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Abstract
The first eight to ten  resonances have been identified in one large (6.1 x 7.3 x 13.0 m) and one small (1.0
x 0.6 x 2.0 m)
TEM cell. The resonant frequencies fir
a new equivalent coaxial box model with the effective length of the box
depending on the mode. Weakly propagating  modes were also
detected at frequencies above their respective first-resonance frequencies. A
biological body or metal box at the center of the
test zone interacts strongly with the  and  resonances, but not
with the  resonances. These
interactions cause bandwidth limitations in the use of TEM cells for bioeffects dosimetry studies,
EMC testing, and probe calibration work.
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