Optimal design of low-pass filters using open stubs to control the out-of-band

This paper reports on a new synthesis of low-pass filter using open-circuited stubs, leading to the improvement of the out-of-band response. In this purpose, additional technological parameters are introduced. This leads to an optimal choice of both of the length and characteristic impedance of the different elements constituting the filter, depending on the involved technology characteristics. The proposed synthesis is validated by experimental results.