Patent ID: 6105226
Filing Date: 2000-08-22
Classification: H01L,H03H,Y10T

Abstract:
A method for suppressing crosstalk between inputs and outputs of a SAW device surface mounted for operation with a printed circuit board, the method comprising the steps of:laminating a first ceramic layer to a second ceramic layer wherein the first ceramic layer comprises a metalized top surface, a bottom surface and an aperture formed within a center portion of the first layer for receiving a SAW device therein, the first layer aperture forming a first layer inside wall, the first layer further having a protrusion extending into the aperture from an inside wall portion, and wherein the second ceramic layer comprises top and bottom surfaces and an aperture formed within a center portion of the second layer for receiving the SAW device therein, the second layer aperture forming a second layer inside wall, the second layer top surface having metalized surface portions for providing internal input, output and ground connections from the carrier second layer to SAW device input, output and grounds connections respectively, the second layer top surface attached to the first layer bottom surface wherein the second layer metalized surface portions are accessible for making wire bond connections thereto, the ground connections and protrusion positioned between the input and output connections;forming a cavity for receiving the SAW package by laminating a third ceramic layer to the second layer, the third layer comprising a metalized top surface and a bottom surface, the third ceramic layer top surface receiving the second layer bottom surface for forming the cavity, the cavity having inside walls formed from the first and second layer inside walls and a bottom wall formed from the third layer top surface, the third layer bottom surface having metalized surface portions for providing external input, output and ground connections from the carrier to input, output and ground connections on a printed circuit board, the ground connections positioned between the input and output connections; andelectrically connecting the first layer metalized top surface through the protrusion and the internal ground connection to the external ground connection, the electrical connecting having a path positioned between respective input and output connections for providing an electromagnetic shield therebetween.