Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1998-05-15
1999-11-09
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310352, H03H 958, H03H 960
Patent
active
059822546
ABSTRACT:
A highly reliable ladder filter has a simple structure and is adapted to be readily assembled automatically for less cost. The ladder filter includes a case including storage sections which are adjacent to each other. A first series piezoelectric resonator, a second series piezoelectric resonator and a second parallel piezoelectric resonator are stored in one storage section such that the second series piezoelectric resonator is located between the first series resonator and the parallel resonator. A first parallel piezoelectric resonator, a third parallel piezoelectric resonator and a third series piezoelectric resonator are stored in the other storage section such that the third parallel piezoelectric resonator is located between the first parallel resonator and the third series resonator. The first series piezoelectric resonator is disposed adjacent to the first parallel piezoelectric resonator such that the partition wall is located therebetween.
REFERENCES:
patent: 5260675 (1993-11-01), Ogawa et al.
patent: 5525944 (1996-06-01), Oyama
patent: 5543763 (1996-08-01), Oyama
patent: 5705880 (1998-01-01), Shimura et al.
Murata Manufacturing Co. Ltd.
Pascal Robert
Summons Barbara
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