High frequency filter

Details High frequency filter High frequency filter

2005-03-22

2005-03-22

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S189000, C333S190000, C333S191000, C310S357000

Reexamination Certificate

active

06870446

ABSTRACT:
A high frequency filter comprises thin film piezoelectric resonators connected in series between the input/output nodes, thin film piezoelectric resonators connected in parallel between the input/output nodes and a variable voltage circuit adapted to change the voltage applied to at least either the thin film piezoelectric resonators connected in series or the thin film piezoelectric resonators connected in parallel. The resonance characteristic of at least either the thin film piezoelectric resonators connected in series or the thin film piezoelectric resonator connected in parallel is shifted by changing the voltage applied by the variable voltage circuit to change the pass characteristic of the filter.

REFERENCES:
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patent: 5910756 (1999-06-01), Ella
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patent: 10-75149 (1998-03-01), None
patent: 2001-308605 (2001-11-01), None
John D. Larson, et al., “Power Handling and Temperature Coefficient Studies in FBAR Duplexers for the 1900 MHZ PCS Band”, 2000 IEEE Ultrasonics Symposium, pp. 869-874, Oct. 2000.

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