Multiplexed surface acoustical wave apparatus

Details Multiplexed surface acoustical wave apparatus Multiplexed surface acoustical wave apparatus

1989-08-28

1991-02-19

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

310313D, 333195, H04Q 139, H01L 41107

Patent

active

049947982

ABSTRACT:
An apparatus is featured for controlling remote devices. The status or one or more switches associated with remote devices may be transmitted along a single transmission line. One end of the transmission line contains a surface acoustical wave (SAW) delay line. The SAW delay line responds to an interrogation pulse of radio frequency electromagnetic energy with a series of delayed pulses, each of which transmits the status of a switch by means of the presence or absence of the pulse. The SAW delay line and switches are completely passive, requiring no power source. The transmission line may optionally be interrupted and coupled by means of a pair of inductive coils. This offers the potential for rotation, as within a steering column of an automobile, without wear or damage to the transmission line. The other end of the transmission line contains electronic circuitry to provide the interrogation pulse, to decode the return delayed pulses, and to drive other circuitry as required by the switch positions.

REFERENCES:
patent: 3889065 (1975-06-01), Alsup
patent: 4096477 (1978-06-01), Epstein et al.
patent: 4265124 (1981-05-01), Lim et al.
patent: 4442515 (1984-04-01), Meidzler
patent: 4737789 (1988-04-01), Nysen
patent: 4746830 (1988-05-01), Holland

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