Attenuators
Table 1. Attenuator resistor values for Zo=50 ohms.
(You can scale the values for any other Zo)
 | Attenuation, dB | Pi Attenuator | Tee Attenuator |
|---|
| (Zo=50 ohms) | R1 ohm | R2 ohm | R1 ohm | R2 ohm |
| 1 | 869.5 | 5.8 | 2.9 | 433.3 |
| 2 | 436.2 | 11.6 | 5.7 | 215.2 |
| 3 | 292.4 | 17.6 | 8.5 | 141.9 |
| 4 | 221.0 | 23.8 | 11.3 | 104.8 |
| 5 | 178.5 | 30.4 | 14.0 | 82.2 |
| 6 | 150.5 | 37.4 | 16.6 | 66.9 |
| 7 | 130.7 | 44.8 | 19.1 | 55.8 |
| 8 | 116.1 | 52.8 | 21.5 | 47.3 |
| 9 | 105.0 | 61.6 | 23.8 | 40.6 |
| 10 | 96.2 | 71.2 | 26.0 | 35.1 |
| 11 | 89.2 | 81.7 | 28.0 | 30.6 |
| 12 | 83.5 | 93.2 | 29.9 | 26.8 |
| 13 | 78.8 | 106.1 | 31.7 | 23.6 |
| 14 | 74.9 | 120.3 | 33.4 | 20.8 |
| 15 | 71.6 | 136.1 | 34.9 | 18.4 |
| 16 | 68.8 | 153.8 | 36.3 | 16.3 |
| 17 | 66.4 | 173.5 | 37.6 | 14.4 |
| 18 | 64.4 | 195.4 | 38.8 | 12.8 |
| 19 | 62.6 | 220.0 | 39.9 | 11.4 |
| 20 | 61.1 | 247.5 | 40.9 | 10.1 |
| 30 | 53.3 | 789.8 | 46.9 | 3.2 |
| 40 | 51.0 | 2499.8 | 49.0 | 1.0 |
| 50 | 50.3 | 7905.6 | 49.7 | 0.32 |
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