Integrated RF Filter Layout for Wider Passband and High Rejection

By integrating the passive components directly onto the same die as the resonance device, the patent eliminates external electrical connections and associated transmission losses. The components are electrically connected through internal metallization layers, significantly reducing energy loss while enhancing reliability through a more robust integrated structure.

The patent transitions from a planar two-dimensional layout to a three-dimensional vertical integration architecture. Passive components are stacked above or below the resonance device, connected through vertical vias and conductive layers. This dimensional change enables shorter electrical paths, reducing transmission losses while maintaining device reliability.

The patent employs a composite filter structure that combines SAW/BAW resonator elements with additional filtering components in an integrated architecture. This composite design leverages the high out-of-band rejection characteristics of piezoelectric resonators while incorporating broadband matching networks and additional resonant elements to extend the effective passband width, achieving both high rejection and broad bandwidth.

The patent segments the filtering function into multiple independent resonant elements and passive components that are integrated on the same die. By using multiple resonators with different frequency characteristics and combining them through carefully designed coupling networks, the system achieves high out-of-band rejection at specific frequencies while maintaining a broader overall passband, thus resolving the bandwidth limitation of single resonator designs.