Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2006-10-27
2008-10-21
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S207000
Reexamination Certificate
active
07439828
ABSTRACT:
Dielectrics fixed on holders respectively provided at semi-coaxial cavity resonator stages are movably inserted through an outer conductor. The holders projecting out of the outer conductor are coupled to a coupling member, and the coupling member is directed to slide or turn, so that distances between the dielectrics and the inner conductors of the resonators are varied, and accordingly frequencies of the resonators are varied at the same time. Accordingly, there is provided a tunable filter that avoids an increase in insertion loss, is high-power resistant, does not cause intermodulation, and allows a center frequency of the filter to be varied steplessly and quickly.
REFERENCES:
patent: 4620168 (1986-10-01), Delestre et al.
patent: 5191304 (1993-03-01), Jachowski
patent: 5233319 (1993-08-01), Mizan et al.
patent: 6861928 (2005-03-01), Okazaki et al.
patent: 7236069 (2007-06-01), Puoskari
patent: 6-061706 (1994-03-01), None
patent: 2001-102809 (2001-04-01), None
patent: 2002-141705 (2002-05-01), None
patent: WO 2004084340 (2004-09-01), None
Written Opinion, Japanese International Search Report issued Feb. 28, 2006.
Ham Seungsook
Murata Manufacturing Co. Ltd.
Ostrolenk Faber Gerb & Soffen, LLP
LandOfFree
Tunable filter, duplexer and communication apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tunable filter, duplexer and communication apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tunable filter, duplexer and communication apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4011602