SWR / Reflected Power Formulas

Table Of Definition
VSWR	=	Standing wave ratio in VSWR or SWR in number of ratio to 1
PFWD	=	Forward power in watts
PREF	=	Reflected power in watts
P%REF	=	Reflected power percentage of the forward power in percent
RLdb	=	Return Loss in decibels

Convert Forward And Reflected Power to VSWR:

VSWR = (1 + SQRT(PREF / PFWD)) / (1 – SQRT(PREF / PFWD))

Convert VSWR to Reflected Power percentage :

P%REF = (VSWR - 1)² / (VSWR + 1)² x 100

Convert Forward and Reflected Power to Reflected Power percentage :

P%REF = PREF / PFWD x 100

Return Loss in decibels (RLdb):

Definition: Return loss is the ratio between Forward and Reflected Power in decibels. Return loss decibel is mostly read by the the antenna analyzer test equipment.

Convert Forward and Reflected Power to Return loss in decibels:

RLdb = 10 log (PFWD / PREF)

Convert Return Loss decibels to Reflected Power Percentage:

P%REF = 1 / 10^{(RLdb / 10)}x 100

Convert Forward Power by Return Loss decibels to Reflected Power :

PREF = PFWD / 10^{(RLdb / 10)}