Fletcher, S H; Alexander, M J; Jee, J C; Liang, W; Loader, B G (2000) Effect on the E-field distribution of ferrite tiling on the walls of the MEB 1750 GTEM cell. NPL Report. CETM 18
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Abstract
GTEM cells (GigaHertz Transverse ElectroMagnetic) devices are used by EMC test houses to carry out EMC radiated immunity testing and also for measuring radiated emissions from electrical products. They provide a compact alternative to measuring on Open Area Test Sites (OATS) or anechoic chambers and are free from the effects of ambient interference as found on OATS. GTEMs are suggested as alternative test sites in IEC standards however, despite being in existence for over ten years, there are still some problems to be resolved. The most notable is a significant longitudinal E-field component that appears at different frequencies depending on the size of the GTEM. The cell used at NPL is the MEB GTEM 1750, which displays this cross-polar component at around 125 MHz. A possible solution is presented in this report, that of lining the side walls of the GTEM with ferrite absorber tiles in the expectation that this will reduce the cross-polar component without significantly reducing the vertical E-field.
Item Type: | Report/Guide (NPL Report) |
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NPL Report No.: | CETM 18 |
Subjects: | Electromagnetics |
Last Modified: | 02 Feb 2018 13:17 |
URI: | http://eprintspublications.npl.co.uk/id/eprint/1545 |
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