Tomasz Dlugosz

Cylinder model of human body impedance based on proximity effect

Problems on average electrical impedance are tackled for human body, when taking into account reflection influences of conducting medium in vicinity of human body. A cylindrical model of human body was proposed to analyze electrical properties of tissues and organs, which have certain information facilitating to determination of healthy state of human body. Function relationship was discussed between human body dimension and dimension of exposure system. Resistance and capacitance, as the result of simulation, reduce with ratio of human body dimension to that of transverse electromagnetic cell(TEM).

A Puzzle: How to Prove the Pythagorean Theorem in Antenna Analysis? [Letter to the Editor]

Recently, I had to use the Pythagorean Theorem in my antenna analysis, and I encountered a problem. I would like to [pose the following question] to the readers seeking help with the solution.

Property of sub-process transition in short gap electrostatic discharge with electrode moving speed to target

Spark discharge can be described with Townsend theory or streamer discharge theory. Short-gap electrostatic discharge(ESD) is a special electric spark and related largely to gas pressure variation. Transition characteristics of two subprocesses, surface process and avalanche process, are considered in short gap ESD. Simulation results from numerical algorithm verified primarily theoretical description of electrode moving speed effect on discharge parameter in short gap ESD. Electrode large speed reduces the influence from avalanche process while enhances the action of surface process in the entire process of electrostatic discharge.

Some consideration on electromagnetic compitibility in can bus design of automobile

Controller Area Network (CAN) bus design in automobile need to take into account aspects on electromagnetic compatibility (EMC) for components, PCB, and system. With filter and connecting approaches considerations are presented in the work for protection of CAN bus system in automotive from electromagnetic interference.

What About Quasi-Spherical Polarization? A Comment on “Polarization Characteristics of Coherent Waves” [Letter to the Editor]

In the June issue of the IEEE Antennas and Propagation Magazine, a very interesting paper devoted to different kinds of polarizations may be found [1]. The basics of linear and circular polarization have been described. I would like to mark here the importance of polarization in absorbed electro magnetic power estimation, and a role that may be played by this factor in the accuracy of biomedical experiments that is not negotiable. This is one of the reasons why this issue should be constantly reminded and re-discussed. Also, as a comment to [1], I would like to add that maybe it would be worth considering a concept of quasi-spherical polarization, too?

A new solution for biomedical experiments.

Abstract This article discusses mutual interactions phenomena especially in the case of Transverse ElectroMagnetic (TEM) cell applications as an exposure system in technical and biomedical studies. Problem of mutual interactions between tested objects placed in the electromagnetic field (EMF) is described. A new device for exposure system is presented. Its role is elimination of mentioned harmful phenomenon that leads to falsifications of results.

Exposure systems for bioelectromagnetic experiments

Abstract One of the most interesting questions in bioelectromagnetics is why there is a difference between results of experiments performed in various labs in “identical” conditions. One of the possible reasons is the difference of investigated objects, especially while performing experiments in vivo. However, the authors, as engineers, would like to focus readers’ attention on the technical aspects of exposure systems, especially the presence and role of mutual interaction between biological objects under test (OUT) and the exposure system, the interactions between the objects, the role of polarization, the similarity of real exposure to that applied in experiments etc. All these factors may alter the results of experiments and lead to false conclusions.

Is always high-resolution human model in bioelectromagnetic modeling needed?

The paper presents short profile of analytical and numerical methods used in bioelectromagnetic modeling. Some comparison of different models of human being was made. Author analyzed it in the following points of view: time of calculations and technical specifications

Impedance estimation with cylinder model of human body

Taking into account reflection influences of conducting medium in vicinity of human body, cylinder model and corresponding equivalent circuits are proposed for human body impedance calculation, and simulation results are provided. Analysis is provided for the features of cylinder model and potential biomedical engineering application of the model.