Runner-Root Algorithm to Control Sidelobe Level and Null Depths in Linear Antenna Arrays

A novel optimization technique which is developed on mimicking the collective animal behaviour (CAB) is applied for the optimal design of hyper beamforming of linear antenna arrays. Hyper beamforming is based on sum and difference beam patterns of the array, each raised to the power of a hyperbeam exponent parameter. The optimized hyperbeam is achieved by optimization of current excitation weights and uniform interelement spacing. As compared to conventional hyper beamforming of linear antenna array, real coded genetic algorithm (RGA), particle swarm optimization (PSO), and differential evolution (DE) applied to the hyper beam of the same array can achieve reduction in sidelobe level (SLL) and same or less first null beam width (FNBW), keeping the same value of hyperbeam exponent. Again, further reductions of sidelobe level (SLL) and first null beam width (FNBW) have been achieved by the proposed collective animal behaviour (CAB) algorithm. CAB finds near global optimal solution unlike RGA, PSO, and DE in the present problem. The above comparative optimization is illustrated through 10-, 14-, and 20-element linear antenna arrays to establish the optimization efficacy of CAB.

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A Feeding Network with Chebyshev Distribution for Designing Low Side-lobe Level Antenna Arrays

VNU Journal of Science Computer Science and Communication Engineering ◽

10.25073/2588-1086/vnucsce.157 ◽

2017 ◽

Author(s):

Toan The Tang ◽

Tran Minh Nguyen ◽

Giang Truong Vu Bang

Keyword(s):

Antenna Arrays ◽

Linear Array ◽

Side Lobe ◽

Power Divider ◽

Side Lobe Level ◽

Linear Antenna ◽

Sidelobe Level ◽

Weighting Method ◽

Low Sidelobe ◽

Linear Antenna Arrays

This paper proposes a feeding networking to gain low sidelobe levels for microstrip linear antenna arrays. The procedure to design a feeding network using Chebyshev weighting method will be proposed and presented. As a demonstration, a feeding network for 8×1 elements linear array with Chebyshev distribution weights (preset sidelobe level of -25 dB) has been designed. An unequal T-junction power divider has been applied in designing the feeding network to guarantee the output powers the same as Chebyshev weights. The obtained results of the amplitudes at each output port have been validated with theory data. The phases of output signals are almost equal at all ports. The proposed feeding network, therefore, can be a good candidate for constructing a low sidelobe level linear array antenna.

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SYNTHESIS OF THINNED LINEAR ANTENNA ARRAYS WITH FIXED SIDELOBE LEVEL USING REAL-CODED GENETIC ALGORITHM

Progress In Electromagnetics Research ◽

10.2528/pier07061304 ◽

2007 ◽

Vol 75 ◽

pp. 319-328 ◽

Cited By ~ 75

Author(s):

Gautam Kumar Mahanti ◽

Narendra Pathak ◽

Prabhat K. Mahanti

Keyword(s):

Genetic Algorithm ◽

Antenna Arrays ◽

Linear Antenna ◽

Sidelobe Level ◽

Real Coded Genetic Algorithm ◽

Linear Antenna Arrays

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Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays

International Journal of Electronics and Telecommunications ◽

10.2478/v10177-011-0017-8 ◽

2011 ◽

Vol 57 (1) ◽

pp. 115-120 ◽

Cited By ~ 2

Author(s):

Mariusz Zamłyński ◽

Piotr Słobodzian

Keyword(s):

Antenna Arrays ◽

Mutual Coupling ◽

Planar Antenna ◽

Sidelobe Level ◽

Edge Diffraction ◽

Narrow Angle ◽

Compensation Technique ◽

Diffraction Effects ◽

Linear Antenna Arrays

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays In this paper the quality of a technique to compensate for mutual coupling (and other phenomena) in small linear antenna arrays is investigated. The technique consists in calculation of a coupling matrix, which is than used to determine corrected antenna array excitation coefficients. Although the technique is known for more than 20 years, there is still very little information about how different phenomena existing in a real antenna arrays influence its performance. In this paper two models of antenna arrays are used. In the first model the effect of mutual coupling is separated from the aperture edge diffraction. In the second model antenna both mutual coupling and aperture edge diffraction effects are included. It is shown that mutual coupling itself can be compensated very well and an ultralow sidelobe level (i.e. -50 dB) could be achieved in practice. In the presence of diffraction effects -46.3 dB sidelobe level has been attained, but radiation pattern can be controled only in narrow angle range (i.e. up to ±60°).

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