Making Complex Measurements

Making a Reflection Calibration Measurement

Converting Return Loss to VSWR

Return loss can be expressed as a voltage standing wave ratio (VSWR) value using the following table or formula:

Table 2-1

 

Power to VSWR Conversion

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Return

VSWR

 

Return

 

VSWR

 

 

Return

VSWR

 

Return

VSWR

 

Return

VSWR

 

Loss

 

 

Loss

 

 

 

 

Loss

 

 

Loss

 

 

Loss

 

 

(dB)

 

 

(dB)

 

 

 

 

(dB)

 

 

(dB)

 

 

(dB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.0

4.42

 

14.0

 

1.50

 

 

18.0

1.29

 

28.0

1.08

 

38.0

1.03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6.0

3.01

 

14.2

 

1.48

 

 

18.5

1.27

 

28.5

1.08

 

38.5

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8.0

2.32

 

14.4

 

1.47

 

 

19.0

1.25

 

29.0

1.07

 

39.0

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10.0

1.92

 

14.6

 

1.46

 

 

19.5

1.24

 

29.5

1.07

 

39.5

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10.5

1.85

 

14.8

 

1.44

 

 

20.0

1.22

 

30.0

1.07

 

40.0

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.0

1.78

 

15.0

 

1.43

 

 

20.5

1.21

 

30.5

1.06

 

40.5

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.2

1.76

 

15.2

 

1.42

 

 

21.0

1.20

 

31.0

1.06

 

41.0

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.4

1.74

 

15.4

 

1.41

 

 

21.5

1.18

 

31.5

1.05

 

41.5

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.6

1.71

 

15.6

 

1.40

 

 

22.0

1.17

 

32.0

1.05

 

42.0

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.8

1.69

 

15.8

 

1.39

 

 

22.5

1.16

 

32.5

1.05

 

42.5

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12.0

1.67

 

16.0

 

1.38

 

 

23.0

1.15

 

33.0

1.05

 

43.0

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12.2

1.65

 

16.2

 

1.37

 

 

23.5

1.14

 

33.5

1.04

 

43.5

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12.4

1.63

 

16.4

 

1.36

 

 

24.0

1.13

 

34.0

1.04

 

44.0

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12.6

1.61

 

16.6

 

1.35

 

 

24.5

1.13

 

34.5

1.04

 

44.5

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12.8

1.59

 

16.8

 

1.34

 

 

25.0

1.12

 

35.0

1.04

 

45.0

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13.0

1.58

 

17.0

 

1.33

 

 

25.5

1.11

 

35.5

1.03

 

45.5

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13.2

1.56

 

17.2

 

1.32

 

 

26.0

1.11

 

36.0

1.03

 

46.0

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13.4

1.54

 

17.4

 

1.31

 

 

26.5

1.10

 

36.5

1.03

 

46.5

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13.6

1.53

 

17.6

 

1.30

 

 

27.0

1.09

 

37.0

1.03

 

47.0

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13.8

1.51

 

17.8

 

1.30

 

 

27.5

1.09

 

37.5

1.03

 

47.5

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–RL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

----------

 

 

 

 

 

 

 

 

 

 

 

VSWR

1 + 10

20

 

 

 

 

 

 

 

 

 

 

 

= -----------------------

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–RL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

----------

 

 

 

 

 

 

 

 

 

 

 

 

 

1 – 10 20

 

 

 

 

 

 

 

Where: RL is the measured return loss value.

VSWR is sometimes stated as a ratio. For example: 1.2:1 “one point two to one” VSWR. The first number is the VSWR value taken from the table or calculated using the formula. The second number is always 1.

Chapter 2

87

Page 87
Image 87
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