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)
| VSWR | Return Loss (dB) | Trans. Loss (dB) | Volt. Refl Coeff | Power Trans (%) | Power Refl (%) |
|---|---|---|---|---|---|
| 1.00 | — | 0.000 | 0.00 | 100.00 | 0.0 |
| 1.01 | 46.1 | 0.000 | 0.00 | 100.00 | 0.0 |
| 1.02 | 40.1 | 0.000 | 0.01 | 100.00 | 0.0 |
| 1.03 | 36.6 | 0.001 | 0.01 | 100.00 | 0.0 |
| 1.04 | 34.2 | 0.002 | 0.02 | 100.00 | 0.0 |
| 1.05 | 32.3 | 0.003 | 0.02 | 99.90 | 0.1 |
| 1.06 | 30.7 | 0.004 | 0.03 | 99.90 | 0.1 |
| 1.07 | 29.4 | 0.005 | 0.03 | 99.90 | 0.1 |
| 1.08 | 28.3 | 0.006 | 0.04 | 99.90 | 0.1 |
| 1.09 | 27.3 | 0.008 | 0.04 | 99.80 | 0.2 |
| 1.10 | 26.4 | 0.010 | 0.05 | 99.80 | 0.2 |
| 1.11 | 25.7 | 0.012 | 0.05 | 99.70 | 0.3 |
| 1.12 | 24.9 | 0.014 | 0.06 | 99.70 | 0.3 |
| 1.13 | 24.3 | 0.016 | 0.06 | 99.60 | 0.4 |
| 1.14 | 23.7 | 0.019 | 0.07 | 99.60 | 0.4 |
| 1.15 | 23.1 | 0.021 | 0.07 | 99.50 | 0.5 |
| 1.16 | 22.6 | 0.024 | 0.07 | 99.50 | 0.5 |
| 1.17 | 22.1 | 0.027 | 0.08 | 99.40 | 0.6 |
| 1.18 | 21.7 | 0.030 | 0.08 | 99.30 | 0.7 |
| 1.19 | 21.2 | 0.033 | 0.09 | 99.20 | 0.8 |
| 1.20 | 20.8 | 0.036 | 0.09 | 99.20 | 0.8 |
| 1.21 | 20.4 | 0.039 | 0.10 | 99.10 | 0.9 |
| 1.22 | 20.1 | 0.043 | 0.10 | 99.00 | 1.0 |
| 1.23 | 19.7 | 0.046 | 0.10 | 98.90 | 1.1 |
| 1.24 | 19.4 | 0.050 | 0.11 | 98.90 | 1.1 |
| 1.25 | 19.1 | 0.054 | 0.11 | 98.80 | 1.2 |
| 1.26 | 18.8 | 0.058 | 0.12 | 98.70 | 1.3 |
| 1.27 | 18.5 | 0.062 | 0.12 | 98.60 | 1.4 |
| 1.28 | 18.2 | 0.066 | 0.12 | 98.50 | 1.5 |
| 1.29 | 17.9 | 0.070 | 0.13 | 98.40 | 1.6 |
| 1.30 | 17.7 | 0.075 | 0.13 | 98.30 | 1.7 |
| 1.32 | 17.2 | 0.083 | 0.14 | 98.10 | 1.9 |
| 1.34 | 16.8 | 0.093 | 0.15 | 97.90 | 2.1 |
| 1.36 | 16.3 | 0.102 | 0.15 | 97.70 | 2.3 |
| 1.38 | 15.9 | 0.112 | 0.16 | 97.50 | 2.5 |
| 1.40 | 15.8 | 0.122 | 0.17 | 97.20 | 2.8 |
| 1.42 | 15.2 | 0.133 | 0.17 | 97.00 | 3.0 |
| 1.44 | 14.9 | 0.144 | 0.18 | 96.70 | 3.3 |
| 1.46 | 14.6 | 0.155 | 0.19 | 96.50 | 3.5 |
| 1.48 | 14.3 | 0.166 | 0.19 | 96.30 | 3.7 |
| 1.50 | 14.0 | 0.177 | 0.20 | 96.00 | 4.0 |
| 1.52 | 13.7 | 0.189 | 0.21 | 95.70 | 4.3 |
| 1.54 | 13.4 | 0.201 | 0.21 | 95.50 | 4.5 |
| 1.56 | 13.2 | 0.213 | 0.22 | 95.20 | 4.8 |
| 1.58 | 13.0 | 0.225 | 0.22 | 94.90 | 5.1 |
| 1.60 | 12.7 | 0.238 | 0.23 | 94.70 | 5.3 |
| 1.62 | 12.5 | 0.250 | 0.24 | 94.40 | 5.6 |
| VSWR | Return Loss (dB) | Trans. Loss (dB) | Volt. Refl Coeff | Power Trans (%) | Power Refl (%) |
| 1.64 | 12.3 | 0.263 | 0.24 | 94.10 | 5.9 |
| 1.66 | 12.1 | 0.276 | 0.25 | 93.80 | 6.2 |
| 1.68 | 11.9 | 0.289 | 0.25 | 93.60 | 6.4 |
| 1.70 | 11.7 | 0.302 | 0.26 | 93.30 | 6.7 |
| 1.72 | 11.5 | 0.315 | 0.26 | 93.00 | 7.0 |
| 1.74 | 11.4 | 0.329 | 0.27 | 92.70 | 7.3 |
| 1.76 | 11.2 | 0.342 | 0.28 | 92.40 | 7.6 |
| 1.78 | 11.0 | 0.356 | 0.28 | 92.10 | 7.9 |
| 1.80 | 10.9 | 0.370 | 0.29 | 91.80 | 8.2 |
| 1.82 | 10.7 | 0.384 | 0.29 | 91.50 | 8.5 |
| 1.84 | 10.6 | 0.398 | 0.30 | 91.30 | 8.7 |
| 1.86 | 10.4 | 0.412 | 0.30 | 91.00 | 9.0 |
| 1.88 | 10.3 | 0.426 | 0.31 | 90.70 | 9.3 |
| 1.90 | 10.2 | 0.440 | 0.31 | 90.40 | 9.6 |
| 1.92 | 10.0 | 0.454 | 0.32 | 90.10 | 9.9 |
| 1.94 | 9.9 | 0.468 | 0.32 | 89.80 | 10.2 |
| 1.96 | 9.8 | 0.483 | 0.32 | 89.50 | 10.5 |
| 1.98 | 9.7 | 0.497 | 0.33 | 89.20 | 10.8 |
| 2.00 | 9.5 | 0.512 | 0.33 | 88.90 | 11.1 |
| 2.50 | 7.4 | 0.881 | 0.43 | 81.60 | 18.4 |
| 3.00 | 6.0 | 1.249 | 0.50 | 75.00 | 25.0 |
| 3.50 | 5.1 | 1.603 | 0.56 | 69.10 | 30.9 |
| 4.00 | 4.4 | 1.938 | 0.60 | 64.00 | 36.0 |
| 4.50 | 3.9 | 2.255 | 0.64 | 59.50 | 40.5 |
| 5.00 | 3.5 | 2.553 | 0.67 | 55.60 | 44.4 |
| 5.50 | 3.2 | 2.834 | 0.69 | 52.10 | 47.9 |
| 6.00 | 2.9 | 3.100 | 0.71 | 49.00 | 51.0 |
| 6.50 | 2.7 | 3.351 | 0.73 | 46.20 | 53.8 |
| 7.00 | 2.5 | 3.590 | 0.75 | 43.70 | 56.3 |
| 7.50 | 2.3 | 3.817 | 0.76 | 41.50 | 58.5 |
| 8.00 | 2.2 | 4.033 | 0.78 | 39.50 | 60.5 |
| 8.50 | 2.1 | 4.240 | 0.79 | 37.70 | 62.3 |
| 9.00 | 1.9 | 4.437 | 0.80 | 36.00 | 64.0 |
| 9.50 | 1.8 | 4.626 | 0.81 | 34.50 | 65.5 |
| 10.00 | 1.7 | 4.807 | 0.82 | 33.10 | 66.9 |
| 11.00 | 1.6 | 5.149 | 0.83 | 30.60 | 69.4 |
| 12.00 | 1.5 | 5.466 | 0.85 | 28.40 | 71.6 |
| 13.00 | 1.3 | 5.762 | 0.86 | 26.50 | 73.5 |
| 14.00 | 1.2 | 6.040 | 0.87 | 24.90 | 75.1 |
| 15.00 | 1.2 | 6.301 | 0.88 | 23.40 | 76.6 |
| 16.00 | 1.1 | 6.547 | 0.88 | 22.10 | 77.9 |
| 17.00 | 1.0 | 6.780 | 0.89 | 21.00 | 79.0 |
| 18.00 | 1.0 | 7.002 | 0.89 | 19.90 | 80.1 |
| 19.00 | 0.9 | 7.212 | 0.90 | 19.00 | 81.0 |
| 20.00 | 0.9 | 7.413 | 0.90 | 18.10 | 81.9 |
| 25.00 | 0.7 | 8.299 | 0.92 | 14.80 | 85.2 |
| 30.00 | 0.6 | 9.035 | 0.94 | 12.50 | 87.5 |
