作者iyenn (晓风)
看板Physics
标题[题目] 共振腔Q101 Qmax a=d怎推来的@_@
时间Sun Nov 15 01:49:52 2009
[领域]电磁学
[来源]Dk cheng
[题目]P10.41
A rectangular cavity resonator of length d is constructed
from an axb rectangular waveguide.It is to be operated at
the TE101 mode
a)For a fixed b, determine the relative magnitudes of a
and d s.t. the Q max
[瓶颈]解答说it will be max when a=d
which give a max. volume-to-surface ratio. <--这不懂
a=d时为啥体积/表面积 会最大= =?
虽然我从Q=wU/P_L 可以理解U 跟体积有关
P_L跟表面积有关
但为什麽a=d时volume-to-surface ratio 会max ,卡这边>"<
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