Wireless passive biological telemetry system

• US 3,218,638 A
• Filed: 05/29/1962
• Issued: 11/16/1965
• Est. Priority Date: 05/29/1962
• Status: Expired due to Term

• Current Assignee: William M. Honig
• Original Assignee: William M. Honig
• Inventors: Honig, William M.
• Application Number:
  US04/198,483
• Time in Patent Office: 1,267 Days
• US Class Current: 342/50
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 7/08 Ferrite rod or like elongated core
• CPC Class Codes: Y10S 128/903 Radio telemetry

Claims

1. A PASSIVE TELEMETRY APPARATUS COMPRISING A PASSIVE SENSING CELL INCLUDING A FERRITE ANTENNA HAVING THREE SUBSTANTIALLY MUTUALLY PERPENDICULAR ARMS, AND ELCTRICALLY VARIABLE CAPACITANCE ELEMENT CONNECTED TO SAID ANTENNA TO CAUSE THE FREQUENCY RESPONSE OF SAID ANTENNA TO VARY IN ACCORDANCE WITH THE CAPACITANCE VALUE OF SAID CAPACITANACE ELEMENT, A TRANSFORMER CONNECTED TO SAID CAPCITANCE ELEMENT, SAID TRANSFORMER HAVING AT LEAST A TEN TO ONE TURNS RATIO WITH A HIGH VOLTAGE SIDE OF SAID TRANSFORMER CONNECTED TO SAID CAPACITANCE ELEMENT AND THE LOW VOLTAGE SIDE CONNECTED TO LEADS TO RECEIVE AN ELECTRICAL SIGNAL TO BE SENSED, MEANS IN SAID ANTENNA CIRCUIT FOR BLOCKING THE RELATIVELY LOW FREQUENCY SIGNALS FROM SAID TRANSFORMER, AND MEANS IN CIRCUIT WITH SAID TRANSFORMER FOR BLOCKING THE RADIO FREQUENCY SIGNALS FROM SAID ANTENNA;

A RADIO FREQUENCY TRANSMITTER HAVING A FREQUENCY RANGE INCLUDING THE FREQUENCY RESPONSE TO SAID ANTENNA;

A RADIO FREQUENCY RECEIVER ARRANGED TO RECEIVE SIGNALS TRANSMITTED BY SAID TRANSMITTER AND ALTERED BY RECEPTION BY SAID ANTENNA;

MEANS COUPLED TO RECEIVE SIGNALS FROM SAID RECEIVER FOR DETECTING THE INSTANTANEOUS FREQUENCY RESPONSE OF SAID ANTENNA;

AND AN INDICATOR COUPLED TO SAID DETECTING MEANS FOR PROVIDING A DIRECT INDICATION OF A CONDITION REPRESENTED BY THE VOLTAGE AT SAID TRANSFORMER INPUT LEADS.