoidable due to the long full-time antenna system operation directly affect its radiation pattern, sidelobe level, directivity, and the system performance. Therefore, reducing these undesirable effects is a main interest in designing such arrays in practice. In this paper, a partially compensating method based on the genetic optimization algorithm is proposed to mainly reduce those undesirable effects of the defected elements. Unlike the existing fully compensating methods where all of their active elements were optimized to compensate for the effects of the defected elements, the proposed method optimizes the excitation weights of some optimally selected activeelements. Thus, the whole array elements do not need to be redesigned again as in the case of the fully compensating methods. This greatly simplifies the design implementation of these arrays. Moreover, a very large defective percentage ranging from 5% up to 50% has been considered to demonstrate the effectiveness of the proposed method. Furthermore, the drawback effects of the randomly failing elements at the array center have been highlighted, and some suggestions have been provided.

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A Method for Thinning Useless Elements in the Planar Antenna Arrays

Cited by 14 publications

References 15 publications

Synthesis of Wideband Thinned Eisenstein Fractile Antenna Arrays With Adaptive Beamforming Capability and Reduced Side-Lobes

Synthesis of Wideband Thinned Eisenstein Fractile Antenna Arrays With Adaptive Beamforming Capability and Reduced Side-Lobes

Synthesis of Planar Array Antenna for Wireless Power Transmission

Array Pattern Restoration Under Defective Elements

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