| 摘要 |
A filter device substrate 1 of the present invention is formed by stacking a plurality of ceramic layers 12, 14 , and includes a filter chip mounting portion for mounting a transmission filter chip 2 and a reception filter chip 3 . Arranged on a surface of one ceramic layer 12 are a signal input pad 73 , a signal output pad 7 , a signal input side ground pattern 44 and a signal output side ground pattern 43 for connecting a signal input terminal C, a signal output terminal D, a signal input side ground terminal G and a signal output side ground terminal G, respectively, of the reception filter chip 3 . The signal input side ground pattern 44 and the signal output side ground pattern 43 are connected to each other by a connection wiring pattern 45 on the surface of the one ceramic layer 12.
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