Expanding the Bandwidth of TEM Cells for EMC Measurements
- 1 August 1978
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electromagnetic Compatibility
- Vol. EMC-20 (3) , 368-375
- https://doi.org/10.1109/temc.1978.303664
Abstract
This paper discusses the development of a modified (absorber-loaded) transverse electromagnetic TEM cell with expanded bandwidth for use in accurately characterizing electromagnetic interference (EMI) fields within a shielded environment. The cell is analyzed experimentally, both before and after the modification, to determine its radio-frequency (RF) characteristics, both as an RF transmission line and as an electromagnetic (EM) field simulator or detector. Comparative measurements are given to show the performance of the modified versus the unmodified cell in parameters such as voltage standing-wave ratio (VSWR), insertion loss, test-field uniformity, and reverse-coupling characteristics. The results of these measurements indicate an approximate two-fold increase in the upper useful frequency of the modified cell. An example of using the cell to evaluate the radiated emissions from a common electronic module (microprocessor timing circuit) is given. Finally, the technique of absorber loading is extended to larger cells, specifically a 3- × 3- × 6-m cell.Keywords
This publication has 3 references indexed in Scilit:
- An analytical and experimental determination of the cutoff frequencies of higher-order TE modes in a TEM cellPublished by National Institute of Standards and Technology (NIST) ,1976
- Radiation characteristics of dipole sources located inside a rectangular, coaxial transmission linePublished by National Institute of Standards and Technology (NIST) ,1976
- Generation of Standard EM Fields Using TEM Transmission CellsIEEE Transactions on Electromagnetic Compatibility, 1974