東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

The finite-difference time-domain me...

Lazzi, Gianluca.

Linked to FindBook

Google Book

Amazon

博客來

The finite-difference time-domain method as applied to the dosimetry of mobile telephones.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The finite-difference time-domain method as applied to the dosimetry of mobile telephones./
Author:	Lazzi, Gianluca.
Description:	148 p.
Notes:	Source: Dissertation Abstracts International, Volume: 59-04, Section: B, page: 1785.
Contained By:	Dissertation Abstracts International59-04B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9829754
ISBN:	0591824736

The finite-difference time-domain method as applied to the dosimetry of mobile telephones.
Lazzi, Gianluca.

The finite-difference time-domain method as applied to the dosimetry of mobile telephones. - 148 p.

Source: Dissertation Abstracts International, Volume: 59-04, Section: B, page: 1785.

Thesis (Ph.D.)--The University of Utah, 1998.

Cellular telephones have been introduced into society at a very rapid rate. This has resulted in public concern about the possible health hazards associated with the use of these devices. Several safety guidelines, therefore, have been proposed for compliance testing of induced electromagnetic fields in the human body in terms, usually, of specific absorption rates of power or SARs. In this dissertation we have used the Finite-Difference Time-Domain (FDTD) method for the analysis of the interaction of hand-held devices and the human head and for compliance testing of cellular telephones. Effects of the variation of the dielectric properties of human tissues and human head size on the SAR distribution have been considered. To simulate realistic positions of a person holding a cellular telephone, a new technique to rotate the model of the human head derived from Magnetic Resonance Imaging (MRI) scans with six degrees of freedom has been developed. This has allowed us to consider the two realistic postures of the head vis a vis the handset which is kept vertical to avoid the staircase approximation in its modeling. The two postures of the head are: tilted forward by 30 degrees, and tilted forward by 30 degrees with a further rotation of 9 degrees toward the mouthpiece of the telephone. In order to reduce the the large amount of computer memory required for these simulations, we have developed a new truncation technique that results in savings of more than 50% of computer memory with less than 1% error for most of the cases.

ISBN: 0591824736Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

The finite-difference time-domain method as applied to the dosimetry of mobile telephones.
LDR:03313nmm 2200325 4500 001 1849476
005 20051203075652.5
008 130614s1998 eng d
020 $a 0591824736
035 $a (UnM)AAI9829754
035 $a AAI9829754
040 $a UnM $c UnM
100 1 $a Lazzi, Gianluca. $3 1937432
245 1 4 $a The finite-difference time-domain method as applied to the dosimetry of mobile telephones.
300 $a 148 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-04, Section: B, page: 1785.
500 $a Adviser: Om P. Gandhi.
502 $a Thesis (Ph.D.)--The University of Utah, 1998.
520 $a Cellular telephones have been introduced into society at a very rapid rate. This has resulted in public concern about the possible health hazards associated with the use of these devices. Several safety guidelines, therefore, have been proposed for compliance testing of induced electromagnetic fields in the human body in terms, usually, of specific absorption rates of power or SARs. In this dissertation we have used the Finite-Difference Time-Domain (FDTD) method for the analysis of the interaction of hand-held devices and the human head and for compliance testing of cellular telephones. Effects of the variation of the dielectric properties of human tissues and human head size on the SAR distribution have been considered. To simulate realistic positions of a person holding a cellular telephone, a new technique to rotate the model of the human head derived from Magnetic Resonance Imaging (MRI) scans with six degrees of freedom has been developed. This has allowed us to consider the two realistic postures of the head vis a vis the handset which is kept vertical to avoid the staircase approximation in its modeling. The two postures of the head are: tilted forward by 30 degrees, and tilted forward by 30 degrees with a further rotation of 9 degrees toward the mouthpiece of the telephone. In order to reduce the the large amount of computer memory required for these simulations, we have developed a new truncation technique that results in savings of more than 50% of computer memory with less than 1% error for most of the cases.
520 $a An accurate modeling of several antennas commonly used for mobile telephones has also been considered. A new technique to model helical antennas and helix-monopole antennas has been developed and tested against near- and far-field measurements of EM fields.
520 $a The influence of the new Perfectly Matched Layer (PML) boundary condition on these simulations has been considered. A new approach to optimize the performance of the PML boundary condition has also been developed and used.
520 $a Accuracy of the results has been validated by comparing SARs, radiation patterns, and near field computations with measurements performed at the University of Utah or provided by the manufacturer. Lastly, new directions of research toward the development of low SAR, high radiation efficiency, patch antennas are suggested.
590 $a School code: 0240.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Health Sciences, Occupational Health and Safety. $3 1017799
650 4 $a Biophysics, Medical. $3 1017681
690 $a 0544
690 $a 0354
690 $a 0760
710 2 0 $a The University of Utah. $3 1017410
773 0 $t Dissertation Abstracts International $g 59-04B.
790 1 0 $a Gandhi, Om P., $e advisor
790 $a 0240
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9829754