Characterization of loaded TEM-waveguides using time-domain reflectometry

Author

Kärst, J.P. ; Garbe, H.

Author_Institution

Inst. fur Grundlagen de Electrotech. & Messtech., Hannover, Germany

Volume

1

fYear

1999

fDate

1999

Firstpage

127

Abstract

An approach is presented to characterize the load state of a TEM-waveguide using the local characteristic impedance Z_c(z) derived from time-domain reflectometry (TDR) measurements. The field homogeneity and the field polarization can be estimated using the deviation from the intended Z_c=50 Ω of the empty TEM-waveguide. Considering wave propagation only in the TEM-mode an analytical relationship between load state and characteristic impedance is derived. Multiple reflections due to the nonuniformity of the loaded TEM-waveguide and higher order modes excited by the load are taken into account. Experimental results are presented using a GTEM-cell with several load states

Keywords

electric impedance measurement; electromagnetic compatibility; electromagnetic fields; electromagnetic interference; electromagnetic wave polarisation; electromagnetic wave reflection; time-domain reflectometry; waveguide theory; waveguides; EMC test sites; EMI; GTEM-cell; TDR; TEM-mode; emission measurement; empty TEM-waveguide; experimental results; field homogeneity; field polarization; higher order modes; load states; loaded TEM-waveguides; local characteristic impedance; multiple reflections; susceptibility measurement; time-domain reflectometry measurements; wave propagation; Impedance measurement; Polarization; Reflection; Reflectometry; Shape measurement; Testing; Thumb; Time domain analysis; Time measurement; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 1999 IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

0-7803-5057-X

Type

conf

DOI

10.1109/ISEMC.1999.812881

Filename

812881