FDTD Modeling of a Vibrating Intrinsic Reverberation Chamber

Kouveliotis, N.K.; Trakadas, Panagiotis; Capsalis, Christos N.

doi:10.2528/pier02050804

Cited by 27 publications

(13 citation statements)

References 15 publications

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“…The use of a reverberation chamber, that is a metallic cavity whose dimensions are large with respect to the wavelength of the indoor electromagnetic field, can give a solution to the mentioned requirements. The internal electromagnetic field is characterized by stochastic values, but it is (on the average) uniform and isotropic one [14][15][16][17]. Particularly, the reverberation chambers are able to simulate usual habitat of the animals so that the problems related to the use of immobilized animals can be overcome.…”

Section: Introductionmentioning

confidence: 99%

A REVERBERATION CHAMBER TO INVESTIGATE THE POSSIBLE EFFECTS OF "IN VIVO" EXPOSURE OF RATS TO 1.8 GHz ELECTROMAGNETIC FIELDS: A PRELIMINARY STUDY

Biagi¹,

Castellana²,

Maggipinto³

et al. 2009

PIER

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Abstract-A system generating 1.8 GHz electromagnetic fields for bio-medical and behavioral study on laboratory animals was designed and implemented. The system is based on a reverberation chamber. An input power up to 5 W can be sent to an indoor transmitting antenna and an electric field strength (E) more than 90 V/m can be reached inside the chamber. The system was characterized at different input powers measuring E in different points by means of a miniature sensor. Then, boxes with 300 cc of physiological liquid inside were realized as simple phantoms simulating laboratory animals (rats)Corresponding author: P. F. Biagi (biagi@fisica.uniba.it). and E inside the liquid was measured, performing several simulations by moving the phantoms (1, 2) in the chamber and/or putting them still in different positions. On the basis of these measurements, the SAR (Specific Absorption Rate) and the Pe (power efficiency = SAR/input power) were determined at different powers. The actual system is characterized by a low power efficiency with respect to the "in vivo" exposition systems based on transversal electromagnetic (TEM) cells. Its advantage is to have inside the chamber a habitat similar to the usual one for the laboratory animals.

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Section: Introductionmentioning

confidence: 99%

A REVERBERATION CHAMBER TO INVESTIGATE THE POSSIBLE EFFECTS OF "IN VIVO" EXPOSURE OF RATS TO 1.8 GHz ELECTROMAGNETIC FIELDS: A PRELIMINARY STUDY

Biagi¹,

Castellana²,

Maggipinto³

et al. 2009

PIER

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show abstract

“…This loss model can be applied to the proposed modal-expansion method easily by computing the wavenumber using (10). σ can be determined by (11) and f 1 is set to 5 MHz for the model used in [8].…”

Section: Loss Modelmentioning

confidence: 99%

“…Moreover, measurement of small antennas may not need a large working volume. Therefore, alternative methods of stirring have been proposed, such as, electronic stirring [7][8][9], position stirring [8], vibrating intrinsic reverberation chamber (VIRC) [10] and vibrating reverberation chamber (VRC) [11,12]. The VRC is a metallic cavity with one of its walls vibrating.…”

Section: Introductionmentioning

confidence: 99%

Modal-Expansion Analysis of a Monopole in Vibrating Reverberation Chamber

Zhao¹,

Shen²

2008

PIER

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Abstract-A modal-expansion method is proposed for the analysis of a monopole antenna in a vibrating reverberation chamber. Inside the chamber, electromagnetic fields are expanded using modal functions. Mode matching process is applied to enforce the boundary conditions at regional interfaces. Boundary conditions on the four side walls of the chamber are imposed by the point matching method. Combining these two matching processes, a set of matrix equations are obtained and the expansion coefficients can then be determined accordingly. The loss from the chamber walls is accounted for through homogeneous material filling. The input impedance and scattering parameter of a monopole in a reverberation chamber are computed and statistical analysis of the scattering parameter is conducted when one of its walls is vibrating.

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“…probable [26,27,15]. Whenever the input field is perfectly stirred, the resulting electromagnetic field within the chamber (in one point) can be seen as the superposition of many independent plane waves from all directions and therefore the field is a complex Gaussian process.…”

Section: Measurement Setupmentioning

confidence: 99%

Diversity Techniques With Parallel Dipole Antennas: Radiation Pattern Analysis

Khaleghi¹

2006

PIER

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Abstract-Two parallel dipoles are assessed for antenna diversity. The three-dimensional radiation pattern is considered for signals correlation coefficient. The pattern analysis reveals that, depending on dipole spacing, three types of diversity techniques are generated: space, amplitude-pattern and phase-pattern diversity. The weighting of each technique in signals correlation coefficient mitigation is investigated. The results show that for closely spaced dipoles, the generated phasepattern diversity is the most dominant factor which greatly reduces the signals correlation coefficient.The diversity configuration is measured in a rich scattering environment. Results include signals correlation coefficient, diversity gain for selection combining and maximum ratio combining, effective diversity gain and antenna radiation efficiency can be demonstrated. We show that in rich multipath channel the minimum spatial distance, for effective diversity gain performance, is reduced from 0.5λ for uncoupled dipoles to 0.15λ for coupled dipoles.

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FDTD Modeling of a Vibrating Intrinsic Reverberation Chamber

Cited by 27 publications

References 15 publications

A REVERBERATION CHAMBER TO INVESTIGATE THE POSSIBLE EFFECTS OF "IN VIVO" EXPOSURE OF RATS TO 1.8 GHz ELECTROMAGNETIC FIELDS: A PRELIMINARY STUDY

A REVERBERATION CHAMBER TO INVESTIGATE THE POSSIBLE EFFECTS OF "IN VIVO" EXPOSURE OF RATS TO 1.8 GHz ELECTROMAGNETIC FIELDS: A PRELIMINARY STUDY

Modal-Expansion Analysis of a Monopole in Vibrating Reverberation Chamber

Diversity Techniques With Parallel Dipole Antennas: Radiation Pattern Analysis

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