dBm与功率(w)换算关系！ |
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dBm是一个表示功率绝对值的值（也可以认为是以1mW功率为基准的一个比值）， 计算公式为：dBm=10log（功率值/1mw） wW=power(10,dBm/10) W=(power(10,dBm/10))/1000
一、粗略计算方法 这里将dBm转换为W的口算规律是要先记住“1个基准”和“2个原则”： “1个基准”：30dBm＝1W “2个原则”：1)＋3dBm，功率乘2倍；－3dBm，功率乘1/2| 举例：33dBm＝30dBm+3dBm＝1W×2=2W 27dBm＝30dBm－3dBm＝1W×1/2=0.5W 2)＋10dBm，功率乘10倍；－10dBm，功率乘1/10 举例：40dBm＝30dBm+10dBm＝1W×10=10W 20dBm＝30dBm－10dBm＝1W×0.1=0.1W 以上可以简单的记作：30是基准，等于1W整，互换不算难，口算可完成。加3乘以2，加10乘以10；减3除以2，减10除以10。 几乎所有整数的dBm都可用以上的“1个基准”和“2个原则”转换为W。 例1：44dBm=?W 44dBm=30dBm+10dBm+10dBm－3dBm－3dBm =1W×10×10×1/2×1/2 =25W 例2：32dBm=? 32dBm=30dBm+3dBm+3dBm+3dBm+3dBm-10dBm =1W×2×2×2×2×0.1 =1.6W 计算技巧：+1dBm和+2dBm的计算技巧 +1dBm=+10dBm－3dBm－3dBm－3dBm =X×10×1/2×1/2×1/2 =X×1.25 +2dBm=－10dBm+3dBm+3dBm+3dBm+3dBmw =X×0.1×2×2×2×2 =X×1.6 一般来讲，在工程中，dBm和dBm（或dBw和dBw）之间只有加减，没有乘除。而用得最多的是减法：dBm减 dBm 实际上是两个功率相除，信号功率和噪声功率相除就是信噪比（SNR）。dBm加dBm 实际上是两个功率相乘。
一、精确计算方法 计算公式为：dBm=10log（功率值/1mw） wW=power(10,dBm/10) W=(power(10,dBm/10))/1000 功率-》dBm的换算 dBmmw dBmmw dBmW dBmW -100 0.0000000001000000 -50 0.0000100000000000 0 0.001 50 100.000 -990.0000000001258925 -490.0000125892541179 10.001 51125.893 -98 0.0000000001584893 -48 0.0000158489319246 2 0.002 52 158.489 -970.0000000001995262 -470.0000199526231497 30.002 53199.526 -96 0.0000000002511886 -46 0.0000251188643151 4 0.003 54 251.189 -950.0000000003162278 -450.0000316227766017 50.003 55316.228 -94 0.0000000003981072 -44 0.0000398107170553 6 0.004 56 398.107 -930.0000000005011872 -430.0000501187233627 70.005 57501.187 -92 0.0000000006309573 -42 0.0000630957344480 8 0.006 58 630.957 -910.0000000007943282 -410.0000794328234724 90.008 59794.328 -90 0.0000000010000000 -40 0.0001000000000000 10 0.010 60 1000.000 -890.0000000012589254 -390.0001258925411794 110.013 611258.925 -88 0.0000000015848932 -38 0.0001584893192461 12 0.016 62 1584.893 -870.0000000019952623 -370.0001995262314969 130.020 631995.262 -86 0.0000000025118864 -36 0.0002511886431510 14 0.025 64 2511.886 -850.0000000031622777 -350.0003162277660168 150.032 653162.278 -84 0.0000000039810717 -34 0.0003981071705535 16 0.040 66 3981.072 -830.0000000050118723 -330.0005011872336273 170.050 675011.872 -82 0.0000000063095734 -32 0.0006309573444802 18 0.063 68 6309.573 -810.0000000079432823 -310.0007943282347243 190.079 697943.282 -80 0.0000000100000000 -30 0.0010000000000000 20 0.100 70 10000.000 -790.0000000125892541 -290.0012589254117942 210.126 7112589.254 -78 0.0000000158489319 -28 0.0015848931924611 22 0.158 72 15848.932 -770.0000000199526231 -270.0019952623149689 230.200 7319952.623 -76 0.0000000251188643 -26 0.0025118864315096 24 0.251 74 25118.864 -750.0000000316227766 -250.0031622776601684 250.316 7531622.777 -74 0.0000000398107171 -24 0.0039810717055350 26 0.398 76 39810.717 -730.0000000501187234 -230.0050118723362727 270.501 7750118.723 -72 0.0000000630957344 -22 0.0063095734448019 28 0.631 78 63095.734 -710.0000000794328235 -210.0079432823472428 290.794 7979432.823 -70 0.0000001000000000 -20 0.0100000000000000 30 1.000 80 100000.000 -690.0000001258925412 -190.0125892541179417 311.259 81125892.541 -68 0.0000001584893192 -18 0.0158489319246111 32 1.585 82 158489.319 -670.0000001995262315 -170.0199526231496888 331.995 83199526.231 -66 0.0000002511886432 -16 0.0251188643150958 34 2.512 84 251188.643 -650.0000003162277660 -150.0316227766016838 353.162 85316227.766 -64 0.0000003981071706 -14 0.0398107170553497 36 3.981 86 398107.171 -630.0000005011872336 -130.0501187233627272 375.012 87501187.234 -62 0.0000006309573445 -12 0.0630957344480193 38 6.310 88 630957.344 -610.0000007943282347 -110.0794328234724281 397.943 89794328.235 -60 0.0000010000000000 -10 0.1000000000000000 40 10.000 90 1000000.000 -590.0000012589254118 -90.1258925411794170 4112.589 911258925.412 -58 0.0000015848931925 -8 0.1584893192461110 42 15.849 92 1584893.192 -570.0000019952623150 -70.1995262314968880 4319.953 931995262.315 -56 0.0000025118864315 -6 0.2511886431509580 44 25.119 94 2511886.432 -550.0000031622776602 -50.3162277660168380 4531.623 953162277.660 -54 0.0000039810717055 -4 0.3981071705534970 46 39.811 96 3981071.706 -530.0000050118723363 -30.5011872336272720 4750.119 975011872.336 -52 0.0000063095734448 -2 0.6309573444801930 48 63.096 98 6309573.445 -510.0000079432823472 -10.7943282347242810 4979.433 997943282.347 dBm->功率的换算 mw dBm mw dBm W dBm W dBm 1 0.00 51 17.08 0.1 20.00 42 46.23 2 3.01 52 17.16 0.2 23.01 43 46.33 3 4.77 53 17.24 0.3 24.77 44 46.43 4 6.02 54 17.32 0.4 26.02 45 46.53 5 6.99 55 17.40 0.5 26.99 46 46.63 6 7.78 56 17.48 0.6 27.78 47 46.72 7 8.45 57 17.56 0.7 28.45 48 46.81 8 9.03 58 17.63 0.8 29.03 49 46.90 9 9.54 59 17.71 0.9 29.54 50 46.99 10 10.00 60 17.78 1 30.00 51 47.08 11 10.41 61 17.85 2 33.01 52 47.16 12 10.79 62 17.92 3 34.77 53 47.24 13 11.14 63 17.99 4 36.02 54 47.32 14 11.46 64 18.06 5 36.99 55 47.40 15 11.76 65 18.13 6 37.78 56 47.48 16 12.04 66 18.20 7 38.45 57 47.56 17 12.30 67 18.26 8 39.03 58 47.63 18 12.55 68 18.33 9 39.54 59 47.71 19 12.79 69 18.39 10 40.00 60 47.78 20 13.01 70 18.45 11 40.41 61 47.85 21 13.22 71 18.51 12 40.79 62 47.92 22 13.42 72 18.57 13 41.14 63 47.99 23 13.62 73 18.63 14 41.46 64 48.06 24 13.80 74 18.69 15 41.76 65 48.13 25 13.98 75 18.75 16 42.04 66 48.20 26 14.15 76 18.81 17 42.30 67 48.26 27 14.31 77 18.86 18 42.55 68 48.33 28 14.47 78 18.92 19 42.79 69 48.39 29 14.62 79 18.98 20 43.01 70 48.45 30 14.77 80 19.03 21 43.22 71 48.51 31 14.91 81 19.08 22 43.42 72 48.57 32 15.05 82 19.14 23 43.62 73 48.63 33 15.19 83 19.19 24 43.80 74 48.69 34 15.31 84 19.24 25 43.98 75 48.75 35 15.44 85 19.29 26 44.15 76 48.81 36 15.56 86 19.34 27 44.31 77 48.86 37 15.68 87 19.40 28 44.47 78 48.92 38 15.80 88 19.44 29 44.62 79 48.98 39 15.91 89 19.49 30 44.77 80 49.03 40 16.02 90 19.54 31 44.91 81 49.08 41 16.13 91 19.59 32 45.05 82 49.14 42 16.23 92 19.64 33 45.19 83 49.19 43 16.33 93 19.68 34 45.31 84 49.24 44 16.43 94 19.73 35 45.44 85 49.29 45 16.53 95 19.78 36 45.56 86 49.34 46 16.63 96 19.82 37 45.68 87 49.40 47 16.72 97 19.87 38 45.80 88 49.44 48 16.81 98 19.91 39 45.91 89 49.49 49 16.90 99 19.96 40 46.02 90 49.54 50 16.99 100 20.00 41 46.13 91 49.59
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