Motorola Corporation

Douglas A Morris

Frederick Y Cho

Raymond L Sokola

Truc G Hoang

Charles W Shanley

Steven E Grieco

Daniel H Balinski

A method for bonding a first ceramic element and a second ceramic element utilizes a silver powder paste composed of silver particles dispersed in a volatile vehicle. A film of the paste is applied and dried onto a faying surface of each element. The elements are assembled with the films in contact and heated to sinter the silver particles into an integral silver layer that is bonded to the faying surfaces, thereby bonding the elements together. The method is particularly well suited to manufacturing a stripline filter, wherein the sintered layer not only bonds the ceramic elements, but also forms a metallic feature, such as a resonator, of the filter.

Silver paste sintering method for bonding ceramic surfaces

Surface acoustic wave devices (160) as well as other electronic devices, can be mounted into the sides of ceramic blocks (150) that comprise a ceramic block filter device. The surface acoustic wave device as mounted in the filter block does not require or displace volume that would be required to mount the surface acoustic wave devices in their own housings.

Combined acoustic wave device and ceramic block filter structure

A ceramic block filter (114,118) employs a novel tuning process which avoids the necessity of etching or abrading plating on the top surface of the block. Initially, the blocks (210) are prepared from a batch of ceramic material such that their height is intentionally longer than desired, so that the filter center frequency is slightly lower than desired. Next, an artwork mask (310) designed in accordance with pre-selected frequency related characteristics and desired performance specifications is used for applying an electrically conductive material (240) to the top surface of the block (210). Then, the center frequency and resonator length of the block (210) are measured and a new resonator length is calculated using the measured values. The bottom surface of the block (210) is next lapped to the new resonator length. Then, electrically conductive material is applied to the lapped bottom surface of the block (210).

Growing community of inventors

Albuquerque, NM, United States of America

Douglas A Morris