Frequency tunable device

Details Frequency tunable device Frequency tunable device

2007-05-22

2007-05-22

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Nonreciprocal gyromagnetic type

C438S003000, C438S396000

Reexamination Certificate

active

10982497

ABSTRACT:
A frequency tunable device includes a substrate, and a capacitor structure supported by the substrate and including a ferroelectric film and first and second electrodes. The ferroelectric film has two opposite sides, and is made from a ferroelectric material having a formula of Pb1−xBaxZrO3, where x is a positive number greater than 0.3 and less than 0.6. The first and second electrodes are respectively formed on the sides of the ferroelectric film. The dielectric constant of the ferroelectric film varies with a voltage applied to the first and second electrodes.

REFERENCES:
patent: 4367426 (1983-01-01), Kumada et al.
patent: 5182695 (1993-01-01), Handa et al.
patent: 5401716 (1995-03-01), Yamazaki
patent: 6777248 (2004-08-01), Nabatame et al.
patent: 2077253 (1981-06-01), None
patent: 2149121 (1993-10-01), None

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