Design and simulation of a mode suppressed GTEM cell

A methodology combining the general design principles of the GTEM-family, the wall absorber suppression method and the FRCTEM approach is proposed for designing a mode suppressed GTEM cell. Wall absorbers are used to dampen higher order TE modes, whereas the lumped element resistors with or without a parallel capacitance across the network are combined with ferrite tiles and pyramid foam absorbers to suppress essential TM modes. Application of our method leads to cells with an improved field uniformity, enhanced working volume, a maximized upper frequency limit and minimized cell impedance mismatch.