Tunable RF filter paths for tunable RF filter structures

摘要

This disclosure relates generally to radio frequency (RF) filter structures. In one embodiment, an RF filter structure includes a first resonator and a second resonator. The second resonator is operably associated with the first resonator such that an energy transfer factor between the first resonator and the second resonator is less than 10%. The first resonator includes a first inductor and a first capacitive structure electrically connected to the first inductor, while the second resonator has a second inductor and a second capacitive structure electrically connected to the second inductor. A displacement between the first inductor and the second inductor is less than or equal to half a maximum lateral width of the second inductor. To set an electric coupling coefficient, a first cross-coupling capacitive structure is electrically connected between the first resonator and the second resonator.