General Method for Characterization of Power-Line EMI/RFI Filters Based on S-Parameter Evaluation

This paper deals with a general working approach for determining the lowest possible insertion loss of power-line interference filters in their stop bands at high megahertz or gigahertz frequencies. It is shown that at these frequencies, the measurement methods recommended for testing of interferenc...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2016-10, Vol.58 (5), p.1465-1474
Main Authors: Haase, Martin, Hoffmann, Karel, Hudec, Premysl
Format: Article
Language:English
Subjects:
Automation
Cascades
Common mode (CM)
differential mode (DM)
Electromagnetic interference
electromagnetic interference (EMI) filter
Frequency measurement
IEEE standards
Impedance
Impedance measurement
impedance tuner
information security
Insertion loss
Interference
Measurement methods
Microwave filters
Microwave measurement
power-line filter
radio-frequency interference (RFI) filter
Scattering parameters
Spectrum allocation
Transmission line measurements
Unknown environments
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Summary:This paper deals with a general working approach for determining the lowest possible insertion loss of power-line interference filters in their stop bands at high megahertz or gigahertz frequencies. It is shown that at these frequencies, the measurement methods recommended for testing of interference filters in available standards for frequencies up to 1 GHz fail in determining their lowest possible insertion loss. This problem is solved by the newly developed method which also enables the characterization of concerned filters in a completely impedance unknown environment. It is based on two-port vector network analyzer measurement and postmeasurement data processing applying an impedance matching technique. Experimental verification of the new method using two Maury Microwave automated tuners and a cascade of low-pass coaxial filters was performed in the frequency band from 6 to 12 GHz. The results show that measurement-evaluation procedures performed according to the newly developed method provide more reliable and precise results when compared to measurement procedures corresponding to methods described in common standards. The new method was also applied to the characterization of a professional EMI/RFI filter from 1 to 10 GHz.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2016.2583221