Multilayer IDT Electrodes With Mass Loading for Transverse Mode Suppression

The patent introduces a vertical stacking dimension by creating a multilayer electrode structure with alternating high-density and low-density material layers. This vertical arrangement allows the structure to achieve transverse mode suppression through layered density modulation rather than increasing horizontal dimensions, effectively resolving the contradiction between suppression performance and device size.

The patent employs composite material construction by combining multiple layers of different materials with varying densities. The alternating high-density and low-density layers create a composite structure that achieves effective transverse mode suppression while maintaining a compact overall size, avoiding the need for uniformly thick or dense materials throughout the entire device.

The patent segments the electrode structure into multiple discrete layers with alternating density characteristics. This segmentation allows each layer to be optimized independently for its specific function (high-density layers for mass loading, low-density layers for acoustic wave propagation), simplifying the manufacturing process compared to creating a single uniformly thick layer with complex properties.

The patent changes the density parameter across different layers rather than maintaining a uniform density throughout. By alternating between high-density and low-density materials in a systematic pattern, the structure achieves transverse mode suppression through parameter modulation, which is more manufacturable than creating a single thick layer with non-uniform density distribution.