WAVEGUIDE ELEMENT, WAVEGUIDE BRANCH OR COUPLER ELEMENT AND WAVEGUIDE INTEGRATED CIRCUIT

摘要

A waveguide element is capable of realizing acutewaveguide discontinuity, such as a right angle bending,(L-shaped bending) or branching (T-shaped branching). Twosingle mode waveguides having the identical cross-sectionalstructure form a waveguide discontinuity where center axesthereof extending in the longitudinal direction intersect witheach other at an angle .theta. (0.theta. ~ 90°). A leaky wave propagationregion in a form of a lozenge shape having a length of one edgeof L is located in the vicinity of a point where the centeraxes extended in the longitudinal directions of respectiveincident side and side single mode waveguides, with aneffective propagation wavelength of a dominant mode there ofto be cos (.theta./2) times of an effective propagation wavelength.lambda.G. Thus, an energy of the wave launched from an incident endof the single mode waveguide can be efficiently taken out froma end of the single mode waveguide.