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This paper deals with the TEM cross-correlation method (TCCM) to qualify and characterize transverse electromagnetic (TEM) waveguides for arbitrary transient signals. In previous papers the applicability of the TCCM to waveguides was shown. The aim of this investigation is to apply the established limits of the various standards (e.g. the IEC 61000–4–20 Annex C) to this new method and determine the...
The standard IEC 61000–4–20 describes the test procedures in coaxial transmission lines, including a so called correlation method, in order to compare emission test results measured in a GTEM cell with the limits given by the product standard. One parameter that has to be taken into account is the directivity of the test object, characterizing its radiation pattern. The standard assumes a constant...
CISPR 12 defines the outdoor test site (OTS) as preferred test site and states that an absorber lined shielded enclosure (ALSE) can be used if the results gained there match those obtained on outdoor test sites OTS. The investigation of real sites with a validation method as proposed in [5] is very time consuming. The comparison of real world data with simulation models shall show the feasibility...
Power noise waveforms within cryptographic VLSI circuits in a 65 nm CMOS technology are captured by using an on-chip voltage waveform monitor (OCM). The waveform measurements emphasize the correlation of dynamic voltage drops to internal logical activities during the processing of Advance Encryption Standard (AES), and resolve the physical processes in the information leakage of such as secret key...
The uncorrelated stirrer positions of a reverberation chamber are computed by means of Pearson's correlation matrix. Two methods are adopted to populate the matrix, and results are compared with those given by standard method. The former uses the total electric field magnitudes sampled in a large spatial lattice in the working volume for each stirrer position. The latter uses the same quantity sampled...
A method for estimating the number of independent stirrer positions in reverberation chambers is described in IEC 61000–4–21 [5]. This standard method is known to have disadvantages that have been discussed e.g. in [7] and [10], but it is a practical way to estimate the number of independent stirrer positions with comparatively low effort. Beside this standard method there are different alternatives...
An original method allowing to define from measurements a specific frequency called “Quasi-Ideal Reverberation Chamber Minimum Frequency” (QIRCMF) is presented. This frequency corresponds to the frequency where a mode stirred reverberation chamber starts to work “quasi-ideally”. The method is based on 1) the assessment of the electromagnetic field distributions obtained in the working volume (in comparison...
Reverberation chamber is used to characterize the diversity gain based on its properties of diffuse field. First, we isolate the effects on diversity gain due to different factors, resulting in a composite power imbalance. Then, we describe the power correlation as a function of the complex correlation when the K-factors on different channels are not identical. By using Monte Carlo simulations, we...
We explore the effect of loading a reverberation chamber on the calculation of the correlation coefficient of two-element antenna arrays (similar to the type used in multiple-input multiple-output (MIMO) wireless devices). The changes in correlation coefficient with loading are compared to the changes in a squared, mismatch-corrected version of the transmission coefficient 〈|Sxy|2〉 as a function of...
This paper presents analyses of data in view of obtaining a possible correlation between geomagnetic activity and protection trips in a 138 kV–197.12 km power transmission line in southern Brazil. Most of these outages are caused by faults randomly located along the line. In consequence, many studies have been done to identify the main reason for these events, now including the investigation of the...
Localization algorithm for stochastic EMI sources based on time domain planar near-field scanning of tangential electromagnetic field components emitted by a complex radiated structure is presented. The main theory aspects of the field reconstruction in the object plane as well as the main limitations for scanning parameters are also discussed for the proposed localization procedure. The autocorrelation...
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