The multi-layer perceptron is introduced to characterize the microstrip line．The size of microstrip line and the frequency are defined as the input saples of the multi-layer perceptron，and the electric characteristic parameters of the microstrip，which are obtained by the numerical method，are determined as the desired output samples．As the perceptron has been trained with the back propagation algorithm，the electric characteristic parameters of the microstrip line at any arbitrary size and frequencies can be obtained quickly from the multi-layer perceptron．
杨诠让，毫米波传输线．北京：电子工业出版社，1986，31-74．[2]Webb A R．Functional approximation by feed forward networks：A least squares approach to generation IEEE Trans．On Neural Network，1994，．NN-5(2)：363-371．
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