What is a GTEM?
GTEM - Gigahertz Transverse ElectroMagnetic Cell
A closed measuring device consisting of an inner and an
outer conductor in which a voltage difference creates a TEM-mode electromagnetic
field between these conductors. Two-port TEM cells typically have symmetrical
tapered input and output ports, whereas a one-port TEM cell typically
has a tapered input port and a integral, closed nontapered termination
in place of the output port.
An open or closed transmission line system that uses the
TEM mode over the frequency range of interest. The TEM mode is defined
as an electromagnetic field in which the electric and magnetic field vectors
are orthogonal to each other and orthogonal to the propagation direction.
Common examples are the two-port TEM cell (Crawford cell), the one-port
or wideband-TEM cell (example GTEM), and the parallel-plate stripline.
A TEM cell that has been altered to extend the usable frequency
range. Typically, this is achieved by replacing one port of a two-port
TEM cell with a wideband, non-tapered, hybrid discrete resistor/wave absorber