Band pass filters for HF bands

3-pole Butterwoth filters. Have an input and output impedance Z=50 Ohms.

Range C1, C3, pF C2, pF L1, L3, mH L2, mH The lower frequency
cutoff MHz 1,8

3,5

7

14

21

28 4000

2000

1000

500

330

250 400

200

100

50

33

25 2,2

1,1

0,55

0,28

0,18

0,14 22

11

5,5

2,8

1,8

1,4 1,75

3,38

6,78

13.56 MHz

20,65

27,39

Literature

Publication: N. Bolshakov, rf.atnn.ru