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ミスマッチング換算表(Return Loss-VSWR)

高周波回路での整合性はReturn Loss(不整合減衰量)やVSWR(Voltage Standing Wave Ratio、電圧定在波比) で表します。

  • Return Loss=20log10(VSWR+1/VSWR-1) (dB)
  • VSWR=(10R.L./20+1/10R.L./20-1)
VSWRReturn Loss (dB)Trans. Loss (dB)Volt. Refl CoeffPower Trans (%)Power Refl (%)
1.000.0000.00100.000.0
1.0146.10.0000.00100.000.0
1.0240.10.0000.01100.000.0
1.0336.60.0010.01100.000.0
1.0434.20.0020.02100.000.0
1.0532.30.0030.0299.900.1
1.0630.70.0040.0399.900.1
1.0729.40.0050.0399.900.1
1.0828.30.0060.0499.900.1
1.0927.30.0080.0499.800.2
1.1026.40.0100.0599.800.2
1.1125.70.0120.0599.700.3
1.1224.90.0140.0699.700.3
1.1324.30.0160.0699.600.4
1.1423.70.0190.0799.600.4
1.1523.10.0210.0799.500.5
1.1622.60.0240.0799.500.5
1.1722.10.0270.0899.400.6
1.1821.70.0300.0899.300.7
1.1921.20.0330.0999.200.8
1.2020.80.0360.0999.200.8
1.2120.40.0390.1099.100.9
1.2220.10.0430.1099.001.0
1.2319.70.0460.1098.901.1
1.2419.40.0500.1198.901.1
1.2519.10.0540.1198.801.2
1.2618.80.0580.1298.701.3
1.2718.50.0620.1298.601.4
1.2818.20.0660.1298.501.5
1.2917.90.0700.1398.401.6
1.3017.70.0750.1398.301.7
1.3217.20.0830.1498.101.9
1.3416.80.0930.1597.902.1
1.3616.30.1020.1597.702.3
1.3815.90.1120.1697.502.5
1.4015.80.1220.1797.202.8
1.4215.20.1330.1797.003.0
1.4414.90.1440.1896.703.3
1.4614.60.1550.1996.503.5
1.4814.30.1660.1996.303.7
1.5014.00.1770.2096.004.0
1.5213.70.1890.2195.704.3
1.5413.40.2010.2195.504.5
1.5613.20.2130.2295.204.8
1.5813.00.2250.2294.905.1
1.6012.70.2380.2394.705.3
1.6212.50.2500.2494.405.6
VSWRReturn Loss (dB)Trans. Loss (dB)Volt. Refl CoeffPower Trans (%)Power Refl (%)
1.6412.30.2630.2494.105.9
1.6612.10.2760.2593.806.2
1.6811.90.2890.2593.606.4
1.7011.70.3020.2693.306.7
1.7211.50.3150.2693.007.0
1.7411.40.3290.2792.707.3
1.7611.20.3420.2892.407.6
1.7811.00.3560.2892.107.9
1.8010.90.3700.2991.808.2
1.8210.70.3840.2991.508.5
1.8410.60.3980.3091.308.7
1.8610.40.4120.3091.009.0
1.8810.30.4260.3190.709.3
1.9010.20.4400.3190.409.6
1.9210.00.4540.3290.109.9
1.949.90.4680.3289.8010.2
1.969.80.4830.3289.5010.5
1.989.70.4970.3389.2010.8
2.009.50.5120.3388.9011.1
2.507.40.8810.4381.6018.4
3.006.01.2490.5075.0025.0
3.505.11.6030.5669.1030.9
4.004.41.9380.6064.0036.0
4.503.92.2550.6459.5040.5
5.003.52.5530.6755.6044.4
5.503.22.8340.6952.1047.9
6.002.93.1000.7149.0051.0
6.502.73.3510.7346.2053.8
7.002.53.5900.7543.7056.3
7.502.33.8170.7641.5058.5
8.002.24.0330.7839.5060.5
8.502.14.2400.7937.7062.3
9.001.94.4370.8036.0064.0
9.501.84.6260.8134.5065.5
10.001.74.8070.8233.1066.9
11.001.65.1490.8330.6069.4
12.001.55.4660.8528.4071.6
13.001.35.7620.8626.5073.5
14.001.26.0400.8724.9075.1
15.001.26.3010.8823.4076.6
16.001.16.5470.8822.1077.9
17.001.06.7800.8921.0079.0
18.001.07.0020.8919.9080.1
19.000.97.2120.9019.0081.0
20.000.97.4130.9018.1081.9
25.000.78.2990.9214.8085.2
30.000.69.0350.9412.5087.5

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