The effect of magneto-dielectric absorbing coating on unsymmetrical antenna cables

Vogt-Ardatjew, Robert; Sowa, Andrzej E.; Leferink, Frank

doi:10.1109/apemc.2015.7175365

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…However, the fundamental difference deciding about small invasiveness of the OMST is the lack of a cable connecting a probe and a receiver, as in case of a receiving probe. The presence of the cable is the essential threat for the field measurement quality [7] and makes it simply impossible to obtain reliable results in spots difficult to reach.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the loading effect on the optically modulated scatterer

Sowa

Vogt-Ardatjew

2016

2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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In this paper, the evaluation of the loading effect in the Optically Modulated Scatterer has been presented. A chosen location in the vicinity of a pyramidal absorber has been analyzed. The loading effect as a function of the distance between the scatterer and the absorber has been investigated. Moreover, the loading effect vs. the scatterer size has been analyzed. The results obtained can be useful for assessment of the probe influence on the measured field.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the loading effect on the optically modulated scatterer

Sowa

Vogt-Ardatjew

2016

2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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“…The previously used monopoles had a rather small ground plane, possibly allowing the connecting cable shield to act a part of the antenna [63]. In this order, an entirely new measurement setup was prepared utilizing different technique and equipment thus eliminating any potentially influential imperfections of the previous setup.…”

Section: Extended Testsmentioning

confidence: 99%

Electromagnetic fields in reverberant environments

Vogt-Ardatjew¹

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SummaryThe phenomenon of resonating electromagnetic (EM) fields has been commonly and successfully exploited in reverberation chambers (RC) for the purpose of electromagnetic compatibility (EMC) testing, as well as modeling multipath environments. An RC is designed to maximize the amount of reflections while minimizing the losses, thus creating a statistically uniform, isotropic, and randomly polarized field. Due to the desired very high complexity of such a field, its description is best done statistically. Although largely successful, the currently used statistical models allow for a certain degree of freedom, especially with regard to defining the extreme field strengths, which are also the main cause of electromagnetic interference (EMI). Furthermore, some actual multipath, enclosed environments such as airplane fuselages, ships, or even building interiors, can unintentionally possess the ability to create enough strong reflections so that the resulting resonating EM field within them resembles the field inside a dedicated RC. Those reverberant environments (RE) can therefore utilize the methods and techniques similar to the ones used in laboratory conditions. Due to the very high complexity and diversity, resulting in increased difficulty of both numerical or analytical description of the REs, the analysis performed throughout this work is mainly experimental. Such an approach allows to bypass the often unreasonable or too generalized assumptions of the available models while utilizing purely empirical data.The initial step made in this thesis focuses on introducing REs as environments sharing multiple aspects of EM field shaping with RCs. The experimental analysis has been performed on two example REs by means of quality factor (Q-factor), insertion loss (IL), as well as goodness of fit (GOF) tests. The results, although highly variable with frequency, indicate a possible similarity to a referential RC analyzed alongside. Furthermore, due to the difficulty of collecting large amounts of data and parameter isolation in the REs, two dedicated chambers: a classical RC and the vibrating intrinsic reverberation chamber (VIRC), have been analyzed as candidates allowing to simulate an RE in laboratory conditions. By the means of Q-factor, k-factor, GOF, as well as number of samples, related to field repeatability, it has been shown that the VIRC provides substantially better conditions for the given purpose.The search of maximum field strengths in reverberant environments has been performed by exploiting the capability of the VIRC to efficiently generate large amounts of independent samples. Performing 1-hour long measurements in the VIRC allows to obtain the desired results with very high repeatability, while giving space for parameter isolation. The first hypothesis states that the maximum-to-average (max/avg) electric field ratio depends on the losses of the environment. The measurement campaign performed to test it consisted of multiple setups with highly spread Q-factors, additionally creating a link between...

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“…P i can be defined as the summation of P r and the losses within both the body tissues and the antenna structure itself, P loss . In the measurement of implant antennas, P r consists of the power radiated by the AUT (P aut ) and any spurious radiation from the feed cable (P cable ) [26], [27]. Therefore, the measured implant antenna efficiency, η meas , is:…”

Section: B Feed Cable Effectsmentioning

confidence: 99%