Combination transmission system phase and impedance sensor having a single center-tapped probe

Claim 1

IN A DEVICE FOR MEASURING AN ACTIVE CHARACTERISTIC OF A TRANSMISSION LINE, THE COMBINATION OF SENSOR MEANS DEFINING TWO SENSOR LOOPS HAVING A COMMON CENTER LEG AND TWO OUTER LEGS, SAID SENSOR MEANS BEING ARRANGED FOR OPERATIVE ASSOCIATION WITH A TRANSMISSION LINE, FIRST CIRCUIT MEANS CONNECTED TO SAID COMMON LEG AND OPERATIVE TO DERIVE FROM SAID SENSOR MEANS AN ELECTRICAL QUANTITY RELATED TO THE POTENTIAL WITHIN THE TRANSMISSION LINE, SECOND CIRCUIT MEANS CONNECTED BETWEEN SAID OUTER LEGS AND OPERATIVE TO DERIVE FROM SAID SENSOR MEANS AN ELECTRICAL QUANTITY RELATED TO THE CURRENT WITHIN THE TRANSMISSION LINE, SAID SECOND CIRCUIT MEANS INCLUDING A SERIALLY CONNECTED INDUCTANCE THEREIN TO COMPENSATE FOR INCREASES OF POTENTIAL DUE TO INCREASE IN FREQUENCY, AND COMPARING MEANS CONNECTED TO SAID FIRST AND SECOND CIRCUIT MEANS TO COMPARE SAID DERIVED ELECTRICAL QUANTITIES AND TO DERIVE FROM SAID COMPARISON AN ELECTRICAL QUANTITY PROPORTIONAL TO THE ABSOLUTE MAGNITUDE OF THE IMPEDANCE WITHIN THE TRANSMISSION LINE.