Reconfigurable filtering device and system for acquiring radiofrequency signals incorporating such a filtering device

A reconfigurable filtering device comprising:

• an input terminal to which a signal to be filtered is applied;
• an output terminal to which a filtered signal is delivered;
• a transmission line connecting said input terminal and said output terminal;
• and
• a resonator connected, via a first capacitor, to said transmission line and, via a second capacitor, to a first node brought to a reference potential, the resonator comprising:
• a first microstrip track, connected both to the first capacitor and to a first intermediate node;
• a second microstrip track, connected both to a second intermediate node and to the second capacitor;
• a first MEMS component connected between the first intermediate node and the second intermediate node so as to be placed in series between said first and second microstrip tracks;
• and
• a second MEMS component, connected between the second intermediate node and a second node brought to the reference potential so as to be placed in parallel with said second microstrip track, said first and second MEMS components operating as a switch and being controlled by a control device controlling the open or closed state of each of said first and second MEMS components serving to place the filtering device in either an all-pass operating mode, or in a band-stop operating mode around a characteristic frequency of the resonator.