Balanced-type surface acoustic wave lattice filter

Details Balanced-type surface acoustic wave lattice filter Balanced-type surface acoustic wave lattice filter

1996-05-29

1998-12-08

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313R, H03H 964, H03H 952

Patent

active

058476261

ABSTRACT:
A balanced-type surface acoustic wave filter is provided which can attain a balanced-type of high frequency circuit without connecting a balance-unbalanced conversion circuit.
A substrate of tantalic acid lithium substrate with 36 degrees rotation, Y cut, and X propagation is used, and aluminium is used for electrode to form resonators. Then, two resonators in a serial arm and two resonators in a parallel arm are connected in the form of symmetry and lattice to form a balanced-type surface acoustic wave filter. In this configuration, antiresonance frequency in the serial arms and resonance frequency in the parallel arms are substantially equal to each other.

REFERENCES:
patent: 2696591 (1954-12-01), Leroy
patent: 4785270 (1988-11-01), Kinsman
patent: 5028893 (1991-07-01), Fliegel
patent: 5093638 (1992-03-01), Kinsman et al.
patent: 5508667 (1996-04-01), Kondratiev et al.
1974 Ultrasonics Symposium Proceedings; New York, US: S.C. Tseng et al: SAW Planar Network.

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