Miniaturized Antenna with Combination of Meander and Square Spiral Slots for Biomedical Applications

The objective of this study is to investigate the impact of human exposure due to electromagnetic fields and to reduce the specific absorption rate (SAR). This work focuses on the implementation of different electromagnetic shield materials such as conductive materials, dielectric materials, ferrite materials, and metamaterials that are currently used for SAR reduction. The experimental analysis is performed with the global system for mobile communication (GSM) dipole antenna operating at 900 MHz as its radiation source. The designed dipole is placed in front of a cube with similar dielectric properties of human tissue. The computation, implementation, and evaluation are performed by using the method of moments. Further calculation of SAR reduction factor (SRF), SAR 1 g, gain, directivity, and beamwidth are estimated for 15 different shield materials. There is a need for an ideal shield material that could reduce SAR and does not compromise the performance of the radiation structure. This work investigates and proposes the nanomaterials and composites as suitable shield materials for SAR reduction. This novel approach of implementation of nanomaterials has proved to increase the SRF over 90% than conventional reduction materials. In addition, gain and directivity are also increased by 50% than the existing shield materials. The currently used materials are compared with the proposed nanomaterials, and the results are analyzed. The results indicate that the nanomaterials and its composites are ideal shield material for SAR reduction.

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“…Classification of SAR reduction methods . AMC, artificial magnetic conductor; SAR, specific absorption rate…”

Section: Review Of Literaturementioning

confidence: 99%

“…In recent studies, the experiments on substrate materials are investigated. The polyamide substrate with an additional metamaterial structure is studied by experimenting on the human forearm, and results indicated that SAR could be reduced . The distance of the antenna placed is pivotal in influencing factors of SAR reduction.…”

Section: Review Of Literaturementioning

confidence: 99%

An investigation on specific absorption rate reduction materials with human tissue cube for biomedical applications

Stephen

Hemanth

2019

Int J RF Microw Comput Aided Eng

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“…Meander systems are widely used in the applications of wireless communication systems and antennas [1]- [3], biomedical field [4], [5], filter production [6]- [8], couplers and in-phase inverters [9], [10], slow-wave systems (SSs) [11]- [15], and traveling waves tubes [16]- [18].…”

Section: Introductionmentioning

confidence: 99%

Influence Coefficients of Constructive Parameters of Meander Slow-Wave System with Additional Shields

Metlevskis

Martavičius

Katkevičius

et al. 2016

Electrical, Control and Communication Engineering

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-Constructions of meander slow-wave systems with additional shields grounded at different positions are presented. The construction of meander slow-wave systems with additional shields grounded at both edges is investigated in detail. The influence of the main constructive parameters on the electrical characteristics of meander slow-wave systems with additional shields grounded at both edges is evaluated. The main constructive parameters of the investigated system are: the length of the conductor, the width of meander conductor, the width of additional shield, and the width of the gap between adjacent meander conductors.Sonnet® software package, which is based on the method of moments, has been used during the investigation. The results of the influence of constructive parameters to the phase delay time, input impedance, and the width of pass-band of the system are discussed.

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Miniaturization and performance studies of Rectangular Microstrip Patch Antennae using Minkowski fractal for Ku band communications by inset feed technique

Froumsia

Dikoundou

İnç

et al. 2022

Preprint

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In this paper we have proposed an improved miniaturization design of a rectangular microstrip patch antenna based on Minkowski fractal. The design methodology consists in considering a rectangular patch on which the conventional and modified Minkowski curve are successively applied until the second iteration. In total, three miniaturized antennae are proposed. They are structured by a fractal patch engraved on an FR-4 epoxy substrate. Design and simulation are performed by CADFEKO 7.0.1 software, better suited for small size antennae. The proposed miniaturized fractal models operate at the same frequency F= 15.53 GHz, as the conventional Rectangular Microstrip patch antenna. Moreover, each of them enables a good impedance matching, as can be confirmed by the low return loss obtained (< -15 dB) at the same resonance frequency. The proposed antennae presented a significant size reduction of 89.76 % for Minkowski model, 88.8 % and 86% for both modified Minkowskimodels when compared to the conventional inset-fed rectangular patch antenna. Overall, our study illustrated that, after a modified Minkowski miniaturization technique was introduced a better performance and impedance matching was achieved. According to the IEEE Standard Classification of Satellite Frequency Bands, the results of the miniaturized and optimized fractal patch antenna can effectively contribute to Ku-band communications.

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Miniaturized Antenna with Combination of Meander and Square Spiral Slots for Biomedical Applications

Cited by 3 publications

References 20 publications

An investigation on specific absorption rate reduction materials with human tissue cube for biomedical applications

An investigation on specific absorption rate reduction materials with human tissue cube for biomedical applications

Influence Coefficients of Constructive Parameters of Meander Slow-Wave System with Additional Shields

Miniaturization and performance studies of Rectangular Microstrip Patch Antennae using Minkowski fractal for Ku band communications by inset feed technique

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