SHORT RANGE DATA COMMUNICATIONS (FROM CARNAHAN CONFERENCE ON ELECTRONIC CRIME COUNTERMEASURES, 1973 - PROCEEDINGS, BY J S JACKSON AND R W DEVORE - SEE NCJ-10890)

• NCJ Number: 27561
• Author(s): J P VINDING
• Date Published: 1973
• Length: 7 pages
• Corporate Author: University of Kentucky; Institute of Electrical and Electronics Engineers
• Publication Format: Document
• Language: English
• Country: United States of America

Annotation

PRESENTATION OF NEW COMMUNICATIONS TECHNIQUE WHICH ONLY ALLOWS TRANSMISSION OF SMALL AMOUNTS OF DATA OVER SHORT DISTANCES, BUT WHICH CONSERVES PRECIOUS SPECTRUM SPACE AND AVOIDS ELECTROMAGNETIC INTERFERENCE.

Abstract

THE SYSTEM IS BASED ON THE NEAR-FIELD INTERACTION BETWEEN TUNED CIRCUITS LOOSELY COUPLED. PERIODIC VARIATIONS OF THE PASSIVE CIRCUIT MAKES THE REACTION ON THE DRIVEN CIRCUIT DETECTABLE OVER USEFUL DISTANCES AND PROVIDES THE MEANS FOR TRANSMITTING INFORMATION FROM THE PASSIVE TO THE DRIVEN CIRCUIT. THE SYSTEM AVOIDS ELECTROMAGNETIC INTERFERENCE BY OPERATING ON THE NEAR FIELD OF ESSENTIALLY NON-RADIATING STRUCTURES. THE SIMPLICITY OF THE CIRCUITS ASSURES INITIAL COST COMPARABLE TO OR LOWER THAN RADIO TRANSMISSION SYSTEMS AND NEGLIGIBLE MAINTENANCE EXPENSE. APPLICATIONS OF THE NEW DATA COMMUNICATIONS TECHNIQUE INCLUDE A VARIETY OF IDENTIFICATION AND TELEMETRY SYSTEMS OF WHICH MANY ARE RELATED TO SECURITY OR LAW ENFORCEMENT. A FEW EXAMPLES ARE DETECTION OF SHOPLIFTERS, DOOR LOCK CONTROL, VEHICLE LOCATION, AND PERIMETER CONTROL. (AUTHOR ABSTRACT)