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Proceedings ArticleDOI

An Optimal Multiband Compact Modified Crinkle Fractal Antenna for Wireless Applications

TL;DR: In this paper, an optimal multiband compact modified crinkle fractal antenna is proposed on FR-4 substrate having dimension of $14.5\ \mathbf{mm} \times 1 \mathBF{mm]$, dielectric constant 4.4, and loss tangent of 0.02.
Abstract: An optimal multiband compact modified crinkle fractal antenna is proposed in this report which is designed on FR-4 substrate having dimension of $14\ \mathbf{mm} \times 12.5\ \mathbf{mm} \times 1 \mathbf{mm}$ , dielectric constant 4.4, and loss tangent of 0.02. Proposed fractal antenna is optimized using dragonfly optimization (DO) and resonates at 1.3584 GHz, 1.9925GHz, 2.5714 GHz, 4.3910 GHz, 5.1629 GHz, 5.6591 GHz, 6.2932 GHz, 7.6165 GHz, 8.3609 GHz, 9.2431 GHz, and 10.4010GHz. Proposed antenna is characterized on the basis of various performance parameters like return loss, VSWR, radiation pattern, gain and bandwidth.
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Journal ArticleDOI
04 Jun 2020
TL;DR: In this article, the dependence of the base frequency and the reflection coefficient on the dipole wire length and scale is analyzed, and it is shown that it is possible to distinguish a family of antennas operating at a given (identical) base frequency.
Abstract: Koch-type wire dipole antennas are considered herein. In the case of a first-order prefractal, such antennas differ from a Koch-type dipole by the position of the central vertex of the dipole arm. Earlier, we investigated the dependence of the base frequency for different antenna scales for an arm in the form of a first-order prefractal. In this paper, dipoles for second-order prefractals are considered. The dependence of the base frequency and the reflection coefficient on the dipole wire length and scale is analyzed. It is shown that it is possible to distinguish a family of antennas operating at a given (identical) base frequency. The same length of a Koch-type curve can be obtained with different coordinates of the central vertex. This allows for obtaining numerous antennas with various scales and geometries of the arm. An algorithm for obtaining small antennas for Wi-Fi applications is proposed. Two antennas were obtained: an antenna with the smallest linear dimensions and a minimum antenna for a given reflection coefficient.

14 citations


Cites methods from "An Optimal Multiband Compact Modifi..."

  • ...In addition, some other fractal structures are also used, including the Minkowski curve [23], Spidron fractal [24], crinkle curve [25], Peano fractal [26], and many other curves....

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References
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Proceedings ArticleDOI
06 Aug 2002
TL;DR: A concept for the optimization of nonlinear functions using particle swarm methodology is introduced, and the evolution of several paradigms is outlined, and an implementation of one of the paradigm is discussed.
Abstract: A concept for the optimization of nonlinear functions using particle swarm methodology is introduced. The evolution of several paradigms is outlined, and an implementation of one of the paradigms is discussed. Benchmark testing of the paradigm is described, and applications, including nonlinear function optimization and neural network training, are proposed. The relationships between particle swarm optimization and both artificial life and genetic algorithms are described.

35,104 citations


"An Optimal Multiband Compact Modifi..." refers background or methods in this paper

  • ...It was introduced by Kennedy J, Eberhart R in 1995 [12] and now days it is very popular among antenna design engineers....

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  • ...Two optimization method are used to optimize same objective function given in equation (7), one of them is PSO which is widely used in the field of electromagnetic and antenna designing [12][18], while as second one DFO is newly introduced method [10] and used to optimize the problem of antenna in [11]....

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  • ...PSO is a widely used optimization technique in the field of electromagnetic and antenna technology, introduced in 1995 by James Kennedy and Russell Eberhart [12]....

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Journal ArticleDOI
TL;DR: The results of DA and BDA prove that the proposed algorithms are able to improve the initial random population for a given problem, converge towards the global optimum, and provide very competitive results compared to other well-known algorithms in the literature.
Abstract: A novel swarm intelligence optimization technique is proposed called dragonfly algorithm (DA). The main inspiration of the DA algorithm originates from the static and dynamic swarming behaviours of dragonflies in nature. Two essential phases of optimization, exploration and exploitation, are designed by modelling the social interaction of dragonflies in navigating, searching for foods, and avoiding enemies when swarming dynamically or statistically. The paper also considers the proposal of binary and multi-objective versions of DA called binary DA (BDA) and multi-objective DA (MODA), respectively. The proposed algorithms are benchmarked by several mathematical test functions and one real case study qualitatively and quantitatively. The results of DA and BDA prove that the proposed algorithms are able to improve the initial random population for a given problem, converge towards the global optimum, and provide very competitive results compared to other well-known algorithms in the literature. The results of MODA also show that this algorithm tends to find very accurate approximations of Pareto optimal solutions with high uniform distribution for multi-objective problems. The set of designs obtained for the submarine propeller design problem demonstrate the merits of MODA in solving challenging real problems with unknown true Pareto optimal front as well. Note that the source codes of the DA, BDA, and MODA algorithms are publicly available at http://www.alimirjalili.com/DA.html.

1,897 citations


"An Optimal Multiband Compact Modifi..." refers background or methods in this paper

  • ...If there is no neighboring search agent (Dragonfly) than search agent will update its location by using Levy flight, according to the equation [10] given below:...

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  • ...Where, t represents the current iteration To improve the randomness, stochastic behavior and exploration of the artificial dragonflies, the concept of random walk called levy flight is proposed in the work [10]....

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  • ...In [10] a new optimization method is introduced by S....

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  • ...Two optimization method are used to optimize same objective function given in equation (7), one of them is PSO which is widely used in the field of electromagnetic and antenna designing [12][18], while as second one DFO is newly introduced method [10] and used to optimize the problem of antenna in [11]....

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  • ...Position vectors are computed after calculating the step vector in [10] by the following equation:...

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Journal ArticleDOI
TL;DR: Fractal antenna engineering has been primarily focused in two areas: the first deals with the analysis and design of fractal antenna elements, and the second concerns the application of Fractal concepts to the design of antenna arrays as discussed by the authors.
Abstract: Recent efforts by several researchers around the world to combine fractal geometry with electromagnetic theory have led to a plethora of new and innovative antenna designs. In this report, we provide a comprehensive overview of recent developments in the rapidly growing field of fractal antenna engineering. Fractal antenna engineering research has been primarily focused in two areas: the first deals with the analysis and design of fractal antenna elements, and the second concerns the application of fractal concepts to the design of antenna arrays. Fractals have no characteristic size, and are generally composed of many copies of themselves at different scales. These unique properties of fractals have been exploited in order to develop a new class of antenna-element designs that are multi-band and/or compact in size. On the other hand, fractal arrays are a subset of thinned arrays, and have been shown to possess several highly desirable properties, including multi-band performance, low sidelobe levels, and the ability to develop rapid beamforming algorithms based on the recursive nature of fractals. Fractal elements and arrays are also ideal candidates for use in reconfigurable systems. Finally, we provide a brief summary of recent work in the related area of fractal frequency-selective surfaces.

1,055 citations


"An Optimal Multiband Compact Modifi..." refers background in this paper

  • ...All the simulated results proves that increase in number of iteration increase the number of resonating frequency bands as mentioned in report [6] [17] and also the resonating frequency reduced considerably without increasing the size of antenna, for 1st iteration it resonates at 11....

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Journal ArticleDOI
TL;DR: In this article, the multiband behavior of the fractal Sierpinski (1915) antenna is described and compared to the well-known single-band bow-tie antenna.
Abstract: The multiband behavior of the fractal Sierpinski (1915) antenna is described. Due to its mainly triangular shape, the antenna is compared to the well-known single-band bow-tie antenna. Both experimental and numerical results show that the self-similarity properties of the fractal shape are translated into its electromagnetic behavior. A deeper physical insight on such a behavior is achieved by means of the computed current densities over the antenna surface, which also display some similarity properties through the bands.

754 citations


"An Optimal Multiband Compact Modifi..." refers background in this paper

  • ...Fractal is the objects which possesses the property of self similarity and repeat itself at different scale [2]....

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  • ...Fractal geometry is also responsible for multiband behavior of antenna [2] [6]....

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Journal ArticleDOI
TL;DR: In this article, a fractal spatial arrangement of array elements and the fractal design of array factors is described for multiband operation. But the analysis is focused in two different approaches: the fractals spatial arrangement and array factor design.
Abstract: Most array factor design techniques are highly dependent on the operating wavelength. In this paper, a novel technique based on fractal structures is described for multiband operation. The analysis is focused in two different approaches: the fractal spatial arrangement of array elements and the fractal design of array factors. Although the patterns of fractal arrays show some interesting similarity properties at several bands, the directivity is not held constant through the bands. Nevertheless, such structures have been shown to be useful for designing low side-lobe arrays with equally weighted current elements. On the other hand, the fractal array factors presented do keep the same shape at several bands because they are designed as selfsimilar curves. The arrays that would synthesize such patterns present a characteristic power-law current distribution analogous to the spectral distribution of the bandlimited fractal Weierstrass function.

172 citations


"An Optimal Multiband Compact Modifi..." refers background in this paper

  • ...In [3] first effort was made to explore the multiband behavior of fractal structure as radiating element....

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