Patent ID: 7436273
Filing Date: 2008-10-14
Classification: H01L,H03H,Y10T

Abstract:
1. A SAW broadband filter device comprising: a SAW chip including a plurality of SAW filters with different central frequencies formed on one piezoelectric substrate, ones of input and output terminals of said plurality of SAW filters being constituted as balanced signal terminals and the others thereof being constituted of unbalanced signal terminals; a mounting board on which said SAW chip is mounted on connection electrodes via conductive bumps in a flip chip manner; and a resin layer which is formed so as to cover the mounting board and a surface of the SAW chip, wherein respective grounds of said plurality of SAW filters are connected together to be connected to one grounding pattern of said mounting board; and at least one wiring pattern of one SAW filter of said plurality of SAW filters connected to said one grounding pattern on a mounting face of said mounting board and at least one wiring pattern of another SAW filter of said plurality of SAW filters connected to said one grounding pattern on the mounting face of the mounting board are connected to each other on said SAW chip; and wherein said one grounding pattern is provided on said mounting face of said mounting board so as to be at least between one connection electrode connected to an input or an output terminal of said one SAW filter of said plurality of SAW filters and another connection electrode connected to an input or an output terminal of said another SAW filter of said plurality of SAW filters; said one connection electrode and said another connection electrodes are electrically separated; and of said conductive bumps, all of such conductive bumps that are connected to ground terminals are provided on said one grounding pattern.