Circular and Concentric Circular Antenna Array Synthesis Using Cat Swarm Optimization

Ram, Gopi; Mandal, Durbadal; Kar, Rajib; Ghoshal, Sakti Prasad

doi:10.1080/02564602.2014.1002543

Cited by 43 publications

(44 citation statements)

References 24 publications

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“…All the array elements of CCAA are considered to be isotropic sources in this paper. Thus, its radiation pattern is represented by its AF only which is given in (10)

italicAF ((),,, θ, ϕ, I) = 1 + \sum_{p = 1}^{p} \sum_{i = 1}^{N_{p}} I_{p} exp ([], j true({kr}_{p} sin θ cos ((), ϕ - ϕ_{pi} true) + α_{pi})) .

The current excitation amplitude weight of p th circular ring is represented by I p ; k is the propagation constant; θ and ϕ are elevation and azimuth angle, respectively, ϕ pi is the inter‐element angle.…”

Section: Time‐modulated Antenna Arraymentioning

confidence: 99%

“…The CCAA has extensive applications in radio systems like direction finding, radar, RF transmission, navigation and underground propagation, etc. A lot of research on CCAA synthesis has been reported in previous studies . A number of heuristic search algorithms like cat swarm optimization (CSO), biogeography‐based optimization (BBO), firefly algorithm (FA), symbiotic organism search (SOS), moth‐flame optimization (MFO) have been employed for the design of CCAA.…”

Section: Introductionmentioning

confidence: 99%

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An optimal far‐field radiation pattern synthesis of time‐modulated linear and concentric circular antenna array

Das

Mandal

Kar

2019

Int J Numerical Modelling

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In this paper, an optimal far‐field radiation pattern synthesis by using time modulation technique is carried out for linear antenna array (LAA), and concentric circular antenna array (CCAA) designs using a stochastic optimization method called grey wolf optimization (GWO). An improved far‐field radiation characteristic mainly depends on the synthesis of low side lobe level (SLL) and narrow first null beam width (FNBW). A low SLL is a requirement to reduce the interference by the other systems operating in the same frequency band. A narrow FNBW is necessary to obtain a high directivity. In time modulation technique, “time” has a most significant role. It is considered as the fourth‐dimensional parameter as it plays the role of an additional degree of freedom to achieve an improved radiation pattern. The time‐modulated antenna array (TMAA) radiates at various harmonic frequencies for the periodic switching time sequence. In this paper, the generation of radiation pattern only at the fundamental/central frequency and at its first two harmonic frequencies are considered. The GWO algorithm is a flexible and robust search algorithm and is applied here to find out the optimum sets of switching on‐time duration for each array element and to determine the optimum inter‐element separation between two array elements of the 16‐element time‐modulated linear antenna array (TMLAA) and the nine‐ring time‐modulated concentric circular antenna array (TMCCAA). The GWO algorithm‐based results show a substantial improvement in far‐field radiation pattern synthesis compared with the uniform radiation pattern and those of the methods reported in state‐of‐the‐art literature.

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“…All the array elements of CCAA are considered to be isotropic sources in this paper. Thus, its radiation pattern is represented by its AF only which is given in (10)

italicAF ((),,, θ, ϕ, I) = 1 + \sum_{p = 1}^{p} \sum_{i = 1}^{N_{p}} I_{p} exp ([], j true({kr}_{p} sin θ cos ((), ϕ - ϕ_{pi} true) + α_{pi})) .

Section: Time‐modulated Antenna Arraymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An optimal far‐field radiation pattern synthesis of time‐modulated linear and concentric circular antenna array

Das

Mandal

Kar

2019

Int J Numerical Modelling

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“…The proposed technique is different from [4][5][6][7][8][9][10][11] in the sense that the authors here considered the length of parasitic elements and spacing between the parasitic elements as design variables to obtain the desired requirements keeping the position and length of active element fixed. Moreover, this technique is different from [4][5][6][7][8][9][10][11] in the sense that authors here considered real antennas including mutual coupling effect. In addition to it, coupling effect is also compensated by minimizing the reflection coefficient of the driven element to the specified value.…”

Section: Major Contribution Of the Proposed Workmentioning

confidence: 99%

“…In recent years circular arrays have become more in demand over other array geometries because of circular arrays have the potential to perform the scan in all the directions without a significant change in the beam pattern and provides azimuth coverage of 360 0 [4][5][6][7][8][9][10][11]. Many researchers presented approaches for reduction of side lobe level with fixed beam width in circular antenna arrays by changing the excitation amplitudes and spacing between the elements [4][5][6][7][8][9][10]. Synthesis of circular antenna arrays with low side lobe level under both no beam scanning and beam scanning conditions using amplitude only and amplitude spacing are detailed in [11].…”

Section: Introductionmentioning

confidence: 99%

Design of Non-Uniformly Spaced Circular Arrays of Parasitic Dipoles for Lower Side Lobe Level with Maximum Directivity

Patidar

Mahanti

2018

AEM

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This paper presents a new approach for circular array of parasitic dipoles composed by one active dipole for reduction of side lobe level with maximum directivity including mutual coupling. The desired goal is obtained by changing the spacing between the parasitic elements and length of the parasitic elements while the position and length of driven element is fixed. In addition to it, reflection coefficient (RC) of the driven element is kept closer to the specified value. Matlab based method of moment code is used to evaluate the performance of circular antenna designs generated by QPSO algorithm. Two examples are presented to show the effectiveness of this proposed approach.

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“…Extensive research on linear antenna array (LAA) and CAA synthesis have been reported in the literature. [3][4][5][6][7][8][9][10][11][12][13][14][15] The LAA and CAA synthesis can be achieved either by…”

mentioning

confidence: 99%

Moth flame optimization based design of linear and circular antenna array for side lobe reduction

Das

Mandal

Ghoshal

et al. 2018

Int J Numerical Modelling

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This paper presents an accurate approach to design a symmetrical linear antenna array (LAA) and a non-uniformly excited single ring circular antenna array (CAA) to improve the far-field radiation characteristics. The far-field radiation pattern is improved with lower side lobe level (SLL) which is essential for the reduction of interference in the entire side lobe regions. A recently proposed meta-heuristic based optimization algorithm called moth flame optimization (MFO) is applied to determine the optimal sets of current excitation weights and the inter-element spacing among the array elements to reduce the SLL. In this context, 10-element and 16-element LAA and 8-element, 10element, and 12-element CAA design examples are presented by optimizing the array parameters. The simulation results obtained by using MFO algorithm based approach yield a considerable improvement in SLL and some marked improvement of half power beam width with respect to the uniform array pattern and those of the recently reported literature. KEYWORDS circular antenna array, half power beamwidth, linear antenna array, moth flame optimization, side lobe level | INTRODUCTIONAccurate design and synthesis of antenna arrays have a significant role in a modern-day communication system. A lot of research work for the design and synthesis of antenna arrays have been carried out over the past few decades to improve the radiation pattern of the antenna. The radiation pattern depends on the antenna array parameters, eg, the geometrical configuration of the array, inter-element spacing and the current excitation weights of each array element. The increasing traffic in the electromagnetic environment prompts to design the antenna array with a lower side lobe level (SLL) and narrower half power beam width (HPBW). A lower SLL is required to avoid the interference with the other systems operating in the same frequency band. On the other hand, a narrow HPBW is required for high directivity which is essential for long distance communication. However, the design of antenna array with low SLL and narrow HPBW is a challenging task because an array with low SLL does not produce a narrow HPBW and vice-versa, 1,2 ie, the performance cannot be improved simultaneously maintaining both the criterion of antenna array design.The linear and circular antenna arrays (CAAs) are widely used in many high-performance radio systems like radar, sonar, air and space navigation, underground propagation etc. Extensive research on linear antenna array (LAA) and CAA synthesis have been reported in the literature. [3][4][5][6][7][8][9][10][11][12][13][14][15] The LAA and CAA synthesis can be achieved either by

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Circular and Concentric Circular Antenna Array Synthesis Using Cat Swarm Optimization

Cited by 43 publications

References 24 publications

An optimal far‐field radiation pattern synthesis of time‐modulated linear and concentric circular antenna array

An optimal far‐field radiation pattern synthesis of time‐modulated linear and concentric circular antenna array

Design of Non-Uniformly Spaced Circular Arrays of Parasitic Dipoles for Lower Side Lobe Level with Maximum Directivity

Moth flame optimization based design of linear and circular antenna array for side lobe reduction

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