Responder device
First Claim
5. IN A PASSIVE RESPONDER DEVICE FOR RECEIVING AN INTERROGATOR SIGNAL AND FOR DEVELOPING THEREFROM A COMPOSITE SIGNAL INCLUDING A DIRECT CURRENT VOLTAGE AND A PLURALITY OF AUDIO FREQUENCY CURRENTS, AN OSCILLATOR CIRCUIT COMPRISING AN ANTI-RESONANT TANK CIRCUIT, A TRANSISTOR HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE, A RESISTIVE ELEMENT COUPLED TO THE BASE ELECTRODE OF THE TRANSISTOR FOR PASSING THE AUDIO FREQUENCY CURRENTS THERETO, SAID ANTI-RESONANT TANK CIRCUIT INCLUDING A TWO-WINDING RADIO FREQUENCY TRANSFORMER HAVING ONE WINDING THEREOF COUPLED ACROSS A FIRST CAPACITOR, SAID TANK CIRCUIT BEING COUPLED TO THE COLLECTOR ELECTRODE OF THE TRANSISTOR, A SECOND WINDING OF THE TRANSFORMER BEING CONNECTED IN SERIES WITH A SECOND CAPACITOR AND BEING COUPLED BETWEEN THE EMITTER ELECTRODE AND THE BASE ELECTRODE OF THE TRANSISTOR, SAID SECOND CAPACITOR BEING OPERABLE TO PASS RADIO FREQUENCY CURRENTS OF THE RESPONSE FREQUENCY AND BEING FURTHER OPERABLE TO BLOCK THE AUDIO FREQUENCY CURRENTS, SAID SECOND CAPACITOR AND SAID TRANSFORMER PROVIDING A REGENERATIVE FEEDBACK PATH BETWEEN THE BASE ELECTRODE AND THE COLLECTOR ELECTRODE OF THE TRANSISTOR, SAID REGENERATIVE FEEDBACK PATH INCLUDING A TANK CIRCUIT WHEREBY OSCILLATIONS ARE GENERATED AT A PREDETERMINED RESPONSE FREQUENCY, SAID AUDIO FREQUENCY CURRENTS PASSED BY THE RESISTIVE ELEMENT BEING OPERABLE TO MODULATE THE RESPONSE FREQUENCY OSCILLATIONS TO DEVELOP A CODED RESPONSE SIGNAL.
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Accused Products
4 Citations
5 Claims
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5. IN A PASSIVE RESPONDER DEVICE FOR RECEIVING AN INTERROGATOR SIGNAL AND FOR DEVELOPING THEREFROM A COMPOSITE SIGNAL INCLUDING A DIRECT CURRENT VOLTAGE AND A PLURALITY OF AUDIO FREQUENCY CURRENTS, AN OSCILLATOR CIRCUIT COMPRISING AN ANTI-RESONANT TANK CIRCUIT, A TRANSISTOR HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE, A RESISTIVE ELEMENT COUPLED TO THE BASE ELECTRODE OF THE TRANSISTOR FOR PASSING THE AUDIO FREQUENCY CURRENTS THERETO, SAID ANTI-RESONANT TANK CIRCUIT INCLUDING A TWO-WINDING RADIO FREQUENCY TRANSFORMER HAVING ONE WINDING THEREOF COUPLED ACROSS A FIRST CAPACITOR, SAID TANK CIRCUIT BEING COUPLED TO THE COLLECTOR ELECTRODE OF THE TRANSISTOR, A SECOND WINDING OF THE TRANSFORMER BEING CONNECTED IN SERIES WITH A SECOND CAPACITOR AND BEING COUPLED BETWEEN THE EMITTER ELECTRODE AND THE BASE ELECTRODE OF THE TRANSISTOR, SAID SECOND CAPACITOR BEING OPERABLE TO PASS RADIO FREQUENCY CURRENTS OF THE RESPONSE FREQUENCY AND BEING FURTHER OPERABLE TO BLOCK THE AUDIO FREQUENCY CURRENTS, SAID SECOND CAPACITOR AND SAID TRANSFORMER PROVIDING A REGENERATIVE FEEDBACK PATH BETWEEN THE BASE ELECTRODE AND THE COLLECTOR ELECTRODE OF THE TRANSISTOR, SAID REGENERATIVE FEEDBACK PATH INCLUDING A TANK CIRCUIT WHEREBY OSCILLATIONS ARE GENERATED AT A PREDETERMINED RESPONSE FREQUENCY, SAID AUDIO FREQUENCY CURRENTS PASSED BY THE RESISTIVE ELEMENT BEING OPERABLE TO MODULATE THE RESPONSE FREQUENCY OSCILLATIONS TO DEVELOP A CODED RESPONSE SIGNAL.
Specification
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- Resources
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Current AssigneeCharles A. Kingsford-Smith
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Original AssigneeCharles A. Kingsford-Smith
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InventorsKingsford-smith, Charles A.
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Application NumberUS04/019,860Time in Patent Office1,121 DaysField of SearchUS Class Current340/10.4CPC Class CodesB61L 25/04 Indicating or recording tra...
