scholarly journals Design and Specific Absorption Rate of 2.6 GHz Rectangular-Shaped Planar Inverted-F Antenna

2018 ◽  
Vol 10 (2) ◽  
pp. 741
Author(s):  
Nurul Inshirah Mohd Razali ◽  
Norhudah Seman ◽  
Nur Ilham Aliyaa Ishak
Keyword(s):  
Reflection Coefficient ◽  
Parametric Study ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Ground Plane ◽  
Excitation Power ◽  
Antenna Gain ◽  
Specific Absorption ◽  
Patch Length ◽  
Cst Microwave Studio

<span lang="EN-US">This article presents the investigation of specific absorption rate (SAR) of a rectangular-shaped planar inverted-F antenna (PIFA) at frequency of 2.6 GHz. Initially, the design antenna is presented with parametric study concerning the dimensions of antenna patch length, shorting plate, ground plane and substrate. The proposed PIFA antenna has -20.46 dB reflection coefficient and 2.383 dB gain. The PIFA’s SAR is correlated with the antenna gain and excitation power. The analysis shows that higher gain contributes to a lower SAR value. While, the higher excitation power causes a higher SAR value. All the design and analysis are performed using the CST Microwave Studio</span>

scholarly journals Improved Handset Antenna Performance via an Electrically Extended Ground Plane

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Shirook M. Ali ◽  
Huanhuan Gu ◽  
Kelce Wilson ◽  
James Warden
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Near Field ◽  
Ground Plane ◽  
Practical Approach ◽  
Far Field ◽  
Specific Absorption ◽  
Antenna Performance ◽  
Field Patterns ◽  
Surface Metal

A novel and practical approach is presented providing improved antenna performance without enlarging the antenna or the ground plane. The approach electrically extends the ground plane using wire(s) that behave as surface metal extensions of the ground plane. The wire extensions can be accommodated within typical handset housing or as part of the stylish metal used on the handset’s exterior perimeter; hence don’t require enlargement of the device. Consequently, this approach avoids the costs and limitations traditionally associated with physically lengthening of a ground plane. Eight variations are presented and compared with baseline antenna performance. Both far-field patterns and near-field electromagnetic scans demonstrate that the proposed approach controls the electrical length of the ground plane and hence its chassis wavemodes, without negatively impacting the characteristics of the antenna. Improvements in performance of up to 56% in bandwidth at 900 MHz and up to 12% in efficiency with a reduction of up to 12% in the specific absorption rate (SAR) are achieved. An 8% increase in efficiency with a 1.3% improvement in bandwidth and a 20% reduction in SAR is achieved at 1880 MHz. Thus, improvements in bandwidth are achieved without compromising efficiency. Further, improvements at lower frequencies do not compromise performance at higher frequencies.

scholarly journals SAR Evaluation of Metallic Loop-like Accessory Effect of Broadband Wearable Planar Monopole Textile Antenna

2018 ◽  
Vol 7 (3) ◽  
pp. 17-22
Author(s):  
H. H. Zainal ◽  
H. A. Rahim ◽  
P. J. Soh ◽  
H. Lago ◽  
K. N. A. Rani ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Monopole Antenna ◽  
Specific Absorption ◽  
Textile Antenna ◽  
The Common ◽  
Cst Microwave Studio

This paper presents the investigation influence of the common metallic loop like accessory on Specific Absorption Rate (SAR) averaged over 10g and 1 g tissue.The simulations were made by means CST Microwave Studio software at frequencies 2.45GHz and 2.6GHz. Numerical analysis conducted using broadband textile monopole antenna (TM) with variations of orientation and distance showed that the SAR value increased when the antenna horizontally polarized.This is up to 80% more than vertically polarized TM placed closest item to 2mm.

scholarly journals Miniaturized implantable power transmission system for biomedical wireless applications

2020 ◽  
Vol 7 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Shuoliang Ding ◽  
Stavros Koulouridis ◽  
Lionel Pichon
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Power Transmission ◽  
Antenna Design ◽  
Wireless Power ◽  
Specific Absorption ◽  
Wireless Applications ◽  
Power Needs

AbstractIn this paper, a complete wireless power transmission scenario is presented, including an external transmission antenna, an in-body embedded antenna, a rectifying circuit, and a powered sensor. This system operates at the Industrial, Scientific, and Medical bands (902.8–928 MHz). For the antenna design, important parameters including reflection coefficient, radiation pattern, and specific absorption rate are presented. As for the rectifying circuit, a precise model is created utilizing off-the-shelf components. Several circuit models and components are examined in order to obtain optimum results. Finally, this work is evaluated against various sensors' power needs found in literature.

scholarly journals Novel Multiband Metal-Rimmed Antenna for Wearable Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Bin Liu ◽  
Jianghong Han ◽  
Songhua Hu ◽  
Li Zhang
Keyword(s):  
Numerical Simulations ◽  
Human Body ◽  
Free Space ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Ground Plane ◽  
Large Area ◽  
Specific Absorption ◽  
Additional Resonance ◽  
Feeding Structure

A novel multiband antenna with an unbroken metal rim for wearable applications is presented. In order to achieve a wideband behavior, minimizing at the same time the size of the clearance area on the antenna ground plane, a novel feeding structure is proposed. This is achieved by connecting the metal rim to the ground plane thus allowing generating one lower-frequency resonance without occupying a large area. An additional resonance is then obtained using a suitable shorting patch. In this way, the proposed antenna presents a broadband behavior, while the width of the clearance area on the ground plane is of only 2 mm. The antenna performances in free-space and on a human phantom simulating a human body are analyzed by means of numerical simulations. Finally, the specific absorption rate (SAR) is analyzed to establish the antenna reliability in wearable applications. The experimental results demonstrate superior and stable performances of the metal-rimmed antenna when it is employed in wearable applications.

scholarly journals Design and Analysis of Textile Antenna using EBG Structure

2019 ◽  
Vol 8 (9) ◽  
pp. 2137-2142
Keyword(s):  
Reflection Coefficient ◽  
Band Gap ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Substrate Material ◽  
Impedance Bandwidth ◽  
Electromagnetic Band Gap ◽  
Specific Absorption ◽  
Phantom Model ◽  
Textile Antenna

In this article, the rectangular textile antenna is embedded with E-shape Electromagnetic Band Gap (EBG) Structure for reduction of SAR. It is positioned on human phantom model. The E-shape EBG array is positioned between ground and patch of rectangular textile antenna. It is resonant at 2. 4GHz.The substrate material for the rectangular Textile antenna is jeans cloth. The Specific Absorption Rate (SAR), Reflection coefficient and Impedance Bandwidth are obtained with and without EBG structure using HFSS software and also measured.

scholarly journals Designs of rectangular-shaped planar Inverted-F antennas at mobile operating frequencies with different ground plane techniques

2019 ◽  
Vol 15 (2) ◽  
pp. 927
Author(s):  
Nurul Inshirah Mohd Razali ◽  
Norhudah Seman ◽  
Tien Han Chua
Keyword(s):  
Reflection Coefficient ◽  
Resonant Frequency ◽  
Ground Plane ◽  
Radiation Patterns ◽  
Frequency Range ◽  
Radiating Element ◽  
Parametric Studies ◽  
Lower Frequency Range ◽  
Patch Length ◽  
Cst Microwave Studio

This article presents the designs of planar inverted-F antennas (PIFAs) at frequencies of 0.835 GHz, 0.9 GHz, 1.8 GHz, 1.9 GHz, 2 GHz, and 2.6 GHz. Initially, the designs of rectangular-shaped PIFAs are determined through the parametric studies concerning the dimensions of the antenna’s patch length, shorting plate, ground plane, and substrate. Afterward, rectangular-shaped slots are introduced into radiating element of two antennas that operate at a lower frequency range of less than 1 GHz, to tune the resonant frequency to the respective 0.835 GHz and 0.9 GHz. Different configurations of partial or full ground plane are implemented to improve the reflection coefficient, <em>S</em><sub>11</sub> performance to be below -10 dB in both simulation and measurement. The proposed six PIFAs have gain that are greater than 2 dB with the nearly omnidirectional radiation patterns. All the designs and analyses are performed using the CST Microwave Studio utilizing Rogers 4003C substrate.

Variability of Specific Absorption Rate of Human Body for Various Configurations of Tablet Computer in Vicinity of Abdomen

2015 ◽  
Vol E98.B (7) ◽  
pp. 1173-1181 ◽  
Author(s):  
Akihiro TATENO ◽  
Tomoaki NAGAOKA ◽  
Kazuyuki SAITO ◽  
Soichi WATANABE ◽  
Masaharu TAKAHASHI ◽  
...  
Keyword(s):  
Human Body ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Tablet Computer ◽  
Specific Absorption
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