Filter circuit

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C333S202000, C333S185000, C333S219000

Reexamination Certificate

active

06975186

ABSTRACT:
This invention is a filter circuit provided in a radio communication module. First to third conductor patterns (8to10) having a length shorter than λ/4 of a passing wavelength λ and electromagnetically coupled with each other are formed as distributed line patterns parallel to each other in a dielectric board (2), and a first capacitor (16) and a second capacitor (17) add parallel capacitance to the first conductor pattern (8) and the second conductor pattern (9) having their distal ends short-circuited. The third conductor pattern (10) has its both end opened. As the first conductor pattern (8) and the second conductor pattern (9) carry out inductive operation and the third conductor pattern (10) is capacitive-coupled with these conductor patterns, resonance is made in a band lower than a frequency band prescribed by the length of the lines.

REFERENCES:
patent: 3621367 (1971-11-01), Rosen et al.
patent: 3745489 (1973-07-01), Cristal et al.
patent: 3982214 (1976-09-01), Burns
patent: 4157517 (1979-06-01), Kneisel et al.
patent: 5066933 (1991-11-01), Komeda
patent: 5608364 (1997-03-01), Hirai et al.
patent: 5880652 (1999-03-01), Snel
patent: 5963115 (1999-10-01), Holleboom et al.
patent: 6130189 (2000-10-01), Matthaei
patent: 6483404 (2002-11-01), Ammar et al.
patent: 6597265 (2003-07-01), Liang et al.
patent: 6603372 (2003-08-01), Ishizaki et al.
patent: 6784766 (2004-08-01), Allison et al.
patent: 63-182901 (1988-07-01), None
patent: 7-221580 (1995-08-01), None
patent: 8-330805 (1996-12-01), None
patent: 11-284471 (1999-10-01), None

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

Filter circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

     

Profile ID: LFUS-PAI-O-3498349

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