This paper presents a discovery that Metaphysics Electricity Bridge (MEB) Principle(MEBP) can be applied to the auto gain control (AGC) of the radio frequency (RF) channels

including active and passive circuits.In this paper

the basic theory of MEBP AGC is discussed

which consists of the transfer function

AGC transfer voltage

the limit gain precision of the MEBP AGC model

and the MEB balance model (MEBM).Further

the design of the MEBP AGC is provided

and the corresponding principle

AGC transfer voltage formed

is also delivered.Finally

the effectiveness of the MEBP AGC was demonstrated through S band RF channel

and the output power curve was plotted out of the temperature experiment data.The result indicates that the gain error of MEBP AGC is less than 0.2 dB.