Bulk acoustic wave filter and method for eliminating unwanted side passands

摘要

The present invention relates to a bulk acoustic wave (BAW) filter (40) fabricated from thin film bulk acoustic wave resonators and a method for eliminating unwanted side passbands. This BAW filter comprises a substrate (14) a resonator section (11) and an acoustic mirror section (12). Further it comprises a detuning component (31) positioned in said resonator section (11) to provide precise passband characteristics and an additional detuning component (41) in said acoustic mirror section (12) to suppress unwanted side-passband characteristics. <IMAGE>