Analysis of the effects of substrate parameters on the performance of RF MEMS tunable microstrip bandpass filters

In this paper an RF microelectromechanical (MEMS) tunable bandpass filter is designed for 3-4.2 GHz and the effect of substrate parameters was analyzed. The bandpass filter is achieved by adjusting the coupling parameters of microstrip resonator. The microstrip resonator is designed by coupling more than one microstrip lines resulting in the independent tuning of center frequency, bandwidth and quality factor. The simulative analysis of the effect of substrate parameters in microstrip bandpass tunable filter is performed using COMSOL Multiphysics software.