| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna duplexer obtaining a high isolation effect. SOLUTION: This antenna duplexer 8 is configured in such a way that a transmission filter 51 and a reception filter 41 are mounted on the surface of a package 83 formed by stacking a plurality of ceramic layers 81, and a phase matching strip line 7 is formed on the surface of one ceramic layer 81. Also, in the package 83, ground layers 61, 71 are formed on the surfaces of the top and bottom ceramic layers 81, 81 with the line 7 sandwiched, and a plurality of via holes 4 for coupling both the ground layers 61, 71 are formed around the line 7. COPYRIGHT: (C)2005,JPO&NCIPI
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