FBAR ladder filter and method of grounding of FBAR ladder...

Wave transmission lines and networks – Plural channel systems – Having branched circuits

Reexamination Certificate

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C333S189000, C333S191000, C333S0990MP

Reexamination Certificate

active

06972641

ABSTRACT:
A FBAR ladder filter which may yield less degradation in the stopband near the passband edges than conventionally grounded FBAR ladder filters. For that purpose a thin film resonator (FBAR) ladder filter having a plurality of serially-coupled FBAR elements, each serially-coupled FBAR element including an upper metal electrode and a lower metal electrode, and a plurality of shunt-coupled FBAR elements, each shunt-coupled FBAR element including an upper metal ground electrode providing a ground node and a lower metal electrode, is provided with at least one capacitor element including an upper metal electrode and a lower metal electrode, wherein each capacitor element is serially coupled between two ground nodes so that the inductive coupling of the shunt-coupled FBAR elements is compensated.

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patent: 2004/0085161 (2004-05-01), Kushitani et al.
patent: 2004/0124952 (2004-07-01), Tikka
patent: 101 27 655 (2003-01-01), None

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