Surface acoustic wave code reader

Details Surface acoustic wave code reader Surface acoustic wave code reader

1978-08-16

1980-07-01

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340149A, 340543, H04Q 300

Patent

active

042109000

ABSTRACT:
A system is disclosed for reading a code established by a surface acoustic wave device. The system has a first antenna connected to a supply for transmitting a signal, a second antenna for receiving said signal and supplying it to a first transducer on a surface acoustic wave device, the first transducer converting the signal into surface acoustic waves, a second transducer on the surface acoustic wave device for converting the surface acoustic waves to a coded signal, a third antenna for transmitting the coded signal, and a fourth antenna for receiving the coded signal and connected to a receiver for providing an output dependent upon the coded signal. This system is particularly useful for access control systems.

REFERENCES:
patent: 3299424 (1967-01-01), Jinding
patent: 3624608 (1971-11-01), Actman
patent: 3627992 (1971-12-01), Davies
patent: 3668662 (1972-06-01), Zimmerman
patent: 3780269 (1973-12-01), Hunn
patent: 3945099 (1976-03-01), Kansy

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