Monolithic crystal filter device

Details Monolithic crystal filter device Monolithic crystal filter device

1977-12-15

1979-08-07

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310366, H03H 902, H03H 926, H03H 932, H01L 4104

Patent

active

041639596

ABSTRACT:
An improved monolithic crystal filter arrangement is disclosed wherein a monolithic crystal filter device is formed on a wafer of quartz crystal, or other piezoelectric material, with two pairs of electrodes thereon, each pair cooperating with the wafer to form a resonating portion. Each pair of electrodes include an active electrode, i.e., input or output, and a ground electrode. The input and output electrodes are formed end-wise on alternate sides of the crystal wafer with the ground electrodes, likewise on alternate wafer sides, positioned along an axis perpendicular to that of the active electrodes and in a location so that at least a portion of each thereof extend into the gap between the in-board ends of the active electrodes.

REFERENCES:
patent: 2248776 (1941-07-01), Och
patent: 2323610 (1943-07-01), Koch
patent: 4006437 (1977-02-01), Simpson et al.

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