抄録
The electromagnetic field emitted from UTP cable has been calculated by the 4-port network method from 30MHz to 1GHz. However it has not been clarified as to whether this method was effective in the frequency range of more than 1GHz or not. In this paper, the electromagnetic field emitted from UTP cable was calculated by the moment method and it was compared with the calculated results by the 4-port network method. The wire grid model was developed to represent the propagation constants of UTP cable. The comparison of calculated and measured results confirms the validity of the model. A hybrid coupler was used to generate differential mode signal for the measurement. The comparison indicated that the calculated results by the moment method closely agreed with the measured results in the frequency range of 0.3 to 2GHz and the difference was smaller than the results by the 4-port network method.
