Search results for: Antonio Šarolić
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IEEE Transactions on Electromagnetic Compatibility > 2017 > 59 > 3 > 813 - 822
In this study, we provide a novel approach for exposure assessment in terms of whole-body average specific absorption rate (WBSAR) due to the electromagnetic fields inside reverberant environments. The approach utilizes power balance theory and the lossy object's absorption cross section ( ACS). We use this to present a noninvasive technique for determining the WBSAR in reflective environments. Measurements...
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IEEE Transactions on Electromagnetic Compatibility > 2016 > 58 > 3 > 721 - 728
We provide the results of human body absorption cross-section (ACS) measurements. The setup was based on the reverberation chamber as a well-known measurement environment capable of performing ACS measurements. The approach was supported by reference measurements on canonically shaped objects which were convenient for analytical (Mie scattering theory) ACS calculations. Measured ACS of canonical objects...
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This study presents an experimental approach to the analysis of absorption characteristics of a lossy dielectric object in a reverberant environment. The study used a canonically shaped water-filled sphere, convenient for Absorption cross-section ACS calculations (analytical or by simulations), and measured the internal temperature rise when exposed to RF radiation. All measurements were conducted...
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This study gives experimental results for a rectangular microstrip patch antenna, regarding its parameters and their dependence on the substrate loss tangent. Antenna was modeled to exhibit circular polarization at two frequencies of interest: 826 MHz (a frequency in the digital dividend spectrum, mainly reserved in Europe for LTE networks) and 900 MHz (a frequency in the GSM uplink band). Experimental...
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ICECom 2013 > 1 - 4
A comparison in determining the shielding effectiveness of resonant conductive enclosures, having apertures in a removable side wall, using mode-tuned and mode-stirred methods is introduced. The measurement setup was based on GTEM cell as a compact field-generating environment, capable of accommodating small enclosures as DUTs. The signal was fed into the GTEM cell, thus creating a controlled incident...
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The pregnant woman model is particularly complex structure involving numerous tissues with different electrical parameters. Such complex structures are generally handled by numerical methods implemented in simulation software packages. The structures involving high discretization density (mainly based on Magnetic Resonance Imaging and handled by Finite Difference Time Domain method) consume tremendously...
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In this paper the human body absorption characteristics in terms of absorption effectiveness and absorption cross section were studied. In semi-reverberant environments such as passenger transit vehicles (planes, trains, buses and cars), elevators, factory halls, cargo-container workplaces, etc., people present the most common loading that influences the electromagnetic field (EMF) characteristics...
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A novel approach is introduced for measuring the shielding effectiveness in resonant conductive enclosures having apertures in a removable side wall. The measurement setup was based on GTEM cell as a compact field-generating environment, capable of accommodating small enclosures as DUTs. The signal was fed into the GTEM cell, thus creating a controlled incident field impinging on the enclosure. The...
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In this paper, the human exposure to electromagnetic field radiated from the RFID anti-theft gate system is analyzed. Anti-theft gate system is based on two parallel coaxial square loop antennas. Simplified parallelepiped human body model is used for the SAR calculation. The obtained results were analyzed according to ICNIRP guidelines and were found to be below appropriate limits, regarding both...
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This study deals with the radiation pattern and impedance calculation for a quarter wavelength monopole antenna placed at the center of circular and square perfect electric conductor (PEC) ground planes. The analysis is based on analytical approximations as well as on two different numerical methods, namely the Method of Moments (MoM) and the Finite-Difference Time-Domain method (FDTD). The previously...
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A novel method for measuring the shielding effectiveness of a resonant metallic enclosure having apertures in a side wall is presented. The enclosure was resonant with respect to the frequency range of interest, preventing the usage of the methods described in literature. The setup is based on GTEM cell as a compact field-generating environment, capable of accommodating smaller enclosures. The enclosure...
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Electromagnetic modeling of large scale problems arising from complex geometries, such as the human body or the specific organ, is generally undertaken by numerical methods implemented in simulation software packages. The structures involving high discretization density (mainly based on MRI images and handled by FDTD method) consume tremendously high computational cost. On the other hand, oversimplified...
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The paper analyzes the influence of human head and hand on planar inverted F antenna (PIFA) matching properties. Since PIFA is a very popular design in mobile applications, it is of primary importance to analyze the matching of such an antenna in real application scenarios (close to the head, grasped by the hand). Any matching deviation leads to the reduction of radiated power which should be accounted...
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The parameters of antennas printed on electrically thin ungrounded substrate are usually found by simulations or by trial and error method because the value of its effective dielectric constant is unknown. In this paper the effective dielectric constant of a dipole printed on some commonly used substrates, with standard thickness and relative permittivity, was found and its eventual effect on antenna...
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Radiation pattern of a commonly used vertical half-wave dipole was measured over sea. A compact setup was designed and produced based on a shallow pool filled with sea water, defining the propagation path entirely over sea. Antenna under test transmitted a wave across the pool towards the receiving antenna that measured the field strength in various positions, to obtain the radiation pattern of the...
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The paper presents the design and the response measurements of the simple, one-axis diode-based electric field probe, consisting of short dipole, diode detector, low-pass filter, transmission line and monitoring instrument. Frequency response measurement results were compared to the simulation results, where simulation was achieved by a method of combining the numerical FDTD simulation with dipole/diode...
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International Journal of Hygiene and Environmental Health > 2011 > 214 > 1 > 59-65
Due to increased usage of microwave radiation, there are concerns of its adverse effect in today's society. Keeping this in view, study was aimed at workers occupationally exposed to pulsed microwave radiation, originating from marine radars. Electromagnetic field strength was measured at assigned marine radar frequencies (3GHz, 5.5GHz and 9.4GHz) and corresponding specific absorption rate values...
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IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 1041 - 1044
Electric field probes based on diode-loaded short dipoles bear an inherent limitation of use concerning the signal waveform. When measuring signal waveforms other than sinusoidal, probes can show a considerable measurement error. Although this error has been recognized before, its importance is growing lately due to expansion of new modulation schemes. Therefore, a convenient measurement setup and...
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The paper presents the method for measuring antenna factor and gain of small antennas in the GTEM cell. In order to investigate the suitability of GTEM cell for this kind of measurement, the measurement results for a biconical dipole with broadband matching balun were compared with those obtained by calibration inside fully absorber lined anechoic site. The GTEM measurement results showed great agreement...
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The radiation hazard (RADHAZ) survey is commonly done using field strength probes. These probes are inherently wideband and thus non-selective, what makes them a good choice for quick wideband surveys. On the other hand, this characteristic presents a problem when trying to discriminate signals in a multifrequency environment. The most commonly used diode-based probes have another significant drawback:...
