Pi & T Attenuators Network based on 50 Ohm

 

 

Pi Network (Z1 = Z2  or  Z in = Z out)

 

 !!! Use non-inductive resistors like carbon !!!
 
How much db ?
parallel resistor
series resistor


A practical example of a Pi attenuator:

 

 

 

Geg: Z in=50Ohn;Z out=50Ohm;L=7db

 

1.st
2.nd 
3.rd  

R1/R2=130,6Ohm 

R3=44.8Ohm

db

R1/R2 in Ohm

R3 in Ohm            
1 870.0 5.8
2 436.0 11.6
3 292.0 17.6
4 221.0 23.8
5 178.6 30.4
6 150.5 37.3
7 130.7 44.8
8 116.0 52.8
9 105.0 61.6
10 96.2 71.2
11 89.2 81.6
12 83.5 93.2
13 78.8 106.0
14 74.9 120.3
15 71.6 136.1
16 68.8 153.8
17 66.4 173.4
18 64.4 195.4
19 62.6 220.0
20 61.0 247.5
21 59.7 278.2
22 58.6 312.7
23 57.6 351.9
24 56.7 394.6

 

 

 

T Network (Z1 = Z2  or  Z in = Z out)

 

!!! Use non-inductive resistors like carbon !!!

 

How much db ?
series resistor
parallel resistor

 

A practical example of a T attenuator:

Geg: Z in=50Ohn;Z out=50Ohm;L=7db

 

 

1.st  
2.nd
3.rd 

R1/R2=19.1Ohm

R3=55.8Ohm

db

 R1/R2 in Ohm R3 in Ohm
1 2.9 433.3
2 5.7 215.2
3 8.5 141.9
4 11.3 104.8
5 14.0 82.2
6 16.6 66.9
7 19.0 55.8
8 21.5 47.3
9 23.8 40.6
10 26.0 35.0
11 28.0 30.6
12 30.0 26.8
13 31.7 23.5
14 33.3 20.8
15 35.0 18.4
16 36.3 16.2
17 37.6 14.4
18 38.8 12.8
19 40.0 11.4
20 41.0 10.0
21 41.8 9.0
22 42.6 8.0
23 43.4 7.1
24 44.0 6.3

 

asymetric attenuators comming soon ...