| 摘要 |
The present invention provides a waveguide coupler capable of attaining high electrical characteristics and high productivity. The waveguide coupler 10 of the present invention includes four ports 1 to 4, and grooves 21 to 24 provided along a waveguide wall in the vicinity of a joint. The grooves 21 and 22 are formed along inner walls and the grooves 23 and 24 are formed along outer walls. By forming grooves along the waveguide wall, the same function as a case where a ridge exists in the vicinity of the joint can be served and therefore bandwidth of various frequency characteristics can be widened, thus attaining high electrical characteristics in various frequency menus. Further, cutting grooves provides higher manufacturing workability than forming a ridge and increase the way of grooving, thereby attaining high cost performance and high productivity.
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