Richards transformation and Kuroda rule are briefly introduced firstly as the theoretical support of the research. Then, based on the Richards transformation and the Kuroda rule description, the structure of a microstrip low-pass filter and its designing principle are empirically analyzed through circuit simulation and layout simulation. Based on the ADS2011 software platform, we give an example to carry out the design and simulation by calling macro function of ADS. The simulation process

more »

... ins four steps: Firstly, the basic values of the filter prototype are determined. Secondly, simulaton circuit is designed by using the Richards transformation and the Kuroda rule. Thirdly, intelligent computing for the microstrip line is carried out on the ADS2011 platform so as to form the layout. And fourthly, we employ the typing technique to modify the layout to control and ensure the exactness of the simulation. The simulation on the ADS software platform avoids the massive and complicated manual calculation and effectively shortens the designing period. Moreover, the satisfactory performance index is obtained