ladder -type thin film resonator filters , duplexers and ladder -type filter grounding method

摘要

The grounding method of the FBAR ladder filter and the FBAR ladder filter . ; passband FBAR ladder filter which may be less degraded than conventionally grounded FBAR ladder filter in which the stop band close to the edge . For this purpose, a plurality of series-connected FBAR element including an upper metal electrode and each of the lower metal electrodes , respectively, to provide a ground node having a plurality of shunt connected FBAR element including an upper metal ground electrode and a lower metal electrode, the thin film resonator (FBAR), provided with at least one capacitor element including an upper metal electrode and a lower metal electrode , and , connected in series between the capacitor element has two ground nodes to compensate for the inductive coupling of the shunt FBAR elements connected It is .