Closed-Form Directivity Expression for Arbitrary Volumetric Antenna Arrays

Costa, Bruno Felipe; Abrão, Taufik

doi:10.1109/tap.2018.2869243

Cited by 13 publications

(8 citation statements)

References 11 publications

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“…The directivity in analytical closed form models of antenna arrays are presented in the literature. [8][9][10][11] Maximum directivity and other performance parameters discussed above are simultaneously achieved by the use of optimization algorithms. In the optimization process the number of elements, amplitude, inter-element spacing and the phase parameters of the array elements are optimized to achieve the goal.…”

Section: Introductionmentioning

confidence: 99%

“…The LAs and CAs transmit narrower directive beams with improved antenna gain and suppressed maximum side lobe level (MSLL) relative to single antennas. Numerous works on synthesis and analysis of LAs and CAs are discussed in the literature 1‐27,29 . Out of the LAs and CAs, for a specific number of elements, the space requirement for LAs are more.…”

Section: Introductionmentioning

confidence: 99%

“…Guiding main beam in a particular direction along with placing nulls in some other directions, suppressing MSLL, achieving higher directivity are the wide aims of designing an antenna array. The directivity in analytical closed form models of antenna arrays are presented in the literature 8‐11 . Maximum directivity and other performance parameters discussed above are simultaneously achieved by the use of optimization algorithms.…”

Section: Introductionmentioning

confidence: 99%

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Improved Salp swarm optimization based circular arrays in presence of mutual coupling

Pradhan

Mangaraj

Behera

2021

Int J RF Mic Comp-Aid Eng

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This article presents optimization of circular arrays with mutual coupling effect (MCE) using newly developed algorithm, Improved Salp swarm optimization (ISSO). ISSO is employed to achieve optimum radiation patterns of circular array (CA), and concentric circular array (CCA). The radiation patterns illustrate directive main beams with various outcomes, such as suppressed maximum side lobe level, deep nulls placed in specific directions, and maximum possible directivity. The main beams of the patterns are made narrow and directive by maintaining the first null beam widths equal or less than that of uniform CA and CCA throughout the optimization process. The above performance parameters are obtained by optimizing the parameters like excitation currents, positions, and phases of the array elements, and number of array elements using a multi-objective optimization function (OF). The OF is formulated by considering the performance parameters and MCE. The outcomes are analyzed for eight different optimization case studies of CA and CCA. The results of the CA and CAA using ISSO are compared with that of other optimization methods found in the literature. The performance parameters of the case studies considered indicate that CA configurations using ISSO offer improved performance relative to uniform arrays and the configurations achieved using other methods of optimization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Salp swarm optimization based circular arrays in presence of mutual coupling

Pradhan

Mangaraj

Behera

2021

Int J RF Mic Comp-Aid Eng

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“…S INCE directivity is a significant figure of merit of an antenna array, several attempts have already been made to provide a convenient expression for the calculation of directivity of linear and planar arrays arrays [1]- [4]. Multibeam antenna arrays have been widely used in communication and surveillance systems such as MIMO [5], electronic countermeasures, direct broadcasting [6] and multiple-target radar systems [7].…”

Section: Introductionmentioning

confidence: 99%

Some useful approximations for calculation of directivities of multibeam power patterns of large planar arrays

Shabanpour¹,

Oraizi²

2020

Preprint

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In this paper, by adopting the superposition of terms with unequal coefficients, some useful closed-form formulas for the class of large planar arrays are presented for predicting the directivities of radiated beams. Despite the applied simplifying assumptions, the provided formulas may be used for designing a large multiple-beam planar array with a specified power pattern. Several illustrative examples are presented which are numerically demonstrate by the MATLAB software. The applicability of the proposed synthesis method verified by the achieved conformity between the simulations and theoretical predictions. Furthermore, the impact of quantization and array dimensions on the performance of power controlling as well as the limitations on the maximum scan angle are investigated. It is believed that the proposed straightforward approach for array synthesis provides a new opportunity for various applications such as multiple-target radar systems and beamforming array antenna.

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“…Several authors have treated the problem of expressing the directivity of an array in the closed form. Such expressions for the directivity can be found for a phased array with prescribed current distributions [14], a Dolph-Chebyshev array [15], or an arbitrary volumetric array [16]. Nonetheless, no superdirective excitation is considered in these works.…”

Section: Introductionmentioning

confidence: 99%

On end‐fire super directivity of arrays of two elementary dipoles and isotropic radiators

Hazdra

Kracek

Lonsky

2019

IET Microwaves, Antennas & Propagation

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The concept of source currents of a radiating source can be employed to express its directivity in some particular cases analytically. For an antenna array, this concept can be extended to the concept of a generalised directivity based on self‐ and mutual radiation intensities, self‐ and mutual radiated powers and excitation currents of array elements. These approaches were applied to examples of the array of two elementary dipoles and the array of two isotropic radiators. Particularly, the evaluation of the directivity of the end‐fire arrays, which are of special attention due to superdirective properties, was treated. Novel closed‐form expressions for the directivity of these arrays with out‐of‐phase excitation were derived. It was observed that the end‐fire directivity can be further enhanced by optimising the excitation currents of the arrays. Their optimal phase difference and corresponding increased directivity were also found analytically. The results were validated by a full‐wave simulator.

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Closed-Form Directivity Expression for Arbitrary Volumetric Antenna Arrays

Cited by 13 publications

References 11 publications

Improved Salp swarm optimization based circular arrays in presence of mutual coupling

Improved Salp swarm optimization based circular arrays in presence of mutual coupling

Some useful approximations for calculation of directivities of multibeam power patterns of large planar arrays

On end‐fire super directivity of arrays of two elementary dipoles and isotropic radiators

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