Advanced science.  Applied technology.


Induction Field Coupled Transmission System Incorporating a Passive Transmitter: 5,542,118


A remote, unpowered passive transmitter has a tank circuit, a coil and capacitor. The capacitor is variable to vary the frequency of the tank. This is coupled to a receiver having a hybrid splitter. With four ports, two balanced, opposing ports connect to two lines terminating in line impedance. The tank couples into one of the two line so that a difference signal is formed and output. Line loading forms a signal indicating tank frequency.

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Thomas J. Warnagiris