scholarly journals AN ARBITRARY CONFORMAL ARRAY PATTERN SYNTHESIS METHOD THAT INCLUDE MUTUAL COUPLING AND PLATFORM EFFECTS

2010 ◽  
Vol 110 ◽  
pp. 297-311 ◽  
Author(s):  
Qi Wang ◽  
Qing-Qiang He
Keyword(s):  
Mutual Coupling ◽  
Synthesis Method ◽  
Pattern Synthesis ◽  
Conformal Array ◽  
Array Pattern

scholarly journals Conformal Array Pattern Synthesis Using a Hybrid WARP/2LB-MOPSO Algorithm

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Roghieh Karimzadeh Baee ◽  
Keyvan Forooraghi ◽  
Somayyeh Chamaani
Keyword(s):  
Degrees Of Freedom ◽  
Mutual Coupling ◽  
Side Lobe ◽  
Penalty Functions ◽  
Main Beam ◽  
Side Lobe Level ◽  
Initial Population ◽  
Pattern Synthesis ◽  
Conformal Array ◽  
Multiobjective Particle Swarm Optimization

This paper addresses conformal array synthesis as a constrained multiobjective optimization problem. Simultaneous reduction of side lobe level (SLL) and cross-polarization (XPL) level is aimed with a constraint on main beam direction. A hybrid of weighted alternating reverse projection (WARP) and two local best multiobjective particle swarm optimization (2LB-MOPSO) is proposed to optimize the pattern. First, the WARP method finds a moderate and feasible solution. Second, 2LB-MOPSO begins with an initial population including the solution of WARP and penalty functions for constraint handling. Involving WARP result in the initial population of 2LB-MOPSO leads to higher convergence rate, avoiding local extermum traps and less sensitivity to penalty functions. Compared to WARP method which stagnates rapidly, the proposed hybrid method gives better SLL and XPL after adequate iterations. In addition, as 2LB-MOPSO offers a set of optimum solutions (Pareto front) instead of a single solution, this method provides more degrees of freedom in selection of proper practical arrays. Finally, to examine the mutual coupling consideration in array design, the same procedure was applied ignoring the mutual coupling between elements. The results show that the SLL and XPL strongly depend on mutual coupling.

Radiation Pattern Synthesis and Mutual Coupling Compensation in Spherical Conformal Array Antennas

2021 ◽  
Vol 36 (6) ◽  
pp. 707-717
Author(s):  
Taimur Khan ◽  
Muhammad Khattak ◽  
Adnan Tariq
Keyword(s):  
Radiation Pattern ◽  
Mutual Coupling ◽  
Surface Deformation ◽  
Spherical Shape ◽  
Least Square ◽  
Spatial Distance ◽  
Main Beam ◽  
Antenna Gain ◽  
Pattern Synthesis ◽  
Conformal Array

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).

scholarly journals Scalable Alternating Projection and Proximal Splitting for Array Pattern Synthesis

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Yubing Han ◽  
Chuan Wan
Keyword(s):  
Practical Importance ◽  
Synthesis Method ◽  
Invariance Property ◽  
Pattern Synthesis ◽  
Scaling Invariance ◽  
Array Pattern ◽  
Pattern Projection ◽  
Weighted Matrix ◽  
Alternating Projection ◽  
Selection Of

Array synthesis with embedded element patterns is a problem of great practical importance. In this paper, an array pattern synthesis method using scalable alternating projection and proximal splitting is proposed which considers the scaling invariance property of design specifications and constraints for the amplitudes of pattern and excitation. Under the framework of alternating projection, the scalable pattern and excitation constraint sets are first defined. Then the scalable pattern projection and iterative procedure for optimum pattern scaling factor are studied in detail. For the scalable excitation projection, it is designed as the solution to a constrained weighted least mean squares optimization, which can be solved by an effective forward-backward splitting iterative process. Finally, the selection of the weighted matrix and computational complexity are discussed briefly. Several typical linear and planar synthesis examples with or without the embedded element patterns are provided to demonstrate the effectiveness and power of the proposed method.

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