Simulation of direct measurement method for balanced and unbalanced mode of a small antenna

A simple measurement method for the balanced and unbalanced modal power ratios of a small antenna is proposed. Because the conductance corresponding to each mode can be calculated by applying the S-parameter method to the power dissipated at the antenna, the modal power ratio can be obtained by measuring only the 2-port S-parameters. In this paper, we demonstrate a simulation for the analysis of the modal power ratios of the folded dipole antenna using the proposed method. The results are in good agreement with the results calculated using the radiation pattern. The proposed method is useful for quantitative analysis of the unbalanced mode of an antenna mounted on a wireless device.