Avago Technologies International Sales Pte. Limited

Zongliang Cao

Qiang Zou

David A Feld

Andrew Thomas Barfknecht

Jing Wu

Mohamed Abd Allah

Siamak Fouladi Azarnaminy

Guiti Zolfagharkhani

A BAW resonator includes a nonlinear substrate defining a cavity, and an acoustic stack over the cavity, including a bottom electrode, a piezoelectric layer, and a top electrode, where an active region of the acoustic stack includes overlapping portions of the cavity, the bottom electrode, the piezoelectric layer and the top electrode. The BAW resonator further includes a connecting strip extending from a portion of the top electrode for providing electrical excitation of the acoustic stack, where an E-field generated in the BAW resonator begins at the top electrode and terminates at the bottom electrode in response to the electrical excitation. The cavity includes an inner portion in the active region and an extended portion extending from an outer perimeter of the active region underneath the connecting strip. A length of the extended portion are sufficient to substantially prevent portions of the E-field from passing through the substrate.

Acoustic resonator including extended cavity

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Zongliang Cao