Design of a Broadband Cosecant Squared Pattern Reflector Antenna Using IWO Algorithm

Dastranj, Aliakbar; Abiri, Habibollah; Mallahzadeh, Alireza

doi:10.1109/tap.2013.2254439

Cited by 38 publications

(33 citation statements)

References 17 publications

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“…Note that the synthesized reflector has a smooth surface. As experienced in previous works , the designed reflector antenna system can be fabricated with a mechanical accuracy of

0.01 λ

. The gain loss due to surface deviation (error) is as follows :

k_{normalg} = \cos^{2} true(720^{\circ} \frac{δ^{'}}{λ} true)

where k g and

δ^{'}

are the gain loss and surface deviation, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…To obtain the desired radiation characteristics over the entire [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] GHz operating bandwidth, several weightings for the sampling frequencies have been applied. Table III shows the optimum weighting values versus frequency, obtained with numerous simulations.…”

Section: B Object (Fitness) Functionmentioning

confidence: 99%

“…Furthermore, it makes antenna synthesis flexible to achieve extra desired features such as high directivity, low sidelobe levels (SLL), and small ripples in the shaped beam region. As a result, a cosecant squared pattern with a wide coverage beyond 45 in the elevation plane and a pencil beam with half power beam width (HPBW) beyond 4 in the azimuth plane over the entire [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] GHz bandwidth is achieved. Moreover, the ripples in the cosecant squared region and the elevation-and azimuth-SLLs, are less than 0.2, 223, and 221 dB, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Two-dimensional synthesis and optimization of a broadband shaped beam reflector antenna using IWO and PSO algorithms

Dastranj

Abiri

Mallahzadeh

2014

Int J RF and Microwave Comp Aid Eng

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A new technique for broadband shaped beam reflector antennas synthesis is presented. The surface of the shaped reflector is represented by a set of orthogonal Jacobi-Fourier expansion functions. To achieve a cosecant squared pattern in the elevation plane and a pencil beam in the azimuth plane, the expansion coefficients are optimized using invasive weed optimization and particle swarm optimization algorithms. High accuracy is achieved by combining optimization tools and analysis methods such as physical optics and integral equation. Besides, in the optimization procedures, a complex object function is used to achieve the desired performance over the entire 26-40 GHz operating bandwidth. The simulation results via FEKO and CST Microwave Studio software packages prove the validity and versatility of this technique for solving shaped reflector synthesis problems. There are several features that distinguish this technique from the previous methods. First of all is the wide bandwidth. The second is its ability to shape the radiation patterns in the elevation and azimuth planes simultaneously (two-dimensional synthesis). Moreover, compared with other techniques, the proposed method allows achieving extra desired features such as high directivity, low sidelobe levels, and small ripples in the shaped beam region.

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“…Note that the synthesized reflector has a smooth surface. As experienced in previous works , the designed reflector antenna system can be fabricated with a mechanical accuracy of

0.01 λ

. The gain loss due to surface deviation (error) is as follows :

k_{normalg} = \cos^{2} true(720^{\circ} \frac{δ^{'}}{λ} true)

where k g and

δ^{'}

are the gain loss and surface deviation, respectively.…”

Section: Resultsmentioning

confidence: 99%

Section: B Object (Fitness) Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two-dimensional synthesis and optimization of a broadband shaped beam reflector antenna using IWO and PSO algorithms

Dastranj

Abiri

Mallahzadeh

2014

Int J RF and Microwave Comp Aid Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…The illustrated gain enhancement is indepenent of the height of the central element. The second approach to achieve a uniform gain is to sythesize an aperture which would yield a cosecant theta pattern, similar to aircraft tracking radar antennas but the synthesis of the aperture would be a challenging task and typically electrically larger apertures lead to high gain and poor coverage. The third appraoch: leaky wave antenna suggested in Reference could also be redesigned for uniform gain at the expense of variation in the frequency of operation.…”

Section: Dielectric and Metamaterial‐loaded Tsamentioning

confidence: 99%

Pattern diversity of path loss compensated antennas for 5G base stations

Karthikeya

Abegaonkar

Koul

2019

Int J RF Microw Comput Aided Eng

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In this article, a tapered slot antenna (TSA) operating from 27 to 29.8 GHz with an endfire gain of 9 dBi and high pattern integrity is presented. The gain specifications for path loss compensation on ground for a ceiling mounted millimeter wave base station is computed and the gain of the antenna elements with beam angled at ±45° was found to be 12 dBi. To enhance gain with minimal physical footprint, a combination of dielectric loading and electrical resonator metamaterial unit cells were integrated to the proposed TSA to achieve the expected gain enhancement of 3 dB across the band, operating in the same frequency band with aperture efficiency greater than 73% and a 1 dB gain bandwidth of 20.7%. A compact stacking topology for pattern diversity of all three antenna elements for path loss compensation is also investigated. The base station has a coverage of ±60° with uniform illumination and mutual coupling lesser than 35 dB. The detailed simulated and measured results are presented.

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“…Recently, a developed hybrid IWO with iterative Fourier technique (IWO-IFT) has been also proposed for the synthesis of a large planar thinned array [26]. Some other hybrid versions of IWO are also applied to the design of antenna arrays in [27][28][29][30]. In the same way, a discrete IWO (DIWO) has been developed for cooperative multiple task assignment of unmanned aerial vehicles [31].…”

Section: Introductionmentioning

confidence: 99%

Optimum design of non-uniform symmetrical linear antenna arrays using a novel modified invasive weeds optimization

Kenane

Djahli

2016

Archives of Electrical Engineering

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This paper presents a new modified method for the synthesis of non-uniform linear antenna arrays. Based on the recently developed invasive weeds optimization technique (IWO), the modified invasive weeds optimization method (MIWO) uses the mutation process for the calculation of standard deviation (SD). Since the good choice of SD is particularly important in such algorithm, MIWO uses new values of this parameter to optimize the spacing between the array elements, which can improve the overall efficiency of the classical IWO method in terms of side lobe level (SLL) suppression and nulls control. Numerical examples are presented and compared to the existing array designs found in the literature, such as ant colony optimization (ACO), particle swarm optimization (PSO), and comprehensive learning PSO (CLPSO). Results show that MIWO method can be a good alternative in the design of non-uniform linear antenna array.

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Design of a Broadband Cosecant Squared Pattern Reflector Antenna Using IWO Algorithm

Cited by 38 publications

References 17 publications

Two-dimensional synthesis and optimization of a broadband shaped beam reflector antenna using IWO and PSO algorithms

Two-dimensional synthesis and optimization of a broadband shaped beam reflector antenna using IWO and PSO algorithms

Pattern diversity of path loss compensated antennas for 5G base stations

Optimum design of non-uniform symmetrical linear antenna arrays using a novel modified invasive weeds optimization

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