The multi-layer perceptron is introduced to charcacterize the microstrip discontinuity by describing s-parameters.The size of the microstrip and the frequency are defined as the input samples of the multi-layer perceptron
and the S-parameters are determined as the desired output samples.As the perceptron has been trained with the back propagation algorithm
the S-parameters of the microstrip at any arbitrary sizes and frequencies can be obtained quickly from the perceptron.