Frequency-Domain Analyses of Nonlinearly Loaded Antenna Arrays Using Simulated Annealing Algorithms

Lee, Kun Chou

doi:10.2528/pier04101501

Cited by 22 publications

(26 citation statements)

References 13 publications

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“…Otherwise it is rejected. This procedure is for the purpose of reducing the chance of getting stuck in local solutions [2,12]. 5) To avoid losing the current best solution due to accepting new solution by probability, set a variable to preserve the current best solution.…”

Section: The Advantages Of the Samentioning

confidence: 99%

“…Sparse arrays are facing nonlinear and complicate problems, and traditional numerical computation methods can not get the desirable solution. So more and more artificial intelligence methods are introduced in the field, such as dynamic programming algorithm [9], simulated annealing algorithm [2,[6][7][8]10], particle swarm algorithm [5], genetic algorithm [1,3,4,11], etc. Compared with linear and planar arrays, conformal cylindrical arrays have curved structure and are conformal to the carrier, so the synthesis problem of this type of antenna array is multidimensional and nonlinear problem, which is more difficult than the synthesis of linear and planar array [5].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Sparse Cylindrical Arrays Using Simulated Annealing Algorithm

Xie¹,

Ke-song²,

He³

2009

PIER Letters

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Abstract-In this paper, simulated annealing algorithm (SA) is applied to the synthesis of cylindrical conformal arrays in order to suppress the peaks of side lobes by acting on the elements' positions. There are multiple optimization constraints including the number of elements, aperture and minimum element spacing. A constraint matrix is designed to make the solution meet the restriction on the minima distance between elements, and the individual matrix which forms on the basis of constraint matrix is used to express array configurations. The SA does not act on the elements' positions directly but on the variables in a smaller solution space, this indirect description method makes the SA more computationally efficient. The simulation results confirm the great efficiency and robustness of the proposed method.

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Section: The Advantages Of the Samentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Sparse Cylindrical Arrays Using Simulated Annealing Algorithm

Xie¹,

Ke-song²,

He³

2009

PIER Letters

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“…Therefore, it is desirable to design a loading network to yield a specified radiation [7]. In the past years a great deal of interest has been shown in the development of microstrip antennas [8,10,11,13,14,16]. Some work has been done by others on the effects of loading an element with short circuits, with varactor diodes, with slots [6,10].…”

Section: Introductionmentioning

confidence: 99%

“…The theoretically and with simulation observed effects of loading a microstrip radiator with a variable loading positions are presented. A specified radiation pattern from the antenna can be synthesized by choosing the appropriate characteristic impedance and reactive loads at the load terminals of the antenna [6,16,17]. Different load configurations have been described in this paper.…”

Section: Introductionmentioning

confidence: 99%

High Gain Rectangular Broad Band Microstrip Antenna With Embedded Negative Capacitor and Chip Resistor

Kaya¹

2008

PIER

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Abstract-Various communication systems require single radiating element operating in wide band. In this paper, a novel active integrated single microstrip antenna is proposed and its radiation pattern and gain performance is optimized with analysis. The reactive loading is provided by a negative capacitor section embedded within the patch. The active negative capacitor is made of a field-effect transistor that exhibits negative resistance as well as capacitance. It can, therefore, compensate the loss of an inductor. A microstrip patch operating at 10.5 GHz having 12.2% bandwidth has been utilized as a reference antenna. With the proposed antenna design, the antenna radiation pattern can be as large as about 1.5 times that of an antenna without reactive loading. In addition, it has been shown that active compensation significantly improves the matching level.

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“…Hence, loading of scatterers can be used to control scattered field [1][2][3][4][5][6][7][8][9][10][11]. One of the conventional scatterers with load impedance is linearly loaded dipole antenna [12][13][14][15] in which the resulted scattered field is a strongly nonlinear function of dipole diameter and load impedance.…”

Section: Introductionmentioning

confidence: 99%

A Fuzzy Model for Computing Back-Scattering Response From Linearly Loaded Dipole Antenna in the Frequency Domain

Ostadzadeh¹,

Tayarani²,

Soleimani³

2008

PIER

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Abstract-This study includes three parts: First is fuzzy modeling of scattered field from unloaded dipole antenna. In second step a fuzzy model for scattered field from a linearly loaded thin dipole antenna is introduced. In both parts, knowledge bases of diameter and load impedance are separately extracted and saved as very simple curves. It is shown that the behavior of scattering dipole antenna is well approximated with the single transmitting dipole antenna obtained in our previous study. In the third step, using the concept of spatial membership functions, two obtained knowledge bases are combined so that the spatial knowledge base including simultaneous effects of diameter and load impedance is extracted. As a result, these spatial knowledge base as well as the behavior of single transmitting dipole antenna are used instead of time consuming and repetitive computations in accurate methods. With the use of this spatial knowledge and behavior of single transmitting dipole antenna, the scattered field from dipole antenna for any load impedance and diameter is predicted. Comparing the predicted results with accurate ones shows an excellent agreement. Moreover the computation time is considerably reduced.

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Frequency-Domain Analyses of Nonlinearly Loaded Antenna Arrays Using Simulated Annealing Algorithms

Cited by 22 publications

References 13 publications

Synthesis of Sparse Cylindrical Arrays Using Simulated Annealing Algorithm

Synthesis of Sparse Cylindrical Arrays Using Simulated Annealing Algorithm

High Gain Rectangular Broad Band Microstrip Antenna With Embedded Negative Capacitor and Chip Resistor

A Fuzzy Model for Computing Back-Scattering Response From Linearly Loaded Dipole Antenna in the Frequency Domain

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