Optimum element lengths for Yagi-Uda arrays

Chen, C.; Cheng, David K.

doi:10.1109/tap.1975.1141001

Cited by 106 publications

(71 citation statements)

References 6 publications

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“…11. The F/B ratio at 5.5 GHz is 18 dB and is much higher than pervious works [4][5][6][7][8][9][10][11][12].…”

Section: Resultsmentioning

confidence: 73%

“…These types of antennas find their use in many applications such as industrial, medical, radar and wireless communications. The microstrip Yagi-Uda array consists of a driven microstrip antenna along with several parasitic microstrip antennas which are arranged on the same substrate surface in a way that the overall antenna characteristics are enhanced [8]. It is clear that in array applications, the effect of mutual coupling is usually undesirable, because it reduces the antenna gain, raises the side lobe level, etc.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Wide-Band Microstrip Yagi-Uda Array Antenna for Wlan Applications

Bemani,

Nikmehr

2009

PIER B

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Abstract-This paper presents a design of Wide-Band Microstrip Yagi-Uda antenna with high gain and high front to back (F/B) ratio. Numerical and measured results of our design show more than 18 dB front to back ratio at 5.5 GHz and no backward radiation at 5.2 GHz. An impedance bandwidth of 22.05% was achieved around 5.5 GHz. The antenna gain (10-12.4 dBi) can be varied to be suitable for various applications. Measured return loss and radiation pattern of this antenna is presented to validate the results of simulations by two methods. The first method based on finite element method (FEM) and the second one based on finite integral technique (FIT) were used to analyze antenna structure, and subsequently the Genetic Algorithm (GA) was applied by using HFSS simulator to obtain the optimized parameters. In order to find the best design method for this antenna, the effect of distance between the parasitic elements of proposed antenna was studied. Finally two microstrip Yagi-Uda array antennas were combined to increase the gain of antenna. To demonstrate the major benefits, a comparison of our initial and final designs of Yagi-Uda antenna is provided.

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“…11. The F/B ratio at 5.5 GHz is 18 dB and is much higher than pervious works [4][5][6][7][8][9][10][11][12].…”

Section: Resultsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

A Novel Wide-Band Microstrip Yagi-Uda Array Antenna for Wlan Applications

Bemani,

Nikmehr

2009

PIER B

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“…Since its invention, continuous efforts have been put in optimizing its design for desired gain, impedance, SLL and bandwidth, etc., requirements using different optimization techniques based on traditional mathematical approaches [24,4,8,25,7,6,9] and Artificial Intelligence (AI) techniques [16,35,34,3,19,31,30].…”

Section: Introductionmentioning

confidence: 99%

“…Bojsen et al in [4] proposed another optimization technique to calculate the maximum gain of Yagi-Uda antenna arrays with equal and unequal spacings between adjoining elements. Cheng et al in [7] and [6] have used optimum wire lengths and their spacings to maximize the gain of the Yagi-Uda antenna. In [9], Cheng has proposed optimum design of Yagi-Uda antenna where antenna gain function is highly non-linear.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective Gain-Impedance Optimization of Yagi-Uda Antenna using NSBBO and NSPSO

Singh¹,

Mittal²,

Sachdeva³

2012

IJCA

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Biogeography-Based Optimization (BBO) is a population based algorithm which has shown impressive performance over other Evolutionary Algorithms (EAs). BBO algorithm is based on the study of distribution of biological organisms over space and time. YagiUda antenna design is most widely used antenna at VHF and UHF frequencies due to high gain, directivity and ease of construction. However, designing a Yagi-Uda antenna, that involves determination of optimal wire-lengths and their spacings, is highly complex and non-linear engineering problem. It further complicates as multiple objectives, viz. gain, and impedance, etc., are required to be optimized due to their conflicting nature, i.e., reactive antenna impedance increases significantly as antenna gain is intended to increase. In this paper Non-dominated Sorting BBO (NSBBO) is proposed and where standard and blended variants of BBO are investigated in optimizing six-element Yagi-Uda antenna designs for multiple objectives, viz., gain and impedance, where ranking of potential solutions is done using non-dominated sorting. The simulation results of BBO variants and Particle Swarm Optimization (PSO) are presented in the ending sections of the paper that depict clearly that NSBBO with blended migration operator is best option among all.

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“…However, the antenna size is still large (5.2λ × 4λ). The Yagi-Uda antenna was used excessively as a good candidate for high gain [9][10][11]. However, this antenna has limited gain up to 18 dB range, which can sometimes prove limiting in some remote applications.…”

Section: Introductionmentioning

confidence: 99%