Saw filter chip mounted on a substrate with shielded conductors

Details Saw filter chip mounted on a substrate with shielded conductors Saw filter chip mounted on a substrate with shielded conductors

1989-10-30

1992-11-10

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313R, 310348, H03H 905, H03H 925

Patent

active

051628228

ABSTRACT:
A surface acoustic wave filter device having a surface acoustic wave filter chip disposed on the upper surface of a substrate, input and output conductor patterns provided on each of the upper and lower surfaces of the substrate, and grounding conductor patterns provided on each of the upper and lower surfaces of the substrate so as to surround the input and output conductor patterns on that surface in order to prevent an electromagnetic coupling between the input and output conductor patterns, whereby the out-of-band rejection of at least 40 dB is obtained in an operating band of at least 400 MHz.

REFERENCES:
patent: 3885173 (1975-05-01), Lee
patent: 4250473 (1981-02-01), Gemba
patent: 4423395 (1983-12-01), Shirahama
patent: 4751482 (1988-06-01), Fukuta et al.
patent: 4772862 (1988-09-01), Kubo et al.
patent: 4845397 (1989-07-01), Herrick et al.
Electronic Packaging Technology, 1989, 2(vol. 5, No. 2), pp. 78-81.

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