Nhk Spring Co., Ltd.

Bao Xue Chen

Michiya Masuda

A transition waveguide is provided between one main waveguide and two branching waveguides. The transition waveguide includes a stepped portion, of which the waveguide width suddenly slightly spreads stepwise with respect to the distal end portion of the main waveguide, and an extension portion extending from the stepped portion toward the branching waveguides. The waveguide width of the extension portion is substantially fixed or gradually increased in a region ranging from the stepped portion to the branching waveguides.

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Yokohama, Japan

Bao Xue Chen