Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1994-09-30
1996-06-04
Peng, John K.
Communications: electrical
Continuously variable indicating
With particular transmitter
34082554, 34082569, 455 41, 343787, 343873, G08C 1906
Patent
active
055237509
ABSTRACT:
RF communication through an RF barrier is facilitated by an RF field concentrating core that is lodged within an opening through the barrier and extends out from at least one side of the barrier. An antenna coil is wound around the core, with a capacitor connected across the coil to establish a parallel resonant circuit at the exciting frequency. The core/coil combination provides a bidirectional RF coupler for transmitting signals between opposite sides of the barrier. It is particularly useful for transponder systems in which a transponder is located within an RF-blocking enclosure, and is interrogated by an exciter/reader outside the enclosure.
REFERENCES:
patent: 3761938 (1973-09-01), Reggia
patent: 4730188 (1988-03-01), Milheiser
patent: 4983963 (1991-01-01), Hodgetts et al.
Hill Andrew
Palomar Technologies Corporation
Peng John K.
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