Induction field coupled transmission system incorporating a pass

Details Induction field coupled transmission system incorporating a pass Induction field coupled transmission system incorporating a pass

1994-09-13

1996-07-30

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Short range rf communication

34082573, 34087037, 340562, 455290, H04B 500

Patent

active

055421180

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.

REFERENCES:
patent: 3656132 (1972-04-01), Brumbelow
patent: 3723966 (1973-03-01), Mueller
patent: 3737911 (1973-06-01), Sakurgai et al.
patent: 4027286 (1977-05-01), Mavosko
patent: 4578992 (1986-04-01), Galasko
patent: 4618822 (1986-10-01), Hansen
patent: 5227798 (1993-07-01), Hildebrand

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