Converting Return Loss To Vswr - Agilent Technologies PSA Series Manual

Measurement Concepts
Equations and Conversion Table

Converting Return Loss to VSWR

Return loss can be expressed as a voltage standing wave ratio (VSWR)
value using the following table:
Table 2-1 Return Loss to VSWR Conversion
Return VSWR Return
Loss Loss
(dB) (dB)
4.0 4.42 14.0
6.0 3.01 14.2
8.0 2.32 14.4
10.0 1.92 14.6
10.5 1.85 14.8
11.0 1.78 15.0
11.2 1.76 15.2
11.4 1.74 15.4
11.6 1.71 15.6
11.8 1.69 15.8
12.0 1.67 16.0
12.2 1.65 16.2
12.4 1.63 16.4
12.6 1.61 16.6
12.8 1.59 16.8
13.0 1.58 17.0
13.2 1.56 17.2
13.4 1.54 17.4
13.6 1.53 17.6
13.8 1.51 17.8
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.
36
VSWR Return VSWR
Loss
(dB)
1.50 18.0 1.29
1.48 18.5 1.27
1.47 19.0 1.25
1.46 19.5 1.24
1.44 20.0 1.22
1.43 20.5 1.21
1.42 21.0 1.20
1.41 21.5 1.18
1.40 22.0 1.17
1.39 22.5 1.16
1.38 23.0 1.15
1.37 23.5 1.14
1.36 24.0 1.13
1.35 24.5 1.13
1.34 25.0 1.12
1.33 25.5 1.11
1.32 26.0 1.11
1.31 26.5 1.10
1.30 27.0 1.09
1.30 27.5 1.09
Return VSWR Return
Loss Loss
(dB) (dB)
28.0 1.08 38.0
28.5 1.08 38.5
29.0 1.07 39.0
29.5 1.07 39.5
30.0 1.07 40.0
30.5 1.06 40.5
31.0 1.06 41.0
31.5 1.05 41.5
32.0 1.05 42.0
32.5 1.05 42.5
33.0 1.05 43.0
33.5 1.04 43.5
34.0 1.04 44.0
34.5 1.04 44.5
35.0 1.04 45.0
35.5 1.03 45.5
36.0 1.03 46.0
36.5 1.03 46.5
37.0 1.03 47.0
37.5 1.03 47.5
VSWR
1.03
1.02
1.02
1.02
1.02
1.02
1.02
1.02
1.02
1.02
1.01
1.01
1.01
1.01
1.01
1.01
1.01
1.01
1.01
1.01
Chapter 2