Air-gap type FBAR, and duplexer using the FBAR

Details Air-gap type FBAR, and duplexer using the FBAR Air-gap type FBAR, and duplexer using the FBAR

2007-06-19

2007-06-19

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S187000, C310S349000

Reexamination Certificate

active

11429256

ABSTRACT:
An air-gap type film bulk acoustic resonator (FBAR) is created by securing two substrate parts, one providing a resonance structure and the other providing a separation structure, i.e., a cavity. When the two substrate parts are secured, the resonance structure is over the cavity, forming an air gap isolating the resonant structure from the support substrate. The FBAR may be used to form a duplexer, which includes a plurality of resonance structures, a corresponding plurality of cavities, and an isolation part formed between the cavities. The separate creation of the resonance structures and the cavities both simplifies processing and allows additional elements to be readily integrated in the cavities.

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