Filter that is variable by means of a capacitor that is switched using MEMS components

摘要

A tunable filter comprises at least two resonator circuits placed between two matching networks characterized in that: one resonator is connected at a first of its ends to the ground plane M of the filter by metallized holes and at a second end to a MEMS network; the distance between the two resonators forms an inter-resonator inductive coupling circuit; an inter-resonator coupling capacitor is formed by two etched lines connected to the first and second resonators; the MEMS networks are distributed around the ends of the resonators; the MEMS networks are connected between the first and second resonator and the ground plane M by means of metallized holes; and the filter comprises a number of independent electrical control voltages designed to actuate the MEMS.

主权项

1. A tunable filter comprising:
at least two resonator circuits including a first resonator and a second resonator placed between a first matching network connected to a first input/output and a second matching network connected to a second input/output, wherein said first and second matching networks include an inductor and a capacitor connected in parallel, and in that: the first resonator of the at least two resonator circuits is connected at a first of its ends on one side to a ground plane (M) of the tunable filter by metallized holes and at a second end to a Micro Electro-Mechanical System (MEMS) network in a plurality of MEMS networks; a distance (d) between the first resonator and the second resonator forms an inter-resonator inductive coupling circuit; an inter-resonator coupling capacitor is formed by two etched lines that are connected to the first and second resonators, respectively; the MEMS networks are distributed around the ends of the first resonator and the second resonator; the MEMS networks are connected between the first resonator and the second resonator and the ground plane (M) by virtue of vias or metallized holes; and the tunable filter comprises a number of independent electrical control voltages (Vi) adapted to actuate the MEMS.