Comparison of EMC Chamber Debugging Techiniques above 1GHz

Le résumé fourni par la source

Site VSWR test is specified in the CISPR 16 standards for evaluating sites above 1GHz. The CISPR Svswr method consists of a series of scalar measurements and offers no additional information on how one can debug a chamber failure. The Time Domain site VSWR method specified in ANSI C63.25.1 standard is an alternative site validation method. The TD Svswr method yields more consistent data and provides equivalent results to the CISPR Svswr method. The time domain impulse view, obtained through inverse Fourier transform of the vector response measurement in the frequency domain, can provide valuable chamber debugging information. The path length of a large reflection can be identified in the time domain. However, no information about the directions of the unwanted reflection signal can be extracted. In this study, a chamber imaging method is presented from phase coherent measurements using a 2D planar scanner. Angular spectrum in K-space is computed from the Fourier transform of the planar scanned 2-D data. A 2-D image of chamber reflections is constructed after mapping the K coordinates to azimuth-elevation angle coordinates. The chamber image shows both the signal levels and the directions, allowing a more comprehensive reflection signal analysis and chamber debugging. In this paper, the two techniques (i.e., time domain method and chamber imaging method) are presented and compared for chamber debugging in a 3m EMC anechoic chamber.

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