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Return loss bridge circuit

  • US 20080265917A1
  • Filed: 10/17/2007
  • Published: 10/30/2008
  • Est. Priority Date: 10/18/2006
  • Status: Abandoned Application
First Claim
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1. A return loss bridge circuit for testing a balanced test impedance, the balanced test impedance having a first electrical end and a second electrical end, which comprises:

  • an input connector electrically connectable to an output of a network analyzer;

    a reflection connector electrically connectable to an input of the network analyzer, each of the input connector and the reflection connector having a signal conductor;

    a reference impedance having a first electrical end and a second electrical end, the first electrical end of the reference impedance being in electrical communication with the signal conductor of the input connector, the second electrical end of the reference impedance being in electrical communication with the signal conductor of the reflectance connector;

    a first transformer and a second transformer, each of the first and second transformers having a first winding and a second winding, each of the first and second windings of the first and second transformers having a first electrical end and a second electrical end; and

    a first common mode choke, the first common mode choke having a first winding and a second winding, each of the first and second windings of the first common mode choke having a first electrical end and a second electrical end, the first electrical end of the first winding of the first transformer being electrically connected to the signal conductor of the input connector and being in electrical communication with the first electrical end of the reference impedance, the second electrical end of the first winding of the first transformer being electrically connected to the second electrical end of the second winding of the second transformer, the first electrical end of the second winding of the first transformer being electrically connected to the first electrical end of the second winding of the second transformer and to ground, the second electrical end of the second winding of the first transformer being electrically connected to the first electrical end of the first winding of the first common mode choke, the first electrical end of the first winding of the second transformer being electrically connected to the signal conductor of the reflection connector and being in electrical communication with the second electrical end of the reference impedance, the second electrical end of the first winding of the second transformer being electrically connected to the first electrical end of the second winding of the first common mode choke, the second electrical end of the first winding of the first common mode choke being electrically connectable to the first electrical end of the balanced test impedance, the second electrical end of the second winding of the first common mode choke being electrically connectable to the second electrical end of the balanced test impedance.

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