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Rays versus modes: pictorial display of energy flow in an open-ended waveguide

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3 Author(s)
Hao Ling ; Texas Univ., Austin, TX, USA ; Chou, R.-C. ; Shung-Wu Lee

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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Antennas and Propagation, IEEE Transactions on  (Volume:35 ,  Issue: 5 )