BULK ACOUSTIC WAVE DEVICE INCLUDING PATTERNED ACOUSTIC MIRROR LAYERS TO REDUCE EFFECTIVE THICKNESS AND RELATED METHODS

Abstract: in an acoustic mirror of a bulk-acoustic wave (baw) device, acoustic energy is reflected at interfaces of layers having different acoustic impedances, and the wavelengths of the acoustic energy reflected at each layer depends on the layer thickness. the acoustic mirror comprises a patterned layer including a first region of a first material and a second region of the first material separated by a second material to reduce an effective thickness of the layer for acoustic reflection. as operating frequencies in wireless devices increase, current manufacturing practices may be unable to produce the correspondingly thinner layers of the acoustic mirror. thus, the baw device described herein can be employed to provide a reduced effective thickness for acoustic reflection with layers having an actual thickness that can be formed by existing manufacturing practices. in some examples, the first material and the second material have different acoustic impedances.

Inventor(s): Marc Esquius Morote

CPC Classification: H03H9/175 (IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing ; arrangements for producing a reverberation or echo sound ; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, ; control of amplification, e.g. bandwidth control of amplifiers, ; tuning resonant circuits, e.g. tuning coupled resonant circuits, ; networks for modifying the frequency characteristics of communication systems ))

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