2005/11/03 | 波导[Waveguides]
类别(Ω〖物理〗) | 评论(0) | 阅读(31) | 发表于 21:41
Transverse electromagnetic (TEM) modes have . they cannot propagate through a single conductor. TEM modes are dispersionless, with z-component of wavenumber given by

where is the angular frequency and c is the speed of light.
ransverse electric (TE) modes have and . TE modes transmit frequencies larger than a characteristic cutoff frequency with dispersion. For a rectangular waveguide,
(1)

(2)

(3)

Transverse magnetic (TM) modes have , . TM modes transmit frequencies larger than a characteristic cutoff frequency with dispersion. For a rectangular waveguide,
(4)

(5)

(6)

For TE and TM modes, the following quantities are defined
(7)

(8)

(9)

where
(10)

(11)

The cutoff frequency is
(12)

The phase velocity is

(13)
0

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