By Philippe Besnier
Devoted to a whole presentation on all facets of reverberation chambers, this e-book presents the actual ideas in the back of those try platforms in a truly revolutionary demeanour. The precise landscape of parameters governing the operation of electromagnetic reverberation chambers info a variety of purposes resembling radiated immunity, emissivity, and protecting potency experiments.
In addition, the reader is supplied with the weather of electromagnetic conception and facts required to take complete good thing about the elemental operational ideas of reverberation chambers, together with calibration methods. Comparisons with different trying out platforms (TEM cells, anechoic chambers) also are discussed.
Chapter 1. place of the Reverberation Chambers in universal Electromagnetic Tests
Chapter 2. major actual positive aspects of Electromagnetic Cavities
Chapter three. Statistical habit of Stirred Waves in an outsized Cavity
Chapter four. influence of the actual and Technological Parameters of a Reverberation Chamber
Chapter five. Radiated Immunity assessments in a Reverberation Chamber
Chapter 6. Emissivity assessments in Reverberation Chambers
Chapter 7. dimension of the protective Effectiveness
Chapter eight. Mode Stirring Reverberation Chamber
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Extra resources for Electromagnetic Reverberation Chambers
In keeping with the discussion started about the error generated during the immunity test, the Pc measurement is also concerned by a systematic error, due to the electric coupling occurring between the loop and the septum. 9 by the current source Ic (dotted line). 9. If the loop has sufficiently low impedance, the voltage VB will be of very low amplitude. This factor will thus reduce the current contribution Ic, without however completely eliminating it. From this electric coupling a systematic error will result in the measurement of the loop emission.
Their value is inversely proportional to the dimension L0 of the 1D cavity. These specific wave numbers, still called eigenmodes, are dependent on the integer number n that determines their position of appearance. 3, if we feed the cavity with a current source of amplitude I0 located at the point of coordinate z0, the voltage variation as a function of the space variable z will be determined by two functions V1(z) and V2(z), depending on whether the observer is located above or below z0. 3. 13], a look at the previous equations shows that the excitation of the cavity on a frequency rigorously equal to the frequency fn attached to the eigenmode of index n, produces a voltage with an infinite amplitude.
Note that the empty squares correspond to the N-3 resonators absent from the figure. The use of this assembly of resonators simplifies the understanding of some physical phenomena encountered in the cavities, such as in the case of the quality factor. 4 shows that, when fed by a sine wave current source I0 f with angular frequency ω, the reactance X(ω) tends to infinity as soon as ω tunes with one of the angular frequencies of resonance ωn of the resonators. Now, if we imagine that the line is supplied by a similar source whose angular frequency tunes exactly with ωn, the cavity reaches the eigenmode “n”.