原创 功率单位mw和dBm的换算表

        对于无线工程师来说更常用分贝dBm这个单位，dBm单位表示相对于1毫瓦的分贝数，dBm和W之间的关系是：dBm=10*lg(mW)1w的功率，换算成dBm就是10×lg1000＝30dBm。2w是33dBm，4W是36dBm……大家发现了吗？瓦数增加一倍，dBm就增加3。为什么要用dBm做单位？原因大致有几个：1、对于无线信号的衰减来说，不是线性的，而是成对数关系衰减的。用分贝更能体现这种关系。2、用分贝做单位比用瓦做单位更容易描述，往往在发射机出来的功率几十上百瓦，到了接收端已经是以微微瓦来计算了。3、计算方便，衰减的计算公式用分贝来计算只用做加减法就可以了。
        以1mW 为基准的dB算法，即0dBm=1mW，dBm=10*log(Power/1mW)。
        发射功率dBm－路径损失dB＝接收信号强度dBm
        最小通信功率dBm－路径损失dB≥接收灵敏度下限dBm
        最小通信功率dBm≥路径损失dB＋接收灵敏度下限dBm

功率单位mw和dbm的换算表
dBm                                  mW
0                                 1.0 mW
1                                 1.3 mW
2                                 1.6 mW
3                                 2.0 mW
4                                 2.5 mW
5                                 3.2 mW
6                                 4.0 mW
7                                 5.0 mW
8                                 6.0 mW
9                                 8.0 mW
10                                10 mW
11                                13 mW
12                                16 mW
13                                20 mW
14                                25 mW
15                                32 mW
16                                40 mW
17                                50 mW
18                                64 mW
19                                80 mW
20                              100 mW
21                              128 mW
22                              160 mW
23                              200 mW
24                              250 mW
25                              320 mW
26                              400 mW
27                              500mW
28                              640mW
29                              800mW
30                              1.0W
31                              1.3W
32                              1.6W
33                              2.0W
34                              2.5W
35                              3.0W
36                              4.0W
37                              5.0W
38                              6.0W
39                              8.0W
40                              10W
41                              13W
42                              16W
43                              20W
44                              25W
45                              32W
46                              40W
47                              50W
48                              64W
49                              80W
50                              100W
60                              1000W

注：本文出处不详。