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Surface acoustic wave identification and methods of operation and manufacture thereof

A technology for identifying tags and surface acoustic waves, which can be used in instruments, calculations, impedance networks, etc., and can solve problems such as expensive

Inactive Publication Date: 2009-03-11
RF SAW COMPONENTS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coreless labels generally have about the same read range as barcodes or magnetic stripes and, therefore, share the same major drawbacks
State-of-the-art RFID chip tags can be manufactured to have significantly longer reliable read ranges than coreless tags, magnetic stripes, or barcodes, but they are often so expensive that their use is limited to economically justifiable costs individual applications of

Method used

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  • Surface acoustic wave identification and methods of operation and manufacture thereof
  • Surface acoustic wave identification and methods of operation and manufacture thereof
  • Surface acoustic wave identification and methods of operation and manufacture thereof

Examples

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Embodiment Construction

[0018] Referring first to FIG. 1, there is shown the upper surface of an embodiment of a SAW identification tag 100 utilizing an encoding transducer 110 constructed in accordance with the present invention. The illustrated SAW tag 100 has a piezoelectric substrate 120 with a plurality of reflectors 130 distributed between a set 140 of slots 145 . Grooves 145 are placed on said substrate 120 in both pulse and phase positions, and reflectors 130 are located in these grooves 145, thereby encoding numbers in terms of such pulse and phase positions.

[0019] As understood by those of ordinary skill in the relevant art, SAW tag 100 is a passive device that responds to external stimuli. The stimulus is generated by an associated reader (not shown), which emits an interrogation signal that is received by transducer 110 as electrical pulses. The transducer 110 converts the electrical pulses into SAW interrogation pulses that propagate along the surface of the substrate 120 . Each tim...

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PUM

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Abstract

A surface acoustic wave (SAW) identification tag with an encoded transducer and methods of operating and manufacturing the same. In one embodiment, the tag comprises: (1) a piezoelectric substrate having a plurality of reflectors distributed in a set of grooves arranged on the substrate in both pulse position and phase position so that the phase position encodes a number; and (2) a SAW transducer on said substrate for generating encoded interrogation pulses.

Description

technical field [0001] The present invention relates generally to a Surface Acoustic Wave (SAW) identification tag and, more particularly, to an interdigital transducer on a SAW tag configured for an identification code and methods of operation and manufacture thereof. Background technique [0002] Today, a large number of different types of electronic identification devices are attached to items for identification of such items. The variety of devices used ranges from the ubiquitous bar codes and magnetic stripes, to the much more sophisticated radio frequency identification (RFID) devices. In the case of barcodes and magnetic stripes, notable limiting factors include line-of-sight reliability, label damage and surface dust issues, and relatively short effective ranges. For example, magnetic stripes generally require that a reader be directly accessible and properly positioned on the magnetic stripe to detect and decode the data. In those rare cases where the magnetic str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/08G06K19/067H03H9/64
CPCG06K19/067H03H9/6406G06K19/0675Y10T29/42G06K19/07G06K19/077
Inventor 克林顿·S·哈特曼
Owner RF SAW COMPONENTS INC