Electric filter, and duplexer using the same

Details Electric filter, and duplexer using the same Electric filter, and duplexer using the same

2007-02-27

2007-02-27

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000

Reexamination Certificate

active

10995365

ABSTRACT:
An electric filter according to an embodiment of the present invention is an electric filter having a piezoelectric resonator10to obtain a signal of a predetermined resonance frequency from a bulk wave propagating inside a piezoelectric film15.This electric filter is configured to satisfy k2>(BP/0.6f), where k2is the square of an effective electromechanical coupling coefficient of the piezoelectric resonator10,BP a pass bandwidth of the electric filter, and f a center frequency of a target pass band of the electric filter.

REFERENCES:
patent: 6472954 (2002-10-01), Ruby et al.
patent: 6870445 (2005-03-01), Kawakubo et al.
patent: 6927649 (2005-08-01), Metzger et al.
patent: 6936837 (2005-08-01), Yamada et al.
patent: 6954121 (2005-10-01), Bradley et al.
patent: 2005/0073375 (2005-04-01), Sul et al.
patent: A 2001-244704 (2001-09-01), None
Lakin K.M. et al., “Improved Bulk Wave Resonator Coupling Coefficient For Wide Bandwidth Filters”; IEEE 2001 Ultrasonics Symposium; vol. 1, pp. 827-832, Oct. 7-10, 2001.
Lakin et al., “Thin Film Bulk Acoustic Wave Filters for GPS,” Ultrasonics Symposium, pp. 471-476, 1992.
Larson et al., “A BAW Antenna Duplexer for the 1900 MHz PCS Band,” IEEE Ultrasonics Symposium, pp. 887-890, 1999.
Ruby et al., “Micromachined Thin Film Bulk Acoustic Resonators,” IEEE International Frequency Control Symposium, pp. 135-138, 1994.

Affiliated with

Also associated with

Rating

Electric filter, and duplexer using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electric filter, and duplexer using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric filter, and duplexer using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3822127