Analysis of Higher-Order Mode Effects in the Resistively Loaded Monocone TEM Cell

This article proposes a method to obtain the analytic solution of electromagnetic field inside the practical finite monocone transverse electromagnetic (TEM) cell. The higher-order modes existing in a practical monocone TEM cell are solved and analyzed for the first time, which explains the field distortion corresponding to the ideal standard field. The proportionality factors of these modes are determined by comparison with simulation results. The calculation results (i.e., sum of modes) are consistent with simulation and experimentally validated. This work can be used for monocone design of eliminating higher-order modes and expanding the time window, and mode analysis for other kinds of TEM cells.