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Abstract
The problem of a plane wave impinging on a semi-infinite parallel-plate waveguide is investigated. It is demonstrated that, for waveguide separation large compared to the wavelength, the fields inside the waveguide obey a simple ray optics description. The beam behavior persists for more than 1000 \lambda into a 50 \lambda waveguide. For a small 3 \lambda waveguide, the beam picture begins to blur approximately 5 \lambda into the guide.
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