Compact Circularly Polarized Wide-Beamwidth Fern-Fractal-Shaped Microstrip Antenna for Vehicular Communication

Mondal, Tapas; Maity, Sandip; Ghatak, Rowdra; Chaudhuri, Sheli Sinha

doi:10.1109/tvt.2018.2824841

Cited by 54 publications

(33 citation statements)

References 20 publications

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“…The microstrip feedline with 50 Ω characteristic impedance is used for providing the feed and excitation to the antenna. All of these slotted recurrent coils tend to provide the enhancement of radiation pattern, gain as well as impedance bandwidth to this proposed antenna [44].…”

Section: Antenna Design/geometrymentioning

confidence: 99%

Optimization of inscribed hexagonal fractal slotted microstrip antenna using modified lightning attachment procedure optimization

Anand

Chawla

2020

Int. J. Microw. Wireless Technol.

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An inscribed hexagonal fractal slotted patch antenna with some additional geometry and slots is proposed for the optimization in this paper. This research work is concerned with the optimization of this slotted fractal antenna with the help of the curve-fitting method in conjunction with the modified version of Lightning Attachment Procedure Optimization (MLAPO) technique. The data required for the curve-fitting technique and for the optimization technique have been obtained by varying some of the parameters of the proposed antenna. Different equations are developed to know the relations between these parameters of the proposed antenna. The MLAPO technique is applied thereafter to calculate the different optimized geometrical parameters to optimize the bandwidth for the proposed antenna. The optimized geometrical parameters are verified with the help of a parametric variation to justify the reliable optimization. The bandwidth obtained by the MLAPO technique has been found to be better than that obtained by PSO and normal LAPO algorithm. The prototype of the optimized antenna is fabricated and the experimental results are found to be compatible with the results obtained by simulation. The proposed optimized antenna may be utilized in various applications in C and X bands.

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Section: Antenna Design/geometrymentioning

confidence: 99%

Optimization of inscribed hexagonal fractal slotted microstrip antenna using modified lightning attachment procedure optimization

Anand

Chawla

2020

Int. J. Microw. Wireless Technol.

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“…3, the proposed antenna is firstly simulated by implanting it into a three-layer 'human body' model at a depth of dp1 from the muscle surface with the cylindrical layer dimensions approximating those of the human body as shown in Table 2. Due to the fact that the dielectric properties of tissues are dispersive, as listed in Table 3, the permittivity and conductivity of every tissue are given at the centre frequencies of 403 MHz and 2.44 GHz, respectively [31]. Furthermore, to reduce the unwanted EM coupling to nearby tissues and prevent the rejection of the implant, the proposed antenna is surrounded by a 70-μm-thick biocompatible material of alumina with the high relative dielectric constant of ε r = 9.2 and the low loss tangent of tan δ = 0.008, thus decreasing the mismatch between the insulated antenna and the ambient tissues.…”

Section: Setup Of Simulationmentioning

confidence: 99%

“…After preliminary simulations and optimisation with an HFSS approximate three-layer 'human body', the radiation characteristics of the proposed antenna are further verified in the more realistic CST heterogeneous male Zubal phantom, which is closer to the actual conditions. In the Zubal phantom, that is shared by Yale University [32,33], the dielectric parameters of each tissue at the frequencies of 403 MHz and 2.44 GHz are set according to Cole-Cole formulation [31]. For proof-of-concept demonstration purposes, as displayed in Fig.…”

Section: Setup Of Simulationmentioning

confidence: 99%

Novel coated differentially fed dual‐band fractal antenna for implantable medical devices

Fan

Liu

et al. 2019

IET Microwaves, Antennas & Propagation

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A novel differentially fed fractal antenna coated with a layer of a dielectric film and operating at two bands of Medical Implant Communication Services 402–405 MHz and Industrial, Scientific, and Medical 2.4–2.48 GHz, is investigated to enable sufficient data transmission rates, while featuring a ‘mode‐control’ signal to prolong the battery life. The symmetrical fractal technology of Hilbert curve is employed to miniaturise the dimension. To facilitate interfacing with peripheral integrated circuits, differentially feeding is adopted. To demonstrate how common‐mode noises are suppressed, for the first time, a detailed analysis about the noise suppression of the differential configuration with two feedings is presented. A layer of thin film is coated around the proposed antenna to isolate the effect of human tissues and alleviate the electromagnetic coupling with human body. Moreover, to draw a design methodological guideline, the key geometrical parameters are analysed numerically and theoretically. Health safety considerations, radiation performance, and link budgets are also discussed to validate the proposed antenna's applicability in biomedical telemetry.

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“…While preservation of high CP purity along with satisfying other electrical and field performance requirements is already challenging, ensuring compact size is an additional contribution to the design complexity. Several miniaturization techniques based on topological modifications of the antenna structure have been proposed, including the use of slots and fractals [7], defected ground structure [8], fractal metasurfaces and fractal resonators [9], or mushrooms and reactive impedance surfaces (RIS) [10]. These techniques have been successful in working out a compromise between the compact size and performance figures of CP antenna.…”

Section: Introductionmentioning

confidence: 99%

Explicit Size-Reduction of Circularly Polarized Antennas Through Constrained Optimization With Penalty Factor Adjustment

Mahrokh

Koziel

2021

IEEE Access

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Modern communication systems of high data capacity incorporate circular polarization (CP) as the preferred antenna radiation field configuration. In many applications, integration of the system circuitry with antennas imposes size limitations on CP radiators, which makes their development process a challenging endeavor. This can be mitigated by means of simulation-driven design, specifically, constrained numerical optimization. Majority of the performance-related constraints are expensive to evaluate, i.e. require full-wave electromagnetic (EM) analysis of the system. Their practical handling can be realized using a penalty function approach, where the primary objective (antenna size reduction) is complemented by contributions proportional to properly quantified constraint violations. The coefficients determining the contribution of the penalty terms are normally set up using designer's experience, which is unlikely to render their optimum values in terms of the achievable miniaturization rates as well as constraint satisfaction. This letter proposes a procedure for automated penalty factor adjustment in the course of the optimization process. Our methodology seeks for the most suitable coefficient levels based on the detected constraint violations and feasibility status of the design. It is validated using two CP antenna structures. The results demonstrate a possibility of a precise constraint control as well as superior miniaturization rates as compared to the manual penalty term setup.

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Compact Circularly Polarized Wide-Beamwidth Fern-Fractal-Shaped Microstrip Antenna for Vehicular Communication

Cited by 54 publications

References 20 publications

Optimization of inscribed hexagonal fractal slotted microstrip antenna using modified lightning attachment procedure optimization

Optimization of inscribed hexagonal fractal slotted microstrip antenna using modified lightning attachment procedure optimization

Novel coated differentially fed dual‐band fractal antenna for implantable medical devices

Explicit Size-Reduction of Circularly Polarized Antennas Through Constrained Optimization With Penalty Factor Adjustment

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