Patent ID: 6313713
Filing Date: 2001-11-06
Classification: H04B

Abstract:
A matched pair circulator isolation circuit comprising:a first RF circulator for connecting to an output signal source;a power divider connected to the first RF circulator for dividing a portion of the output signal into a higher power signal and a lower power signal;a first phase shifter having an adjustable amplitude output connected to the higher power signal for outputting a coarse adjustment signal;a second RF circulator connected to the first RF circulator for connecting the output signal to a load and for receiving an input signal from an input signal source;a first directional coupler connected to the second RF circulator and the first phase shifter for superimposing the coarse adjustment signal onto the input signal to output a first isolated signal;a second phase shifter having an adjustable amplitude output connected to the lower power signal for outputting a fine adjustment signal;and a second directional coupler coupled to the second phase shifter and the first directional coupler for superimposing the fine adjustment signal onto the first isolated signal to output a second isolated signal.