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R. F. IMPEDANCE BRIDGE FOR MEASURING REFLECTION COEFFICIENT

  • US 3,800,218 A
  • Filed: 02/07/1973
  • Issued: 03/26/1974
  • Est. Priority Date: 02/07/1973
  • Status: Expired due to Term
First Claim
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1. A bridge for measuring the reflection coefficient of a twoterminal load relative to a characteristic impedance Ro, said bridge having a first terminal for connection to said load, a second terminal for connection to a generator, a third terminal for connection to a receiver or a measuring device, a fourth terminal for connection to the respective ground terminals of said load, generator and receiver or measuring device, a fifth terminal, a resistance of value Ro being connected between said second terminal and said fifth terminal, a first two-terminal network being connected between said fifth terminal and said fourth terminal, a second Two-terminal network being connected between said first terminal and said second terminal, a balun having a balanced terminal pair and an unbalanced terminal pair, said balanced terminal pair being connected between said first terminal and said fifth terminal of said bridge, said unbalanced terminal pair being connected between said third terminal and said fourth terminal of said bridge, said second network having an impedance which is substantially equal to the inverse, with respect to Ro, of the parallel combination of said first network and the effective load presented by said balun between said fifth terminal of said bridge and ground.

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