Resonator, band-pass filter, and duplexer

Details Resonator, band-pass filter, and duplexer Resonator, band-pass filter, and duplexer

2006-12-29

2008-12-02

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S219200, C333S132000, C333S235000, C333S188000

Reexamination Certificate

active

07459993

ABSTRACT:
A resonator, a band-pass filter, and a duplexer are provided. In the resonator, a first electrode is formed of a nonmagnetic conductive material. A ferromagnetic fixed layer is disposed on the first electrode and has a magnetization direction which is fixed. A nonmagnetic conductive layer is disposed on the ferromagnetic fixed layer. A ferromagnetic free layer is disposed on the nonmagnetic conductive layer and has a magnetization direction which varies depending on an external magnetic field. A second electrode is disposed on the ferromagnetic free layer and comprises a nonmagnetic conductive material. The band-pass filter and the duplexer are configured using the resonator. The band-pass filter and the duplexer can operate in a high-frequency range and be miniaturized. The bandwidth of the band-pass filter and the duplexer can be adjusted and the band-pass filter and the duplexer can be formed in one body with an integrated circuit.

REFERENCES:
patent: 6104275 (2000-08-01), Maeda
patent: 6348846 (2002-02-01), von Gutfeld et al.
patent: 6498549 (2002-12-01), Jiang et al.
patent: 6501971 (2002-12-01), Wolf et al.
patent: 7307818 (2007-12-01), Park et al.
patent: 2002/0038989 (2002-04-01), Larson
patent: 2005/0023938 (2005-02-01), Sato et al.
patent: 2007/0242395 (2007-10-01), Bailey

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