Phased-only pattern synthesis for sunflower and conformal arrays with shaped radiation patterns

2018 ◽  
Author(s):  
D. M. Azzam ◽  
H. A. Malhat ◽  
S. H. Zainud-Deen
Keyword(s):  
Radiation Patterns ◽  
Pattern Synthesis ◽  
Conformal Arrays

scholarly journals 3D Pattern Synthesis of Time-Modulated Conformal Arrays with a Multiobjective Optimization Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Wentao Li ◽  
Yongqiang Hei ◽  
Jing Yang ◽  
Xiaowei Shi
Keyword(s):  
Modulation Frequency ◽  
Three Dimensional ◽  
Synthesis Process ◽  
Optimization Approach ◽  
Radiation Patterns ◽  
Pattern Synthesis ◽  
Synthesis Mechanism ◽  
Conformal Array ◽  
Multiobjective Particle Swarm Optimization ◽  
Conformal Arrays

This paper addresses the synthesis of the three-dimensional (3D) radiation patterns of the time-modulated conformal arrays. Due to the nature of periodic time modulation, harmonic radiation patterns are generated at the multiples of the modulation frequency in time-modulated arrays. Thus, the optimization goal of the time-modulated conformal array includes the optimization of the sidelobe level at the operating frequency and the sideband levels (SBLs) at the harmonic frequency, and the design can be regarded as a multiobjective problem. The multiobjective particle swarm optimization (MOPSO) is applied to optimize the switch-on instants and pulse durations of the time-modulated conformal array. To significantly reduce the optimization variables, the modified Bernstein polynomial is employed in the synthesis process. Furthermore, dual polarized patch antenna is designed as radiator to achieve low cross-polarization level during the beam scanning. A 12 × 13 (156)-element conical conformal microstrip array is simulated to demonstrate the proposed synthesis mechanism, and good results reveal the promising ability of the proposed algorithm in solving the synthesis of the time-modulated conformal arrays problem.

scholarly journals Radiation of a Circular Arc Source in a Limited Angle for Non-uniform Conformal Arrays

2020 ◽  
Author(s):  
Giovanni Leone ◽  
Fortuna Munno ◽  
Rocco Pierri
Keyword(s):  
Inverse Problem ◽  
Degrees Of Freedom ◽  
Angular Width ◽  
Pattern Synthesis ◽  
Circular Arc ◽  
Conformal Antennas ◽  
Radiation Properties ◽  
Near Zone ◽  
Conformal Arrays

Conformal antennas lack of general analysis methods of their radiation properties. For a circumference source, we examine the role of the angular width of the observation domain both in far and near zone in determining the set of radiated fields. By an inverse problem approach, the evaluation of the number of independent pieces of information, i.e. the number of degrees of freedom (NDF), and the analysis of the reconstructions of point-like sources allow to introduce optimal array configurations. The results are relevant to the radiation pattern synthesis problem and to array diagnostics applications.

scholarly journals Synthesis of Angle Arrays by the NDF of the Radiation Integral

2020 ◽  
Author(s):  
Giovanni Leone ◽  
Fortuna Munno ◽  
Rocco Pierri
Keyword(s):  
Inverse Problem ◽  
Radiation Pattern ◽  
Degrees Of Freedom ◽  
Synthesis Problem ◽  
Radiation Patterns ◽  
Pattern Synthesis ◽  
Source Geometry ◽  
Hemispherical Coverage

<div>This manuscript has been accepted for publication on IEEE Transactions on Antennas and Propagation.</div><div><br>Abstract:<br>The paper adopts an inverse problem approach to investigate the far zone radiation of a collection of 2D linear sources. By the evaluation of the number of independent pieces of information, i.e. the number of degrees of freedom (NDF), and the analysis of the reconstruction of a focusing beam, the role of the geometry can be examined in determining the set of possible radiation patterns. The results are relevant to the radiation pattern synthesis problem, since they allow to define the optimal source geometry for the hemispherical coverage with identical radiation patterns. </div>

scholarly journals Pattern Synthesis for Dual-Polarized Conformal Arrays via Iterative Convex Optimization

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Chao Liu ◽  
Chuan Li ◽  
Bo Yang
Keyword(s):  
Convex Optimization ◽  
Side Lobe ◽  
Main Lobe ◽  
Pattern Synthesis ◽  
Polarization Component ◽  
Conformal Arrays ◽  
Good Pattern ◽  
Nonconvex Constraint ◽  
Convergence Performance ◽  
Dual Polarized

An iterative convex optimization (ICO) algorithm is proposed to solve pattern synthesis problem under the framework of dual-polarized conformal arrays in this paper. The subproblems of shaping main lobe, optimizing side lobe, and suppressing cross-polarization component are summarized as a joint optimization problem. To solve this problem, the nonconvex constraint about main lobe is rewritten as a convex constraint, which will bring error. And an auxiliary phase function is introduced to correct this error alternatively. Due to the deviation between auxiliary phase and real phase of pattern function, a method minimizing the peak of the synthesis error over observation angles is effectively applied to further improve the performance of the method. Numerical examples show good pattern synthesis ability and convergence performance of the ICO method.

Sign in / Sign up

Export Citation Format

Share Document