submultiple of the wavelength of a periodic electromagnetic or
electrical signal propagating within the medium.
2. Of a transmission medium, its physical length multiplied by the
ratio of (a) the propagation time of an electrical or electromagnetic
signal through the medium to (b) the propagation time of an
electromagnetic wave in free space over a distance equal to the
physical length of the medium in question. Note: The electrical length
of a physical medium will always be greater than its physical length.
For example, in coaxial CABLES, distributed resistances,
capacitances and inductances impede the propagation of the signal.
In an OPTICAL fiber, interaction of the lightwave with the materials of
which the fiber is made, and fiber geometry, affect the velocity of
propagation of the signal.
3.Of an antenna, the effective length of an element, usually
expressed in wavelengths.
Note 1: The electrical length is in general different from the physical
length.
Note 2:By the addition of an appropriate reactive element (capacitive
or inductive), the electrical length may be made significantly shorter
or longer than the physical length.
电长度：1.对于传输媒介，它的长度被表示为一个在媒介中传波的电
或者电磁信号波长的倍数。
注释 1：波长可能用弧度来表示，或者其它的角度单位来表示，如角
度。
注释 2：在同轴电缆和光纤中，传输速率大约为自由空间中的 2/3。因
此，波长
大约为自由空间中波长的 2/3，而电长度则大约为物理长度的 1.5
倍。
2.对于传输媒介，（电长度）用 它的物理长乘以 电或电磁信号在媒介
中的传输
时间（时间为 a）与 这信号在自由空间中通过跟媒介物理长度一样的
距离时所
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