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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 than1000 a50 . For a small3 , the beam picture begins to blur approximately5 the guide.
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Ling et al. (1987) studied this question.
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