The GTEM cell is a frequency extended variant of the traditional TEM (Transverse Electro-Magnetic) cell. The GTEM cell is, in principle, a tapered coaxial line, from a coaxial feeding point, having an air dielectric and a characteristic impedance of Z = ۵۰ Ω. This coaxial line is terminated by a combination of discrete resistors and RF absorbers to achieve a broadband match. The outer conductor of this “coax line” is created by the metal walls of the cell which provide screening for both internal and external electromagnetic fields. We can reach to more space which implements this kind of cell to perform EMC tests, and it can be said that all the tests performed in the TEM Cell can be performed in  the GTEM Cell as well.