Communication29.9pc0.5pt Efficient Shaped Pattern Synthesis for Time Modulated Antenna Arrays Including Mutual Coupling by Differential Evolution Integrated with FFT via Least-Square Active Element Pattern Expansion

This paper presents a novel technique based on Hybrid Spatial Distance Reduction Algorithm (HSDRA), to compensate the effects of deformity and mutual coupling occurred due to surface change in conformal arrays. This antenna surface deformation shifts the position of null points and loss of the main beam resulting in reduced antenna gain along with substantial undesirable effects on the antenna performance. The proposed algorithm, which cumulatively incorporates the Linearly Constraint Least Square Optimization (LCLSO) and Quadratically Constraint Least Square Optimization (QCLSO) techniques, is formulated to minimize/reduce the absolute distance between the actual (simulated/measured) radiation pattern and the desired radiation pattern while keeping the direction of main beam and nulls position under control. In particular, a 4x4 conformal microstrip phased array from planar surface is deformed to prescribe spherical-shape surface with various radii of curvature, is validated. For the enhancement of Gain of the conformal array antenna, Gain Maximization Algorithm is also proposed, the simulated results of which is compared to the traditional Phase compensation technique and unconstraint least squares optimization. The analytical results for both planar and spherical deformed configurations are first evaluated in MATLAB and then validated through Computer Simulation Technology (CST).

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Pattern Synthesis of Linear Antenna Array Using Improved Differential Evolution Algorithm with SPS Framework

Sensors ◽

10.3390/s20185158 ◽

2020 ◽

Vol 20 (18) ◽

pp. 5158

Author(s):

Ruimeng Zhang ◽

Yan Zhang ◽

Jinping Sun ◽

Qing Li

Keyword(s):

Differential Evolution ◽

Antenna Array ◽

Antenna Arrays ◽

Optimization Problem ◽

Differential Evolution Algorithm ◽

Linear Antenna ◽

Pattern Synthesis ◽

De Algorithm ◽

Improved Differential Evolution Algorithm ◽

Linear Antenna Arrays

In this paper, an improved differential evolution (DE) algorithm with the successful-parent-selecting (SPS) framework, named SPS-JADE, is applied to the pattern synthesis of linear antenna arrays. Here, the pattern synthesis of the linear antenna arrays is viewed as an optimization problem with excitation amplitudes being the optimization variables and attaining sidelobe suppression and null depth being the optimization objectives. For this optimization problem, an improved DE algorithm named JADE is introduced, and the SPS framework is used to solve the stagnation problem of the DE algorithm, which further improves the DE algorithm’s performance. Finally, the combined SPS-JADE algorithm is verified in simulation experiments of the pattern synthesis of an antenna array, and the results are compared with those obtained by other state-of-the-art random optimization algorithms. The results demonstrate that the proposed SPS-JADE algorithm is superior to other algorithms in the pattern synthesis performance with a lower sidelobe level and a more satisfactory null depth under the constraint of beamwidth requirement.

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Mutual-Coupling Compensation in Time-Modulated Antenna Arrays for Flat-Top Pattern Synthesis

Electromagnetics ◽

10.1080/02726340903098613 ◽

2009 ◽

Vol 29 (6) ◽

pp. 499-507 ◽

Cited By ~ 3

Author(s):

Gang Li ◽

Shiwen Yang ◽

Guichang Wang ◽

Zaiping Nie

Keyword(s):

Antenna Arrays ◽

Mutual Coupling ◽

Pattern Synthesis

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Asymmetric Shaped-Pattern Synthesis for Planar Antenna Arrays

International Journal of Antennas and Propagation ◽

10.1155/2016/4746381 ◽

2016 ◽

Vol 2016 ◽

pp. 1-13 ◽

Cited By ~ 2

Author(s):

T. M. Bruintjes ◽

A. B. J. Kokkeler ◽

G. J. M. Smit

Keyword(s):

Antenna Arrays ◽

Analytical Method ◽

Direction Of Arrival Estimation ◽

Planar Antenna ◽

Pattern Synthesis ◽

Shaped Beam ◽

Single Output ◽

Free Region ◽

Beam Patterns ◽

Shaped Pattern

A procedure to synthesize asymmetrically shaped beam patterns is developed for planar antenna arrays. As it is based on the quasi-analytical method of collapsed distributions, the main advantage of this procedure is the ability to realize a shaped (null-free) region with very low ripple. Smooth and asymmetrically shaped regions can be used for Direction-of-Arrival estimation and subsequently for efficient tracking with a single output (fully analog) beamformer.

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