Motorola Corporation

Corwin E Livenick

Aristotelis S Arvanitis

Stanley Malinowski

Robert W Paulsen

Clifford L Rose

William B Deutschmann

Len A Tyler

Three electrode pairs are formed on a monolithic piezoelectric element which exhibits anisotropic properties with respect to its X and Z axes. The electrodes of each pair are located on opposite sides of the piezoelectric element, with all electrodes being of predetermined dimensions. The first and second electrode pairs are aligned on the X axes at a predetermined spacing therebetween. The second and third electrode pair are aligned on the Z axis, also at a predetermined spacing. In circuit operation, a signal to be processed is coupled to the first electrode pair and extracted from the third electrode pair, with the electrodes of the second pair shorted together. In this manner, the resonator displays a three pole passband characteristic having excellent spur suppression.

Multipole resonator

A crystal mounting structure for mounting a crystal plate having a plurality of electrodes on major surfaces thereof assembled by means of a rectangular conductive lead frame having a plurality of inwardly extending mounting members and a frame of insulating material defining a central aperture formed with the mounting members embedded therein for rigid support of the crystal plate and electrical connection thereto. A number of rigid conductive mounting members extend through the insulating material and have first portions extending into the central aperture. A number of conductive mounting members hold the mounting structure to the lead frame for later testing purposes. Two of the first portions of the mounting members extending into the central cavity extend inwardly from substantially opposite directions. The crystal plate electrodes are electrically and mechanically secured to the first portions of the mounting members in the central aperture by means of a relatively plastic solder or the like. The first portions are rigid for reducing flexure of the first portions and the crystal plate. Top and bottom covers are secured to the frame, for providing a sealed enclosure, and to a mounting member for providing a grounded RF shield.

Crystal mounting structure and method of assembly

Growing community of inventors

Hickory Hills, IL, United States of America

Corwin E Livenick