| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission reception branching filter that restrictions caused when it is mounted on a device can be excluded by arranging the direction of a waveguide interface of all ports of an antenna port and transmission/ reception port and respective ports can be made close to each other. SOLUTION: A transmission/reception branching filter adopts a configuration such that using an E-plane T-branch 16 connects transmission reception ends 10, 11 having an H-plane T-branch structure with an antenna end 9. Thus, the antenna end 9 can use the H-plane T-branch so that the transmission/ reception ports 3, 4 and the antenna port 2 can be arranged in the same direction. Furthermore, the transmission/reception ports 3, 4 and the antenna port 2 can physically be set close to each other.
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