Tunable Evanescent Mode Cavity Filter Using a Piezo Actuator

Application ID: 12619

An evanescent mode cavity filter can be realized by adding a structure inside of the cavity. This structure changes the resonant frequency lower than the dominant mode of the unfilled cavity. A piezo actuator is used to control the size of a small air gap which provides the tunability of the resonant frequency.

This model example illustrates applications of this type that would nominally be built using the following products: