| 摘要 |
A dielectric plate, serving as a 90-degree phase device, is disposed inside a waveguide. A phase-converting portion of uniform thickness is formed at the central portion of the dielectric plate, and stepped portions, serving as impedance converting portions, are formed at both longitudinal end portions of the phase converting portion by causing protrusions to be protrude from both of the longitudinal end portions. The protrusions are disposed on orthogonal axes extending in widthwise and thickness directions of the dielectric plate. The protruding amount of each of the protrusions from end surfaces of the phase converting portion is approximately ¼ of a wavelength lambdg inside the waveguide. The end surfaces of the phase converting portion and corresponding end surfaces of the protrusions form reflecting surfaces that are orthogonal to the direction of propagation of an electrical wave.
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