作者ytc01286 (心如饮水冷暖自知)
看板Physics
标题[题目] 电磁波
时间Tue Oct 28 21:38:08 2008
[领域] 电磁干扰 (题目相关领域)
[来源] 电磁相容课本 (课本习题、考古题、参考书...)
(1).
Determine the following electric field intensity levels in dBmV=m:
1. 100μV/m [40 dBμV/m]
2. 1 mV/m [60 dBμV/m]
3. 200 V/m [166 dBμV/m]
(2).
A 50Ω source is connected to a 50Ω receiver using 30 ft of RG58U
coaxial cable. If the source output is 100 MHz and –30 dBm, determine
the voltage at the receiver in mV and dBμV. [6.05mV, 75.6 dBμV]
(3).
A 50Ω receiver is attached to an antenna via 200 m of RG58U coaxial
cable. The receiver indicates a level of -20 dBm at 200 MHz. Determine
the voltage at the base of the antenna in dBμV and in V if the cable loss
at 200 MHz is 8 dB/100 ft. [139.49 dBμV, 9.43V]
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