Balanced acoustic wave filter device and composite filter

Details Balanced acoustic wave filter device and composite filter Balanced acoustic wave filter device and composite filter

2011-03-01

2011-03-01

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S133000

Reexamination Certificate

active

07898366

ABSTRACT:
An acoustic wave filter device which attains improved balancing between transmission characteristics of first and second balanced terminals includes first and second 3-IDT longitudinally coupled resonator type acoustic wave filter elements that are connected to an unbalanced terminal in parallel, and one terminal of a first IDT and one terminal of a fourth IDT are connected to each other and further connected to the unbalanced terminal, second and third IDTs are connected to each other and further connected to a first balanced terminal, fifth and sixth IDTs are connected to each other and further connected to a second balanced terminal, and a first ground line which electrically connects the second IDT which is nearer to a first ground terminal than the third IDT to the second ground terminal is longer than a second ground line which electrically connects the fifth IDT which is nearer to the first ground terminal than the sixth IDT to the first ground terminal.

REFERENCES:
patent: 2006/0181369 (2006-08-01), Shibahara
patent: 2007/0075804 (2007-04-01), Otsuka
patent: 2007/0103254 (2007-05-01), Haruta et al.
patent: 2009/0261921 (2009-10-01), Moriya et al.
patent: 1 763 133 (2007-03-01), None
patent: 2006-246145 (2006-09-01), None
patent: 2007-104052 (2007-04-01), None
patent: 2006/003787 (2006-01-01), None
Official Communication issued in International Patent Application No. PCT/JP2008/055260, mailed on May 13, 2008.

Affiliated with

Also associated with

Rating

Balanced acoustic wave filter device and composite filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Balanced acoustic wave filter device and composite filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Balanced acoustic wave filter device and composite filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2671106