A filtering device including a
transmission line between an input and an output and a
resonator, wherein a first
microstrip track, a first micro-electromechanical
system (MEMS) component, and a second
microstrip track are connected in series between the
transmission line and a ground point, and a second MEMS component is connected in parallel with the second
microstrip track, the first and second MEMS components being switchable and being controlled by a circuit controlling the open or
closed state of each of the first and second MEMS components, allowing the filtering device to be placed either in an all-pass operating mode or in a band-stop operating mode about a characteristic frequency of the
resonator.