SAW filter with an improved attenuation characteristic at a...

Wave transmission lines and networks – Coupling networks – Electromechanical filter

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C333S194000, C333S195000, C310S31300R

Reexamination Certificate

active

06844795

ABSTRACT:
A SAW (Surface Acoustic Wave) filter includes serial arm resonators and parallel arm resonators interconnected in pairs in a multiple-stage, ladder configuration. A resonating device is serially connected to any one of the serial arm resonators and has an attenuation pole frequency higher than that of the serial arm resonator. At the attenuation pole frequency of the serial arm resonator, the resonating device functions as capacitance without performing attenuation. The resonating device has an antiresonance frequency 1.8 times or more but 2.2 times or less, or 2.7 times or more but 3.3 times or less, as high as the antiresonance frequency of the serial arm resonator.

REFERENCES:
patent: 4295108 (1981-10-01), Ieki
patent: 6166611 (2000-12-01), Seki et al.
patent: 6377140 (2002-04-01), Ehara et al.
patent: 6424238 (2002-07-01), Penunuri
patent: 9-61783 (1994-03-01), None
patent: 9-135145 (1997-05-01), None
Yoshio Satoh, et al, “A Low-Loss Band-Pass Filter Using SAW Resonators”, Transactions of the Institute of Electronics, Information and Communication Engineers of Japan, vol. J76-A, No. 2, pp. 245-252 (1993).
Mitsutaka Hikita, et al, “Experiments of High-Performance SAW Filters for Mobile Radio Transceivers”, Transactions of the Institute of Electronics, Information and Communication Engineers of Japan, vol. J76-A, No. 2, pp. 236-244 (1993).
Yuji Suzuki, et al, “Coupled-Mode Theory of SAW Periodic Structures”, Transactions of the Institute of Electronics, Information and Communication Engineers of Japan, vol. J76-A, No. 2, pp. 87-95 (1993).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

SAW filter with an improved attenuation characteristic at a... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with SAW filter with an improved attenuation characteristic at a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SAW filter with an improved attenuation characteristic at a... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3369429

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.