Hybrid Computational Scheme for Antenna-Human Body Interaction

Ramli, Khairun Nidzam; Abd‐Alhameed, Raed A.; See, Chan Hwang; Excell, Peter S.; Noras, James M.

doi:10.2528/pier12082209

Cited by 7 publications

(6 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a known drawback of the FDTD method [13]. To overcome this drawback, subgridding techniques have been introduced in the literature [24][25][26][27][28][29][30][31][32][33]. In such techniques, part of the FDTD grid is replaced with a finer grid, which is called the subgrid [13].…”

Section: Two Dimensionsmentioning

confidence: 99%

On the application of the spectral element method in electromagnetic problems involving domain decomposition

Mahariq¹

2017

Turk J Elec Eng & Comp Sci

View full text Add to dashboard Cite

Abstract:One of the challenges in electromagnetics is to solve electromagnetic fields originated from a radiating source or a scattering object in distances that largely exceed the dimensions of the source or scatterer. In this paper, domain decomposition based on the application reasoning of the perfectly matched layer (PML) is studied by the spectral element method (SEM) for the first time in order to solve near and far electromagnetic fields without requiring substantially computational resources. Scattering from a loss-free dielectric cylinder and radiated fields from a line source are the problems utilized for the purpose of numerical demonstration in two dimensions in order to verify the successful application of SEM and its accuracy under domain decomposition. It is demonstrated that it is possible to accurately solve for near-field and far-field zones where millions of unknowns are encountered by using a typical personal computer.

show abstract

Section: Two Dimensionsmentioning

confidence: 99%

On the application of the spectral element method in electromagnetic problems involving domain decomposition

Mahariq¹

2017

Turk J Elec Eng & Comp Sci

View full text Add to dashboard Cite

show abstract

“…From the published literature [1][2][3][4][5][6][7], it may be observed that many of the works have treated RF and tissue interaction mechanism effects as a linear problem. Relatively few papers [8][9][10][11][12][13] have moved towards searching for proof of the existence of nonlinear biological tissue responses, including molecular processes and microscopic studies at cellular level.…”

Section: Introductionmentioning

confidence: 99%

“…This has led to different defined levels of analysis, i.e. human level, tissue level, cell level and ionic level [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Calibration model for detection of potential demodulating behaviour in biological media exposed to RF energy

See

Abd‐Alhameed

Ghani

et al. 2017

IET Science, Measurement & Technology

Self Cite

View full text Add to dashboard Cite

Abstract-Potential demodulating ability in biological tissue exposed to Radio Frequency (RF) signals intrinsically requires an unsymmetrical diode-like nonlinear response in tissue samples. This may be investigated by observing possible generation of the second harmonic in a cavity resonator designed to have fundamental and second harmonic resonant frequencies with collocated antinodes. Such a response would be of interest as being a mechanism that could enable demodulation of information-carrying waveforms having modulating frequencies in ranges that could interfere with cellular processes. Previous work has developed an experimental system to test for such responses: the present work reports an electric circuit model devised to facilitate calibration of any putative nonlinear RF energy conversion occurring within a nonlinear test-piece inside the cavity. The method is validated computationally and experimentally using a well-characterised nonlinear device. The variations of the reflection coefficients of the fundamental and second harmonic responses of the cavity due to adding nonlinear and lossy material are also discussed. The proposed model demonstrates that the sensitivity of the measurement equipment plays a vital role in deciding the required input power to detect any second harmonic signal, which is expected to be very weak. The model developed here enables the establishment of a lookup table giving the level of the second harmonic signal in the detector as a function of the specific input power applied in a measurement. Experimental results are in good agreement with the simulated results.

show abstract

“…The mismatch problem can be solved by tuning the operating frequency of the antenna, but the drop in the radiation efficiency is always a difficult problem for antenna engineers to solve. The influence of the user's head and hand on the antenna's efficiency has been studied in [3][4][5][6][7][8][9][10][11]. However, in practice, the user can use either the left or right hand to hold the mobile handset in the talking mode.…”

Section: Introductionmentioning

confidence: 99%

Reduce the Hand-Effect Body Loss for Lte Mobile Antenna in Ctia Talking and Data Modes

Zhao¹,

Zhang²,

Ying³

et al. 2013

PIER

View full text Add to dashboard Cite

Abstract-The reduction in the radiation efficiency of an antenna in a mobile handset due to user's hand effects in the talking and data modes is studied. A parameter called "body loss" is defined to evaluate the degradation of the radiation efficiency. A C-fed on-ground (OG) PIFA antenna, which can cover two typical LTE bands of 0.75 GHz-0.96 GHz and 1.7 GHz-2.1 GHz, is used to study the property of the hand-effect body loss in two CITA test positions: the talking and data modes. Three different positions of the proposed antenna in the talking mode are compared, and the position with the antenna located on the bottom of the mobile handset and facing the head is recommended for minimal body loss. A modified design with a smaller antenna width is proposed to reduce further the hand-effect body loss in the talking and data modes.

show abstract

Hybrid Computational Scheme for Antenna-Human Body Interaction

Cited by 7 publications

References 28 publications

On the application of the spectral element method in electromagnetic problems involving domain decomposition

On the application of the spectral element method in electromagnetic problems involving domain decomposition

Calibration model for detection of potential demodulating behaviour in biological media exposed to RF energy

Reduce the Hand-Effect Body Loss for Lte Mobile Antenna in Ctia Talking and Data Modes

Contact Info

Product

Resources

About