| 摘要 |
A waveguide element is capable of realizing acute waveguide discontinuity, such as a right angle bending, (L-shaped bending) or branching (T-shaped branching). Two single mode waveguides having the identical cross-sectional structure form a waveguide discontinuity where center axes thereof extending in the longitudinal direction intersect with each other at an angle .theta. (0<.theta. ~ 90.degree.). A leaky wave pr opagation region in a form of a lozenge shape having a length of one edge of L is located in the vicinity of a point where the center axes extended in the longitudinal directions of respective incident side and side single mode waveguides, with an effective propagation wavelength of a dominant mode there of to be cos (.theta./2) times of an effective propagation wavelength .lambda.G. Thus, an energy of the wave launched from an incident e nd of the single mode waveguide can be efficiently taken out from a end of the single mode waveguide.
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