Specific absorption rate
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The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted full papers will be peer reviewed. Accepted high quality papers will be presented in oral and poster sessions,will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE.
2021 IEEE Photovoltaic Specialists Conference (PVSC)
Photovoltaic materials, devices, systems and related science and technology
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.
The world's premiere conference in MEMS sensors, actuators and integrated micro and nano systems welcomes you to attend this four-day event showcasing major technological, scientific and commercial breakthroughs in mechanical, optical, chemical and biological devices and systems using micro and nanotechnology.The major areas of activity in the development of Transducers solicited and expected at this conference include but are not limited to: Bio, Medical, Chemical, and Micro Total Analysis Systems Fabrication and Packaging Mechanical and Physical Sensors Materials and Characterization Design, Simulation and Theory Actuators Optical MEMS RF MEMS Nanotechnology Energy and Power
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.
The Transactions on Biomedical Circuits and Systems addresses areas at the crossroads of Circuits and Systems and Life Sciences. The main emphasis is on microelectronic issues in a wide range of applications found in life sciences, physical sciences and engineering. The primary goal of the journal is to bridge the unique scientific and technical activities of the Circuits and Systems ...
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
EMC standards; measurement technology; undesired sources; cable/grounding; filters/shielding; equipment EMC; systems EMC; antennas and propagation; spectrum utilization; electromagnetic pulses; lightning; radiation hazards; and Walsh functions
MILCOM 2007 - IEEE Military Communications Conference, 2007
Current military radio antennas for man-portable radios suffer from bandwidth, pattern, overall gain limitation and covertness. A number of helmet antenna designs will be analyzed and demonstrated in the bands of interest of 750-870 MHz, and 1350-2700 MHz. The helmet antenna solutions use conductive ink printing techniques to realize antenna elements that are conformal to the helmet's shape. The solutions ...
2015 Radio and Antenna Days of the Indian Ocean (RADIO), 2015
International measurement standards have been elaborated to assess the specific absorption rate (SAR) compliance of mobile phones. The procedure to evaluate SAR pre-compliance of mobile phones using numerical modeling tools based on the finite difference time domain (FDTD) method is currently being developed by the international standardization committee of IEC/IEEE 62704-3. The uncertainty quantification of the SAR calculation using a ...
2015 27th International Conference on Microelectronics (ICM), 2015
In this paper, the main motivation is to introduce a new behavior of the electromagnetic band gap (EBG) structures, it is a significant shifting the resonance frequency down of the dipole antennas, this very interesting and useful technique led to low profile, in addition to performance enhancement of dipole antennas, either on return loss or radiation pattern. Also among this ...
2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006
This paper reports on the specific absorption rate (SAR) and the current density analysis of biological tissue surrounding an air-core type of transcutaneous transformer for an artificial heart. The electromagnetic field in the biological tissue surrounding the transformer was analyzed by the transmission-line modeling method, and the SAR and current density as a function of frequency (200k-1 MHz) for a ...
IEEE Antennas and Propagation Society International Symposium. 1996 Digest, 1996
Most countries have established the standards, based on the use of SAR (specific absorption rate) that regulate the electromagnetic emission and exposure of electronic systems. By and large, the acceptable limit of SAR for an incident plane wave is 0.08 Wlkg, averaged over the entire body. However, the question of acceptable safe level for an antenna close to the tissues, ...
IMS MicroApps: Multi-Rate Harmonic Balance Analysis
28 GHz mmWave Channel Sounder: From Inception to Reality - Arun Ghosh: Brooklyn 5G Summit 2017
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An Ultra-Wideband Low-Power ADPLL Chirp Synthesizer with Adaptive Loop Bandwidth in 65nm CMOS: RFIC Interactive Forum
2012 IEEE Honors Ceremony
Conformity Assessment: A Process - Rudi Schubert, IEEE Standards Association
Skillful Manipulation Based on High-Speed Sensory-Motor Fusion
A Fully Integrated 75-83GHz FMCW Synthesizer for Automotive Radar Applications with -97dBc/Hz Phase Noise at 1MHz Offset and 100GHz/mSec Maximal Chirp Rate: RFIC Industry Showcase 2017
Double Barrier Memristive Devices for Neuromorphic Computing - Martin Zeigler: 2016 International Conference on Rebooting Computing
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2011 IEEE Richard W. Hamming Medal - Toby Berger
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Massive MIMO at 60 GHz vs. 2 GHz - Eric Larsson: Brooklyn 5G Summit 2017
Current military radio antennas for man-portable radios suffer from bandwidth, pattern, overall gain limitation and covertness. A number of helmet antenna designs will be analyzed and demonstrated in the bands of interest of 750-870 MHz, and 1350-2700 MHz. The helmet antenna solutions use conductive ink printing techniques to realize antenna elements that are conformal to the helmet's shape. The solutions are highly integrated into the helmet and other equipment on the soldier head for a helmet antenna system with negligible or no equipment weight gain. The design of the antenna system will take into account of the electromagnetic coupling of the head, torso and other soldier equipment on the performance of the antenna system. A Specific Absorption Rate (SAR) study will ensure safety or the user.
International measurement standards have been elaborated to assess the specific absorption rate (SAR) compliance of mobile phones. The procedure to evaluate SAR pre-compliance of mobile phones using numerical modeling tools based on the finite difference time domain (FDTD) method is currently being developed by the international standardization committee of IEC/IEEE 62704-3. The uncertainty quantification of the SAR calculation using a computer-aided design (CAD) mobile phone model is a challenging task, yet to be fully addressed. Herein a procedure to quantify the model or structural uncertainty is proposed. It is based on the calibration of the CAD mobile phone model by experimental SAR data obtained using a flat phantom filled with the appropriate tissue equivalent liquid. The procedure is applied to two commercially available mobile phone models.
In this paper, the main motivation is to introduce a new behavior of the electromagnetic band gap (EBG) structures, it is a significant shifting the resonance frequency down of the dipole antennas, this very interesting and useful technique led to low profile, in addition to performance enhancement of dipole antennas, either on return loss or radiation pattern. Also among this EBG structure an investigation on specific absorption rate (SAR) is shown. The used dipole antenna is resonating around 3.5GHz (part of 4G bands), then by using this technique we could shift the working frequency of the same dipole antenna to 2.8GHz worldwide interoperability for microwave access (WiMAX), this new resonance is 80% lower compared with the normal resonance without any structure. The principle of this new technique still valid with other frequency, depending on the frequencies that we would like to shift the working frequency between.
This paper reports on the specific absorption rate (SAR) and the current density analysis of biological tissue surrounding an air-core type of transcutaneous transformer for an artificial heart. The electromagnetic field in the biological tissue surrounding the transformer was analyzed by the transmission-line modeling method, and the SAR and current density as a function of frequency (200k-1 MHz) for a transcutaneous transmission of 20 W were calculated. The model's biological tissue has three layers including the skin, fat and muscle. As a result, the SAR in the vicinity of the transformer is sufficiently small and the normalized SAR value, which is divided by the ICNIRP's basic restriction, is 7times10<sup>-3</sup> or less. On the contrary, the current density is slightly in excess of the ICNIRP's basic restrictions as the frequency falls and the output voltage rises. Normalized current density is from 0.2 to 1.2. In addition, the layer in which the current's density is maximized depends on the frequency, the muscle in the low frequency (<700kHz) and the skin in the high frequency (>700kHz). The result shows that precision analysis taking into account the biological properties is very important for developing the transcutaneous transformer for TAH
Most countries have established the standards, based on the use of SAR (specific absorption rate) that regulate the electromagnetic emission and exposure of electronic systems. By and large, the acceptable limit of SAR for an incident plane wave is 0.08 Wlkg, averaged over the entire body. However, the question of acceptable safe level for an antenna close to the tissues, e.g., for a hand-held mobile phone, still remains open, since the standards based on the "far field" definition are no longer acceptable. Currently, many standardization groups are actively researching into this question, and they have proposed several levels of "acceptable" doses. For instance, the acceptable maximum is 2 W/kg, averaged over 10 grams and a period of 6 minutes dictated by CENELEC (ENV 50166-2), which is likely to be transformed into an European directive for compliance in the future. It is obvious, however, that extensive studies must be performed to reliably estimate the field and the SAR in the tissues before this standard could be enforced. Towards this end, France Telecom, in collaboration with the EMC laboratory of the University of Illinois, has embarked upon a project to evaluate the power deposited in the human head from a generic transceiver operating at 900 MHz. The paper presents some results based upon this study.
In this communication, the V-MoM formulation is briefly described, together with a strategy to reduce the computational cost using the Adaptive Cross Approximation algorithm (ACA)  and an iterative solver based on the Conjugate Gradient (CG), CGACA. Finally, a practical application is presented where the field distribution inside a human body model is calculated.
In this paper, specific absorption rate (SAR) reduction at the PIFA type for a mobile phone using various types of EBG structure are tested. Two EBG structures, that is a via or a via-less, are designed. The EBG structures can reduce the surface wave and prevent the undesired radiation from the ground plane. Thus, the EBG structure which is designed for mobile terminal enables to comply with the exposure guideline. From the simulation and measured results demonstrated the reduction of the radiation pattern towards the direction of human head and the SAR value.
In this paper, a novel use of an asymmetrically fed insulated coaxial slot antenna (ICSA) type of applicator for interstitial microwave hyperthermia that simultaneously exhibits good impedance matching and enhanced tip-heating performances is presented. Theoretical analysis reveals that by making the distal arm much shorter than the other arm of the antenna, charge densities distributed over the distal arm of the antenna increase significantly. This, in turn, can result in the radial electric-field component becoming the dominant contributor to the specific absorption rate (SAR) over the distal arm side of the heating region and, therefore, the achievement of enhanced tip- heating performance. With the length of the longer arm chosen to be slightly longer than a quarter-wavelength, good impedance matching and enhanced tip- heating performances are achieved when the length of the shorter distal arm is reduced to no more than 25% of that of the longer arm. Good agreements observed between theoretical and measured SAR patterns for two ICSA's designed for operation at 915 and 433 MHz, respectively, confirm the validity of the design method.
Temperature rises in the human head for portable telephones were computed with an anatomically based head model at 900 MHz and 1.5 GHz. The specific absorption rate (SAR) in the human head was determined using the finite- difference time-domain (FDTD) method, while a bioheat equation was numerically solved also using the FDTD method. The portable telephone was modeled by a quarter-wavelength monopole antenna on a dielectric covered metal box. The source geometries considered were the telephone barely touching the ear and the telephone pressing the ear, both having a vertical alignment at the side of the head. The antenna output power was set to be consistent with the portable telephones of today: 0.6 W at 900 MHz and 0.27 W at 1.5 GHz. Computed results show that a phone time of 6-7 min yields a temperature rise of approximately 90% of the steady-state value. Application of the ANSZ/IEEE safety guidelines restricting the 1-g-averaged spatial peak SAR to 1.6 W/kg results in the maximum temperature rise in the brain of 0.06/spl deg/C, and application of the ICNIRP/Japan safety guidelines restricting the 10-g-averaged spatial peak SAR to 2 W/kg results in the maximum temperature rise in the brain of 0.11/spl deg/C, both at 900 MHz and 1.5 GHz.
The rate of heating of 15 nm uniformly-sized magnetic aqueous nanoparticles suspension by high-amplitude and high-frequency ac magnetic field induced by the resonating LC circuit was measured. The results are analyzed in terms of specific energy absorption rate (SAR). Fitting field amplitude and frequency dependences of SAR to the linear response theory, magnetic moment per particles was extracted. The value of magnetic moment was independently evaluated from dc magnetization measurements of a frozen colloid by fitting field-dependent magnetization to a Langevin function. The two methods produced similar results, which are compared to the theoretical expectation for this particle size. Additionally, analysis of SAR curves yielded effective relaxation time.
To specify protocols for the measurement of the peak spatial-average specific absorption rate (SAR) in a simplified model of the head of users of hand-held radio transceivers used for personal wireless communications services and intended to be operated while held next to the ear. It applies to contemporary and future devices with the same or similar operational characteristics as contemporary ...
IEEE Recommended Practice for Determining the Peak Spatial-Average Specific Absorption Rate (SAR) in the Human Head from Wireless Communications Devices: Measurement Techniques - Amendment 1: CAD File for Human Head Model (SAM Phantom)
The scope of IEEE Std 1528 is to specify protocols for the measurement of the peak spatial-average SAR in a simplified model of the head of users of handheld radio transceivers used for personal wireless communications services and intended to be operated while held next to the ear. This amendment addresses ambiguity in the language of certain sections and provides ...
Revise and develop specifications for preferred methods for measuring and computing external radiofrequency electromagnetic fields to which persons may be exposed. In addition, the document will specify preferred methods for the measurement and computation of the resulting fields and currents that are induced in bodies of humans exposed to these fields over the frequency range of 100 kHz to 300 ...
Develop safety levels for human exposure to electromagnetic fields from 0 to 3kHz. This standard will be based on the results of an evaluation of the relevant scientific literature and proven effects which are well established and for which thresholds of reaction are understood. Field limits will be derived from threshold current densities or internal electric fields.
Recommendations are made to protect against established adverse health effects in human beings associated with exposure to electric, magnetic and electromagnetic fields in the frequency range of 3 kHz to 300 GHz. The recommendations are expressed in terms of basic restrictions (BRs) and maximum permissible exposure (MPE) values. The BRs are limits on internal fields, specific absorption rate (SAR), and ...