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Induction Field Coupled Transmission System Incorporating a Passive Transmitter

Abstract: 

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.

Patent Number: 
5,542,118
Date Of Issue: 
07/30/1996
Inventors: 

Thomas J. Warnagiris