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Published bySage Newman Modified about 1 year ago

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EMLAB 1 Waveguides

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EMLAB 2 Waves in cylinder In a waveguide whose cross-section is uniform along z-axis, variation of E, H is proportional to exp(-j z). In a waveguide, transverse E and H can be obtained from E z and H z.

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EMLAB 3 TM, TE mode TM mode : Electromagnetic wave modes with H z =0 are called TM modes (Transverse Magnetic). Those modes can be found from E z. TE mode : Electromagnetic wave modes with E z =0 are called TE modes (Transverse Electric). Those modes can be found from H z.

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EMLAB 4 Eigen-function expansions in waveguides TM modes TE modes TEM modes

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EMLAB 5 Rectangular waveguide (TE mode) Boundary condition

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EMLAB 6 Field lines for some of the lower order modes of a rectangular waveguide. Reprinted from Fields and Waves in Communication Electronics, Ramo et al, © Wiley, 1965)

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EMLAB 7

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8 WR-90 X-band 8.2GHz~12.4GHz (2.286cm × 1.016cm) Example : WR-90 5GHz input signal Attenuation by a 3cm-long evanescent waveguide

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EMLAB 9 Cavity resonator Minimum frequency

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EMLAB 10 Cylindrical waveguide By separation of variables

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EMLAB 11 Cylindrical waveguide mode

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EMLAB 12 Cutoff frequencies of the first few TE and TM modes of a circular waveguide, relative to the cutoff frequency of the dominant TE 11 mode.

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