Synthesis of Thinned Concentric Circular Antenna Arrays Using Modified TLBO Algorithm

Luo, Zailei; He, Xingui; Chen, Xuedong; Luo, Xichun; Li, Xiaoqing

doi:10.1155/2015/586345

Cited by 13 publications

(8 citation statements)

References 25 publications

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“…Suatu susunan antena sirkular yang terpisah dengan jarak yang sama serta dieksitasi dengan catuan yang seragam akan memiliki direktivitas yang tinggi (lebar berkas yang sempit) namun juga memiliki intensitas side lobe yang tinggi [7]- [8]. Side lobe tersebut muncul akibat grating lobe pada pola susunan (array pattern) yang mulai muncul ketika dua buah elemen pada susunan antena terpisah pada jarak yang melebihi setengah panjang gelombang [9].…”

Section: Pendahuluanunclassified

Pengaruh Elemen Sentral Pada Susunan Antena Sirkular Untuk Sistem Teleskop Radio Transit

Anwar¹,

Islam

Misran

et al. 2018

JETT

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Susunan antena sirkular telah digunakan pada berbagai aplikasi, termasuk untuk system telekomunikasi dan dalam sistem teleskop radio. Artikel ini membahas pengaruh elemen sentral pada lebar berkas susunan antena sirkular untuk sistem teleskop radio transit. Analisis ini diperoleh dari simulasi dan dibandingkan dengan model teoritis sistem susunan antena 2-elemen dari pekerjaan sebelumnya. Hasil percobaan menunjukkan bahwa sistem susunan antena dengan elemen sentral memiliki lebar berkas yang lebih lebar dibandingkan dengan susunan antena tanpa elemen pusat, dengan intensitas side lobe yang lebih rendah. Karakteristik ini cocok untuk susunan antena yang akan diimplementasikan dalam sistem teleskop radio transit.

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Section: Pendahuluanunclassified

Pengaruh Elemen Sentral Pada Susunan Antena Sirkular Untuk Sistem Teleskop Radio Transit

Anwar¹,

Islam

Misran

et al. 2018

JETT

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“…; M . Assuming that all elements are isotropic sources (in all the rings), then the array factor of the considered configuration on the x-y plane with central element feeding (Figure 1) may be written as the following relation [1,4,5]: α mi the phase difference between the individual elements in the array given by:…”

Section: Problem Formulation: Concentric Rings Array Modelmentioning

confidence: 99%

“…Its benefits including the flexibility in array pattern synthesis and design both in narrowband and broadband beam-forming applications especially at the base stations (in mobile radio communications system) [2]. However, uniformly excited and equally spaced circular ring array offers high directivity but suffers from high side lobe level (SLL) [1,5].…”

Section: Introductionmentioning

confidence: 99%

Uniform and Concentric Circular Antenna Arrays Synthesis for Smart Antenna Systems Using Artificial Neural Network Algorithm

Hamdi¹,

Selma²,

Aguili³

2016

PIER B

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Abstract-Recently, researchers were interested in neural algorithms for optimization problems for several communication systems. This paper shows a novel algorithm based on neural technique presented to enhance the performance analysis of beam-forming in smart antenna technology using N elements for Uniform Circular Array (UCA) and Concentric Circular Array (CCA) geometries. To demonstrate the effectiveness and reliability of the proposed approach, simulation results are carried out in MATLAB. The radiators are considered isotropic, and hence mutual coupling effects are ignored. The proposed array shows a considerable improvement against the existing structures in terms of 3-D scanning, size, directivity, HPBW and SLL reduction. The results show that multilayer feed-forward neural networks are robust and can solve complex antenna problems. However, artificial neural network (ANN) is able to generate very fast the results of synthesis by using generalization with early stopping method. Important gain in the running time and memory used is obtained using this latter method for improving generalization (called early stopping). To validate this work, several examples are shown.

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“…To overcome this problem, the evolutionary algorithm is applied to work out the composite non-linear and non-differentiable problems [19][20][21][22][23][24][25][26]. There are many evolutionary algorithms which are used for different fields of engineering [27][28][29][30][31][32][33][34][35] and the optimisation of antenna problem [36][37][38][39][40]. Development of element level antenna like the dielectric resonator antenna also has been reported in [41].…”

Section: Introductionmentioning

confidence: 99%

Control Parameter Based Comparative Study of Radiation Properties of TMCCAA and TMHSCAA

2020

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Two different configurations have been considered for the optimal design of radiated electric field pattern characteristics of antenna arrays. The array patterns of the isotropic elements of two circular array geometries are considered. Time-modulated concentric circular antenna array (TMCCAA) and time-modulated half symmetric circular antenna array (TMHSCAA) have been dealt with for the comparative analysis of control parameters of the radiation properties of the antenna array. Collective animal behaviour (CAB), an evolutionary approach, is applied as the optimisation tool. The effect of different control parameters of the radiation pattern of TMCCAA is compared by taking two different cases, Case-1 and Case-2. Optimisation of the spacing between each element in each ring indirectly leads to the optimisation of several elements in each ring. For TMCCAA, 279 isotropic elements in an array are considered including one element at the centre. In the second array, the effect of different control parameters of the radiation pattern of Time-Modulated Half Symmetric Circular Antenna Array (TMHSCAA) is compared by taking again two different cases. Simulation results obtained for 20-elements TMHSCAA with uniform amplitude and spacing are analysed. Optimized SLL values obtained for the Case-1 and Case-2 of TMCCAA are-24.68 dB and-46.15 dB, respectively.

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Synthesis of Thinned Concentric Circular Antenna Arrays Using Modified TLBO Algorithm

Cited by 13 publications

References 25 publications

Pengaruh Elemen Sentral Pada Susunan Antena Sirkular Untuk Sistem Teleskop Radio Transit

Pengaruh Elemen Sentral Pada Susunan Antena Sirkular Untuk Sistem Teleskop Radio Transit

Uniform and Concentric Circular Antenna Arrays Synthesis for Smart Antenna Systems Using Artificial Neural Network Algorithm

Control Parameter Based Comparative Study of Radiation Properties of TMCCAA and TMHSCAA

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