Design Construction and Evaluation of a TEM Transmission Cell for Field Probe Calibration.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Pagination or Media Count:
This paper discusses the design, construction and evaluation of a transverse electromagnetic TEM transmission cell for accurate generation of broad-band susceptibility test fields within a shielded environment. A 0.3x0.5x1.0 m TEM cell, constructed at the Naval Postgraduate School NPGS, was designed to operate as a 50-ohm impedance-matched system and was used for calibrating electromagnetic field probes. According to the basic design, uniform and standard TEM fields can be generated inside the cell for frequencies lower than the cutoff frequency of the device. The high frequency multimode effects can be suppressed by loading the cell with radio frequency RF absorbing material thus increasing the useful bandwidth. Measurements of characteristic impedance distributed along the cell, voltage standing wave ratio VSWR and tests of field uniformity from 1-1000 MHz were taken and described for both empty and absorber loaded cells. The method and the results of calibrating two types of probes are also discussed. Author
- Electricity and Magnetism
- Radiofrequency Wave Propagation