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Application for a radio frequency identification system

An antenna system, the technology of the antenna, applied in the application field of the system in the library, can solve the problems such as not described or mentioned

Inactive Publication Date: 2001-09-12
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many important or desired library or other inventory functions are retained, not described or mentioned in the '660 disclosure

Method used

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  • Application for a radio frequency identification system
  • Application for a radio frequency identification system
  • Application for a radio frequency identification system

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0057] Combination labels are manufactured in accordance with the present invention. A Permal magnetic strip made of an alloy sold under the designation "HyMu80" by Carpenter Technology Corporation of Reading, PA was attached to a test device manufactured by Single Chip Systems (SCS) of San Diego, CA ( fixture). The magnetic strip tested was approximately 1.6 mm (0.625 inches) wide, 0.0254 mm (0.001 inches) thick, and 10.16 cm (4 inches) long. The test equipment consisted of a standard SCS 2.45GHz antenna connected to a LED diode. The device is designed so that when exposed to a 2.45 GHz field of sufficient strength to power a typical SCS RFID tag, the LED will illuminate, providing immediate visual confirmation of proper operation of the power receiving portion of the device. When the standard SCS antenna was replaced by the prototype permalloy antenna, the LED illuminated with approximately the same field strength, confirming successful operation of the prototype.

example 2

[0059] image 3 Another embodiment of an antenna that is believed to be designed for RFID at 13.56 MHz is shown. At this frequency, a coil-type antenna geometry is preferred. The helical turns comprising coils are formed from a magnetic alloy such as permalloy by etching (physical or chemical), die dicing or deposition through a mask. In this design, the straight "arm" portion of the coil also serves as the magnetically responsive element. However, the reduced length of the metallic elements in this geometry limits the effectiveness of the magnetically secure portion of the device. exist image 3 In the embodiment shown, flux collecting elements provided at the corners have been added to the antenna coils to overcome this limitation. image 3 The structure shown preferably includes capacitors as previously described to tune the operating frequency of the antenna to the designated interrogation frequency.

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PUM

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Abstract

Antenna shelf tape(310)is disclosed for use with items(1-26)having radio frequency identification elements or tags associated with items of interest.

Description

[0001] reference [0002] This application claims priority to US Application Serial No. 09 / 134,686 filed August 14, 1998 in the same title, which application is assigned to the assignee of the present invention, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to the use of radio frequency identification (RFID) systems, and more particularly to the use of such systems in libraries. Background technique [0004] Electronic Article Surveillance ("EAS") systems that detect the presence of electronic devices on or in an item or carried by persons of interest are often used in retail or library environments to prevent theft or other unauthorized removal of items . These devices are known as tags or markers and in the past they only contained information about the presence or absence of an item. This information can be obtained by electronically interrogating the tag either intermittently or continuously. Over th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65G61/00G06K7/10G06K17/00G06K19/07G06K19/077G08B13/22G08B13/24H01Q1/22H01Q1/38H01Q7/00
CPCH01Q7/00H01Q1/2208H01Q1/22G06K7/10079G06K19/07783H01Q1/2225G06K19/07749G06K19/07767G06K19/07786G06K19/07779G06K7/10346G06K2017/0045G01V15/00
Inventor E·D·戈夫B·A·冈萨雷斯C·彼得罗夫斯基蔡庆隆
Owner 3M INNOVATIVE PROPERTIES CO