Dual Coupler 取直

目的 :

Dual Coupler 分 

FW  順向 Power

RV  反向  Power

開路時  

目標  FW = RV

實際做法 :

讀 FW  &  RV

RV=讀  RV + Offset

exp.

-5@1GHz    FW

-4@ GHz     RV

offset  = ( FW-RV)  = -1

exp 2

-10@2GHz ..... FW

-12@2GHz ----RF

Offset = -10-(-12) = 2dB

RV = 讀 RF+ Offset = 12+2 = -10dB